1
|
Le P, Mills EHL, Weisenbach CA, Davis KG. Neck Muscle Coactivation Response to Varied Levels of Mental Workload During Simulated Flight Tasks. HUMAN FACTORS 2024; 66:2041-2056. [PMID: 37942623 DOI: 10.1177/00187208231206324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
OBJECTIVE To evaluate neck muscle coactivation across different levels of mental workload during simulated flight tasks. BACKGROUND Neck pain (NP) is highly prevalent among military aviators. Given the complex nature within the flight environment, mental workload may be a risk factor for NP. This may induce higher levels of neck muscle coactivity, which over time may accelerate fatigue, increase neck discomfort, and affect flight task performance. METHOD Three counterbalanced mental workload conditions represented by simulated flight tasks modulated by interstimulus frequency and complexity were investigated using the Modifiable Multitasking Environment (ModME). The primary measure was a neck coactivation index to describe the neuromuscular effort of the neck muscles as a system. Additional measures included perceived workload (NASA TLX), subjective discomfort, and task performance. Participants (n = 60; 30M, 30F) performed three test conditions over 1 hr each while seated in a simulated seating environment. RESULTS Neck coactivation indices (CoA) and subjective neck discomfort corresponded with increasing level of mental workload. Average CoAs for low, medium, and high workloads were: .0278(SD = .0232), .0286(SD = .0231), and .0295(SD = .0228), respectively. NASA TLX mental, temporal, effort, and overall scores also increased with the level of mental workload assigned. For ModME task performance, the overall performance score, monitoring accuracy, and resource management accuracy decreased while reaction times increased with the increasing level of mental workload. Communication accuracy was lowest with the low mental workload but had higher reaction times relative to increasing workload. CONCLUSION Mental workload affects neck muscle coactivation during combinations of simulated flight tasks within a simulated helicopter seating environment. APPLICATION The results of this study provide insights into the physical response to mental workload. With increasing multisensory modalities within the work environment, these insights may assist the consideration of physical effects from cognitive factors.
Collapse
Affiliation(s)
- Peter Le
- Air Force Research Laboratory, Wright-Patterson AFB, OH, USA
- Naval Medical Research Unit Dayton, Wright-Patterson AFB, OH, USA
| | - Emily H L Mills
- Naval Medical Research Unit Dayton, Wright-Patterson AFB, OH, USA
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA
- Design Interactive, Orlando, FL, USA
| | - Charles A Weisenbach
- Naval Medical Research Unit Dayton, Wright-Patterson AFB, OH, USA
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA
| | | |
Collapse
|
2
|
Campbell RG, Douglas RG, Zadro J, Gamble A, Chan CL, Mackey MG, Pappas E. Don't Just Stand There. Rethinking the Ideal Body Posture for Otorhinolaryngologists. Ann Otol Rhinol Laryngol 2024; 133:355-362. [PMID: 38044532 DOI: 10.1177/00034894231214035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Surgeons have a high rate of work-related musculoskeletal injuries; an area that has received little attention. These injuries result in surgeons performing less efficiently, needing to take time off work, suffering higher rates of burnout, and may ultimately lead surgeons to retire earlier than planned. Otorhinolaryngologists are at particular risk for work-related musculoskeletal injuries. Beyond the clinician, sustaining such injuries can negatively impact patient safety. Ergonomic interventions have been used effectively to reduce work-related musculoskeletal injuries in other professions, yet not in surgery. With traditional teachings of ideal body postures to avoid injury and manual handling training being re-evaluated, it is important to explore evidence based interventions for reducing work-related musculoskeletal injuries in otorhinolaryngologists. New research encourages us to shift the focus away from the traditional one-size-fits-all approach to ergonomics and toward postural recommendations and education that promote a dynamic, individualized approach to avoiding sustained, static and awkward postures.
Collapse
Affiliation(s)
- Raewyn G Campbell
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie Park, NSW, Australia
| | - Richard G Douglas
- Faculty of Medical and Health Sciences, Surgery, University of Auckland, Auckland, New Zealand
| | - Joshua Zadro
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
| | - Andrew Gamble
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
| | - Cliffton L Chan
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie Park, NSW, Australia
| | - Martin G Mackey
- Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia
| | - Evangelos Pappas
- Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW, Australia
| |
Collapse
|
3
|
Aldabbas MM, Tanwar T, Iram I, Salman M, Veqar Z. A comparison of nocturnal upper trapezius muscle activity between chronic neck pain patients with sleep disturbance and healthy participants. Sleep Breath 2024; 28:95-102. [PMID: 37421519 DOI: 10.1007/s11325-023-02867-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 05/05/2023] [Accepted: 06/02/2023] [Indexed: 07/10/2023]
Abstract
BACKGROUND Sleep disturbances frequently occur in patients with chronic neck pain. In these patients, upper trapezius muscle dysfunction is observed during sleep. This study aimed to evaluate the trapezius muscle activity during sleep among patients with chronic neck pain and sleep disturbances for comparison with healthy subjects. STUDY DESIGN: Cross-sectional study. METHODS Patients with chronic neck pain and healthy subjects participated in the study. Two overnight polysomnography recordings were conducted for each subject. Surface electromyography was utilized to record the nocturnal activity of the right and left upper trapezius muscles throughout the night. The nocturnal upper trapezius activity recording was divided into the following parts: wakefulness, rapid eye movement sleep (REM), and non-rapid eye movement sleep (NREM). The nocturnal activity during NREM sleep was further divided into three parts (stage I NREM sleep, stage II NREM, and stage III NREM. Normalization of EMG signals was performed. The normalized value of nocturnal activity was derived for analysis. RESULTS Among 15 patients with chronic neck pain and 15 healthy subjects, statistically significant differences were observed in the nocturnal activity of the upper trapezius. Compared to healthy subjects, the nocturnal activity of the upper trapezius was significantly higher during wakefulness, REM sleep, and NREM II and III sleep in patients with chronic neck pain and sleep disturbances. CONCLUSION There was higher nocturnal upper trapezius activity in patients with chronic neck pain compared to healthy controls. The findings suggest a possible pathophysiological mechanism that may relate to chronic neck pain. TRIAL REGISTRATION CTRI/2019/09/021028.
Collapse
Affiliation(s)
- Mosab M Aldabbas
- Centre for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia Central University, New Delhi, India
| | - Tarushi Tanwar
- Centre for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia Central University, New Delhi, India
| | - Iram Iram
- Centre for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia Central University, New Delhi, India
| | - Mohammad Salman
- Deen Dayal Upadhyaya Kaushal Kendra, Jamia Millia Islamia Central University, New Delhi, India
| | - Zubia Veqar
- Centre for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia Central University, New Delhi, India.
| |
Collapse
|
4
|
Kim D, Nicoletti C, Soedirdjo SDH, Baghi R, Garcia MG, Läubli T, Wild P, Botter A, Martin BJ. Effect of Periodic Voluntary Interventions on Trapezius Activation and Fatigue During Light Upper Limb Activity. HUMAN FACTORS 2023; 65:1491-1505. [PMID: 34875887 DOI: 10.1177/00187208211050723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
OBJECTIVE The effects of diverse periodic interventions on trapezius muscle fatigue and activity during a full day of computer work were investigated. BACKGROUND Musculoskeletal disorders, including trapezius myalgia, may be associated with repeated exposure to prolonged low-level activity, even during light upper-extremity tasks including computer work. METHODS Thirty healthy adults participated in a study that simulated two 6-hour workdays of computer work. One workday involved imposed periodic passive and active interventions aimed at disrupting trapezius contraction monotony (Intervention day), whereas the other workday did not (Control day). Trapezius muscle activity was quantified by the 3-dimensional acceleration of the jolt movement of the acromion produced by electrically induced muscle twitches. The spatio-temporal distribution of trapezius activity was measured through high-density surface electromyography (HD-EMG). RESULTS The twitch acceleration magnitude in one direction was significantly different across measurement periods (p = 0.0156) on Control day, whereas no significant differences in any direction were observed (p > 0.05) on Intervention day. The HD-EMG from Intervention day showed that only significant voluntary muscle contractions (swing arms, Jacobson maneuver) induced a decrease in the muscle activation time and an increase in the spatial muscle activation areas (p < 0.01). CONCLUSION Disruption of trapezius monotonous activity via brief voluntary contractions effectively modified the ensuing contraction pattern (twitch acceleration along one axis, active epochs reduction, and larger spatial distribution). The observed changes support an associated reduction of muscle fatigue. APPLICATION This study suggests that disruptive intervention activity is efficient in reducing the impact of trapezius muscle fatigue.
Collapse
Affiliation(s)
| | - Corine Nicoletti
- Department of Health Sciences and Technology, Institute of Robotics and Intelligent Systems, ETH Zurich, Zurich, Switzerland
- Institute of Health Sciences, Zurich University of Applied Sciences, Winterthur, Switzerland
| | - Subaryani D H Soedirdjo
- Laboratory for Engineering of the Neuromuscular System (LISiN), Department of Electronics and Telecommunications, Politecnico di, Torino, Turin, Italy
- Department of Physical Medicine and Rehabilitation, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Raziyeh Baghi
- Department of Physical Therapy and Rehabilitation Science, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Maria-Gabriela Garcia
- Department of Health Sciences and Technology, Institute of Robotics and Intelligent Systems, ETH Zurich, Zurich, Switzerland
- Department of Industrial Engineering, School of Engineering, Universidad San Francisco de Quito, Quito, Ecuador
| | - Thomas Läubli
- Department of Health Sciences and Technology, Institute of Robotics and Intelligent Systems, ETH Zurich, Zurich, Switzerland
- Institute of Occupational and Social Medicine and Health Services Research, University of Tübingen, Tübingen, Germany
| | - Pascal Wild
- French National Research and Safety Institute (INRS), Vandœuvre lès Nancy, France
| | - Alberto Botter
- Laboratory for Engineering of the Neuromuscular System (LISiN), Department of Electronics and Telecommunications, Politecnico di, Torino, Turin, Italy
| | - Bernard J Martin
- Department of Health Sciences and Technology, Institute of Robotics and Intelligent Systems, ETH Zurich, Zurich, Switzerland
- Department of Industrial and Operations Engineering, School of Engineering, University of Michigan, Ann Arbor, MI, USA
| |
Collapse
|
5
|
Kolbe O, Becker P, Degle S, Anders C. Trapezius activity during personal computer work with progressive addition lenses for general purpose and for computer work in neophytes. Ophthalmic Physiol Opt 2023; 43:1391-1405. [PMID: 37417310 DOI: 10.1111/opo.13196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 06/12/2023] [Accepted: 06/14/2023] [Indexed: 07/08/2023]
Abstract
INTRODUCTION This study analysed the impact of general purpose progressive addition lenses (GP-PALs) and computer progressive addition lenses (PC-PALs) on the activity of the trapezius muscle during computer operation. METHODS In this randomised, single-blinded, crossover study, surface electromyography (SEMG) signals were recorded bilaterally from the trapezius muscle during a 30-min computer task performed wearing different presbyopic corrections. The amplitude probability distribution function and its percentiles, gap frequency, muscular rest time and sustained low-level muscle activity periods were analysed in 32 subjects with artificially induced presbyopia. Subjectively perceived differences in vision and postural load between lenses were evaluated using a seven-item questionnaire (non-standardised, visual analogue scale ranged from 1 [bad] to 100 [good]). RESULTS Considering the SEMG data, no significant difference in the muscular activity of the trapezius muscle was observed when using GP-PALs or PC-PALs for computer operation. However, PC-PALs showed statistically and clinically significantly higher results for subjectively perceived visual quality (78.4-31.3; p < 0.001), spontaneous tolerance (79.2-31.3; p < 0.001) and field of view (75.9-23.5; p < 0.001) compared with GP-PALs. CONCLUSIONS Even though the electromyographic approach did not show a significant differentiation between the lenses, the subjective evaluation was clearly in favour of PC-PALs. Eye care practitioners should always take an occupational history of presbyopes, ask about the workplace situation and consider the use of PC-PALs.
Collapse
Affiliation(s)
- Oliver Kolbe
- Department of Optometry and Vision Sciences, Faculty of SciTec, Ernst-Abbe-University of Applied Sciences Jena, Jena, Germany
| | - Patrick Becker
- Department of Optometry and Vision Sciences, Faculty of SciTec, Ernst-Abbe-University of Applied Sciences Jena, Jena, Germany
| | - Stephan Degle
- Department of Optometry and Vision Sciences, Faculty of SciTec, Ernst-Abbe-University of Applied Sciences Jena, Jena, Germany
| | - Christoph Anders
- Division of Motor Research, Jena University Hospital, Jena, Germany
| |
Collapse
|
6
|
Le P, Weisenbach CA, Mills EHL, Monforton L, Kinney MJ. Exploring the Interaction Between Head-Supported Mass, Posture, and Visual Stress on Neck Muscle Activation. HUMAN FACTORS 2023; 65:365-381. [PMID: 34078152 DOI: 10.1177/00187208211019154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
OBJECTIVE Assess neck muscle activity for varying interactions between helmet, posture, and visual stress in a simulated "helo-hunch" posture. BACKGROUND Military aviators frequently report neck pain (NP). Risk factors for NP include head-supported mass, awkward postures, and mental workload. Interactions between these factors could induce constant low-level muscle activation during helicopter flight and better explain instances of NP. METHOD Interactions between physical loading (helmet doffed/donned), posture (symmetric/asymmetric), and visual stress (low/high contrast) were studied through neck muscle electromyography (EMG), head kinematics, subjective discomfort, perceived workload, and task performance. Subjects (n = 16) performed eight 30-min test conditions (varied physical loading, posture, and visual stress) while performing a simple task in a simulated "helo-hunch" seating environment. RESULTS Conditions with a helmet donned had fewer EMG median frequency cycles (which infer motor unit rotation for rest/recovery, where more cycles are better) in the left cervical extensor and left sternocleidomastoid. Asymmetric posture (to the right) resulted in higher normalized EMG activity in the right cervical extensor and left sternocleidomastoid and resulted in less lateral bending compared with neutral across all conditions. Conditions with high visual stress also resulted in fewer EMG cycles in the right cervical extensor. CONCLUSION A complex interaction exists between the physical load of the helmet, postural stress from awkward postures, and visual stress within a simulated "helo-hunch" seating environment. APPLICATION These results provide insight into how visual factors influence biomechanical loading. Such insights may assist future studies in designing short-term administrative controls and long-term engineering controls.
Collapse
Affiliation(s)
- Peter Le
- Naval Medical Research Unit Dayton, Ohio, USA
| | - Charles A Weisenbach
- Naval Medical Research Unit Dayton, Ohio, USA
- Oak Ridge Institute for Science and Education, Tennessee, USA
| | - Emily H L Mills
- Naval Medical Research Unit Dayton, Ohio, USA
- Oak Ridge Institute for Science and Education, Tennessee, USA
| | - Lanie Monforton
- Naval Medical Research Unit Dayton, Ohio, USA
- Parsons Corporation, Centerville, Virginia, USA
| | | |
Collapse
|
7
|
Luger T, Bonsch R, Seibt R, Krämer B, Rieger MA, Steinhilber B. Intraoperative active and passive breaks during minimally invasive surgery influence upper extremity physical strain and physical stress response-A controlled, randomized cross-over, laboratory trial. Surg Endosc 2023:10.1007/s00464-023-10042-9. [PMID: 37084097 PMCID: PMC10120511 DOI: 10.1007/s00464-023-10042-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 03/25/2023] [Indexed: 04/22/2023]
Abstract
OBJECTIVE Investigate the effect of passive, active or no intra-operative work breaks on static, median and peak muscular activity, muscular fatigue, upper body postures, heart rate, and heart rate variability. BACKGROUND Although laparoscopic surgery is preferred over open surgery for the benefit of the patient, it puts the surgeons at higher risk for developing musculoskeletal disorders especially due to the less dynamic and awkward working posture. The organizational intervention intraoperative work break is a workplace strategy that has previously demonstrated positive effects in small-scale intervention studies. METHODS Twenty-one surgeons were exposed to three 90-min conditions: no breaks, 2.5-min passive (standing rest) or active (targeted stretching and mobilization exercises) breaks after 30-min work blocks. Muscular activity and fatigue of back, shoulder and forearm muscles were assessed by surface electromyography; upper body posture, i.e., spinal curvature, by inclination sensors; and heart rate and variability (HRV) by electrocardiography. Generalized estimating equations were used for statistical analyses. This study (NCT03715816) was conducted from March 2019 to October 2020. RESULTS The HRV-metric SDNN tended to be higher, but not statistically significantly, in the intervention conditions compared to the control condition. No statistically significant effects of both interventions were detected for muscular activity, joint angles or heart rate. CONCLUSION Intraoperative work breaks, whether passive or active, may counteract shoulder muscular fatigue and increase heart rate variability. This tendency may play a role in a reduced risk for developing work-related musculoskeletal disorders and acute physical stress responses.
Collapse
Affiliation(s)
- Tessy Luger
- Institute of Occupational and Social Medicine and Health Services Research, Eberhard Karls University and University Hospital Tübingen, Wilhelmstraße 27, 72074, Tübingen, Germany.
| | - Rosina Bonsch
- Institute of Occupational and Social Medicine and Health Services Research, Eberhard Karls University and University Hospital Tübingen, Wilhelmstraße 27, 72074, Tübingen, Germany
- Plastic, Reconstructive and Burn Surgery, Clinic for Hand, BG Clinic Tübingen, Schnarrenbergstraße 95, 72076, Tübingen, Germany
| | - Robert Seibt
- Institute of Occupational and Social Medicine and Health Services Research, Eberhard Karls University and University Hospital Tübingen, Wilhelmstraße 27, 72074, Tübingen, Germany
| | - Bernhard Krämer
- Department of Gynecology and Obstetrics, University Hospital Tübingen, Calwerstraße 7, 72076, Tübingen, Germany
| | - Monika A Rieger
- Institute of Occupational and Social Medicine and Health Services Research, Eberhard Karls University and University Hospital Tübingen, Wilhelmstraße 27, 72074, Tübingen, Germany
| | - Benjamin Steinhilber
- Institute of Occupational and Social Medicine and Health Services Research, Eberhard Karls University and University Hospital Tübingen, Wilhelmstraße 27, 72074, Tübingen, Germany
| |
Collapse
|
8
|
Moyen-Sylvestre B, Goubault É, Begon M, Côté JN, Bouffard J, Dal Maso F. Power Spectrum of Acceleration and Angular Velocity Signals as Indicators of Muscle Fatigue during Upper Limb Low-Load Repetitive Tasks. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22208008. [PMID: 36298357 PMCID: PMC9608815 DOI: 10.3390/s22208008] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 10/06/2022] [Accepted: 10/14/2022] [Indexed: 06/01/2023]
Abstract
Muscle fatigue is a risk factor for developing musculoskeletal disorders during low-load repetitive tasks. The objective of this study was to assess the effect of muscle fatigue on power spectrum changes of upper limb and trunk acceleration and angular velocity during a repetitive pointing task (RPT) and a work task. Twenty-four participants equipped with 11 inertial measurement units, that include acceleration and gyroscope sensors, performed a tea bag filling work task before and immediately after a fatiguing RPT. During the RPT, the power spectrum of acceleration and angular velocity increased in the movement and in 6-12 Hz frequency bands for sensors positioned on the head, sternum, and pelvis. Alternatively, for the sensor positioned on the hand, the power spectrum of acceleration and angular velocity decreased in the movement frequency band. During the work task, following the performance of the fatiguing RPT, the power spectrum of acceleration and angular velocity increased in the movement frequency band for sensors positioned on the head, sternum, pelvis, and arm. Interestingly, for both the RPT and work task, Cohens' d effect sizes were systematically larger for results extracted from angular velocity than acceleration. Although fatigue-related changes were task-specific between the RPT and the work task, fatigue systematically increased the power spectrum in the movement frequency band for the head, sternum, pelvis, which highlights the relevance of this indicator for assessing fatigue. Angular velocity may be more efficient to assess fatigue than acceleration. The use of low cost, wearable, and uncalibrated sensors, such as acceleration and gyroscope, in industrial settings is promising to assess muscle fatigue in workers assigned to upper limb repetitive tasks.
Collapse
Affiliation(s)
| | - Étienne Goubault
- School of Kinesiology and Physical Activity Science, Université de Montréal, Montreal, QC H3T 1J4, Canada
| | - Mickaël Begon
- Institute of Biomedical Engineering, Université de Montréal, Montreal, QC H3T 1J4, Canada
- School of Kinesiology and Physical Activity Science, Université de Montréal, Montreal, QC H3T 1J4, Canada
- Centre de Recherche du CHU Sainte-Justine, Montreal, QC H3T 1C5, Canada
| | - Julie N. Côté
- Department of Kinesiology and Physical Education, McGill University, Montreal, QC H3A 0G4, Canada
| | - Jason Bouffard
- Department of Kinesiology, Université Laval, Quebec, QC G1V 0A6, Canada
| | - Fabien Dal Maso
- School of Kinesiology and Physical Activity Science, Université de Montréal, Montreal, QC H3T 1J4, Canada
- Centre Interdisciplinaire de Recherche sur le Cerveau et l’Apprentissage, Montreal, QC H7N 0A5, Canada
| |
Collapse
|
9
|
Kolbe O, Bitterlich K, Lahne J, Degle S, Anders C. Surface Electromyography of the Trapezius and Sternocleidomastoid during Computer Work with Presbyopic Corrections. Optom Vis Sci 2022; 99:496-504. [PMID: 35412478 DOI: 10.1097/opx.0000000000001899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
SIGNIFICANCE During computer work in controlled laboratory conditions, wearing multifocal contact lenses (MFCLs) showed no lower muscle load but increased subjective perception of comfort with equivalent visual quality and comparable tolerance. PURPOSE Because musculoskeletal complaints are frequent among computer workers, this study used the muscle electrophysiological activity of shoulder and neck muscles in presbyopic computer workers who received either progressive addition lenses for general purpose (GP-PALs) or MFCLs. METHODS For this crossover study, 11 presbyopic computer workers aged 55 ± 4 years (mean ± standard deviation) were equipped with GP-PALs and MFCLs in a randomized order. Surface electromyography signals were recorded bilaterally from shoulder and neck muscles during short-term computer work tasks using an optimally adjusted visual display unit workplace. The amplitude probability distribution function, the number and total duration of EMG gaps, and sustained low-level muscle activity periods of the surface electromyography signals were calculated. Comfort and correction type preferences were assessed. Head inclination was objectively evaluated. RESULTS Multifocal contact lenses elicited no significant lower muscle load than GP-PALs. The number of sustained low-level muscle activity periods longer than 60 seconds was similar between visual aids. The total amount of gaps was significantly higher with MFCLs (44 gaps) compared with progressive addition lenses for general purpose (15 gaps) in all analyzed periods for all participants. However, there were no significant differences for the median in the intraindividual comparisons (P = .22, dz = 0.52). Multifocal contact lenses scored statistically significant higher in comfort values with equivalent visual quality and comparable tolerance (P = .003, dz = 1.51). CONCLUSIONS Although the study failed to show clear results, wearing MFCLs seems to enhance working comfort compared with GP-PALs subjectively.
Collapse
Affiliation(s)
- Oliver Kolbe
- Faculty of SciTec, Department of Optometry and Vision Sciences, Ernst-Abbe-University of Applied Sciences Jena, Jena, Germany
| | - Kathrin Bitterlich
- Faculty of SciTec, Department of Optometry and Vision Sciences, Ernst-Abbe-University of Applied Sciences Jena, Jena, Germany
| | - Johanna Lahne
- Faculty of SciTec, Department of Optometry and Vision Sciences, Ernst-Abbe-University of Applied Sciences Jena, Jena, Germany
| | - Stephan Degle
- Faculty of SciTec, Department of Optometry and Vision Sciences, Ernst-Abbe-University of Applied Sciences Jena, Jena, Germany
| | - Christoph Anders
- Division of Motor Research, Jena University Hospital, Jena, Germany
| |
Collapse
|
10
|
Shih P, Chu PC, Liu LW, Chen CY, Guo YL. Contributions of Ergonomics, Psychological Factors, and Sleep Disturbances to Lower Back Pain Among Taiwanese Workers. J Occup Environ Med 2021; 63:e596-e600. [PMID: 34117160 DOI: 10.1097/jom.0000000000002295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE We investigated the contributions of ergonomics, psychological factors, and sleep disturbances to lower back pain (LBP). METHODS A nationwide survey of sampled 27,508 (2.6‰) Taiwanese workers was conducted in 2010. Definition of outcome was LBP affecting work performance in the past year. Predictor variables included age, body mass index, ergonomic factors, job control, psychological demands, and sleep disturbances. Mutually adjusted relative risks were examined using general linear models, followed by aPAR. RESULTS 18,353 workers were included in the multivariate regression model. The three first significant risk factors to LBP included heavy lifting or awkward posture, sleep disturbances, and high psychological demands (aPAR = 13.5%, 8.7%, 5.7% respectively in men and 6.1%, 11.8%, 5.9% in women). CONCLUSIONS In addition to ergonomic exposure, sleep disturbances and high psychological demands significantly contributed to LBP.
Collapse
Affiliation(s)
- Ping Shih
- Department of Environmental and Occupational Medicine, National Taiwan University (NTU) College of Medicine and NTU Hospital, Taipei, Taiwan (Dr Shih, Dr Chu, and Dr Guo); Institute of Environmental and Occupational Health Sciences, National Taiwan University College of Public Health, Taipei, Taiwan (Dr Shih and Dr Guo); Institute of Labor, Occupational Safety and Health, Ministry of Labor, New Taipei City, Taiwan (Dr Liu and Dr Chen)
| | | | | | | | | |
Collapse
|
11
|
Cheung MC, Lai JSK, Yip J, Cheung JPY. Increased Computer Use is Associated with Trunk Asymmetry That Negatively Impacts Health-Related Quality of Life in Early Adolescents. Patient Prefer Adherence 2021; 15:2289-2302. [PMID: 34675493 PMCID: PMC8502057 DOI: 10.2147/ppa.s329635] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/14/2021] [Indexed: 11/30/2022] Open
Abstract
PURPOSE This study aimed to investigate the effects of trunk asymmetry on the health-related quality of life of early adolescents and to identify daily activities that were associated with trunk asymmetry in this cohort. METHODS This study included 200 early adolescents (52 male and 148 female) aged 10 to 14 years in Hong Kong. Among them, 100 adolescents were considered to have trunk asymmetry with angle of trunk rotation ≥5° and one or more physical signs on visual inspection. The 36-Item Short Form Health Survey was used to measure the eight scales under the physical and mental domains of the health-related quality of life. The adolescents reported their average daily durations spent (1) using a computer; (2) using a smartphone; (3) watching television, videos or DVDs; (4) doing homework; and (5) doing physical exercise. Independent samples t-tests, chi-square (χ 2) tests or Mann-Whitney U-tests were performed to compare the health-related quality of life and the average daily duration of daily activities between early adolescents with and without trunk asymmetry. Logistic regression was performed to investigate the odds ratios of daily activities for trunk asymmetry. RESULTS Compared with early adolescents without trunk asymmetry, those with trunk asymmetry had a lower health-related quality of life in some of the physical domains, namely, bodily pain and general health, and all mental domains, namely, vitality (energy/fatigue), social functioning, role limitation due to emotional problems and mental health (p < 0.05). Use of computer was found to be significantly associated with trunk asymmetry in early adolescents (OR = 1.63, 95% CI [1.23, 2.14]). CONCLUSION Our results indicate that increased computer use is associated with trunk asymmetry, which negatively impacts the health-related quality of life in early adolescents.
Collapse
Affiliation(s)
- Mei-Chun Cheung
- Department of Social Work, The Chinese University of Hong Kong, Hong Kong SAR, China
- Correspondence: Mei-Chun Cheung Department of Social Work, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, ChinaTel +852-39431862Fax +852-26035018 Email
| | - Janelle S K Lai
- Department of Social Work, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Joanne Yip
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong SAR, China
| | - Jason Pui Yin Cheung
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong SAR, China
| |
Collapse
|
12
|
Is sex a proxy for mechanical variables during an upper limb repetitive movement task? An investigation of the effects of sex and of anthropometric load on muscle fatigue. Biol Sex Differ 2020; 11:60. [PMID: 33126920 PMCID: PMC7596960 DOI: 10.1186/s13293-020-00336-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 10/14/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Women report more work-related pain and neck/shoulder musculoskeletal disorders than men. For the same absolute workload, due to lower strength, females generally work at a higher relative intensity, which could induce more fatigue. However, the arm's anthropometric load (AL) of men is higher. Therefore, simply lifting their arm could be more fatiguing. Sex as a variable is formed of many constructs, and analyses can become muddied by their differing responses to fatigue. No studies have considered AL, when comparing how fatigue affects men and women. The purpose was to determine if including the arm's AL in the statistical analysis would impact findings of sex-specific effects of shoulder fatigue on muscle EMG. METHODS Fifty-five (29m/26f) participants completed a repetitive pointing task (RPT) at shoulder height until they reported fatigue of 8+ on the BORG CR-10 scale. Muscle activities were measured using surface electrodes placed over the anterior deltoid (AD) and upper trapezius (UT) muscles. Muscle activity amplitude was quantified using root mean square (RMS). First- and last-minute data were used to assess change from no-fatigue (NF) to fatigue-terminal (FT) conditions. AL was calculated using sex-specific body parameter equations. General estimating equations (GEE) were used to determine the effects of sex and fatigue on RMS values, while including AL in the GEE. RESULTS There was no sex difference in time to reach fatigue. A significant main effect of sex on RMS was observed (χ2(1) = 4.17, p = 0.04) when including AL as a covariate. Females displayed a significantly higher percentage change in AD RMS from NF to FT, compared to males (p = 0.03), when AL was included in the GEE. No sex differences in UT were observed. CONCLUSIONS This sex difference emerged when AL was included as a covariate, suggesting that sex-associated anthropometric differences may contribute to sex differences in the fatigue response. Differences in the impact of AL on AD compared to UT could be explained by differences in their respective mechanical roles or muscle fiber content. Anthropometrics may be useful to include as covariates in future research to separate individual anthropometric differences from sex differences.
Collapse
|
13
|
Bláfoss R, Sundstrup E, Jakobsen MD, Brandt M, Bay H, Andersen LL. Physical workload and bodily fatigue after work: cross-sectional study among 5000 workers. Eur J Public Health 2020; 29:837-842. [PMID: 30982881 PMCID: PMC6761836 DOI: 10.1093/eurpub/ckz055] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background Persistent bodily fatigue after working days may indicate an imbalance between work demands and capacity of the workers. This study aimed to investigate associations between physical exposures at work and bodily fatigue after work. Methods Danish workers with physical work (N=5377) answered questions about various physical exposures during work and bodily fatigue after work in the 2010 round of the Danish Work Environment Cohort Study. Associations were modeled using binary logistic regression controlled for various confounders. Results Mean age among the younger (<50 years) and older (≥50 years) workers was 36 and 56 years, respectively. Younger and older workers exposed to various physical exposures (e.g. ‘bending/twisting the back’) for more than a quarter of the workday were more fatigued after work. An exposure–response relationship was observed between the number of physical exposures and bodily fatigue, with odds ratios (OR) for fatigue in the body among younger workers being 1.01 (95%CI 0.63–1.63), 1.59 (95%CI 1.01–2.50), 2.37 (95%CI 1.54–3.66) and 2.84 (95%CI 1.85–5.36) for 1, 2, 3 and ≥4 types of combined physical exposures, respectively. Correspondingly, for older workers, ORs were 1.95 (95%CI 1.09–3.51), 4.06 (95%CI 2.32–7.12), 4.10 (95%CI 2.28–7.37) and 4.90 (95%CI 2.72–8.82) for 1, 2, 3 and ≥4 exposures, respectively. Conclusion While some of the single factor exposures were associated with increased bodily fatigue, the most marked associations were found when summing the number of different exposures. These results indicate that workplaces should focus on the sum of combined physical exposures rather than focusing solely on single exposures.
Collapse
Affiliation(s)
- Rúni Bláfoss
- Musculoskeletal Disorders and Physical Workload, National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Emil Sundstrup
- Musculoskeletal Disorders and Physical Workload, National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Markus D Jakobsen
- Musculoskeletal Disorders and Physical Workload, National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Mikkel Brandt
- Musculoskeletal Disorders and Physical Workload, National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Hans Bay
- Musculoskeletal Disorders and Physical Workload, National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Lars L Andersen
- Musculoskeletal Disorders and Physical Workload, National Research Centre for the Working Environment, Copenhagen, Denmark.,Sport Sciences, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| |
Collapse
|
14
|
Effects of a workplace exercise program on physical capacity and lower back symptoms in hospital nursing assistants: a randomized controlled trial. Int Arch Occup Environ Health 2020; 94:275-284. [PMID: 32936370 DOI: 10.1007/s00420-020-01572-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 08/28/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE Considering the relevance of muscle strength for sustaining good musculoskeletal health among workers who perform physically demanding work, the aim of this study was to evaluate the effectiveness of a therapeutic exercise program on muscle strength and low back symptoms among hospital nursing assistants. METHODS One hundred and twenty-nine nursing assistants filled out a questionnaire on personal, occupational information and health status, which allowed the identification of workers able to exercise. Ninety participants were randomly allocated to an intervention and a reference group. The therapeutic exercise program (TEP) lasted 12 weeks and included warm-up, strengthening and stretching exercises. Muscle strength of trunk flexors and trunk extensors, hamstring flexibility, and low back symptoms were evaluated before and after the intervention period by two blinded assessors. The comparison between groups was carried out using Mann-Whitney and χ2 tests at a significance level of 0.05. RESULTS The average participation in the exercise program was 17.5 sessions. Results showed increased trunk flexors muscle strength (p = 0.002; effect size: 0.77), improved pressure pain threshold for dorsal longissimus (p = 0.001; effect size > 0.8), and reduced low back symptoms (p = 0.002; OR = 6.25). No differences between groups were identified for back extensor muscle strength or flexibility. CONCLUSION The exercise program applied is a feasible intervention which resulted clinically relevant results for nursing assistants' musculoskeletal health expressed through trunk flexors muscle strength improvement and low back symptoms control among nursing assistants. This RCT brings contribution to the Occupational Health field as the exercise program applied resulted in clinically relevant results for nursing assistants' musculoskeletal health. This study brings contribution especially for low-income and middle-income countries where low back pain and disability can be considered more severe as adequate resources to address the problem are scarce. Thus, we must highlight the importance of low-cost preventive strategies, like exercise programs carried out in hospital settings to avoid the progress of disability among active nursing personnel.
Collapse
|
15
|
Barbe MF, Popoff SN. Occupational Activities: Factors That Tip the Balance From Bone Accrual to Bone Loss. Exerc Sport Sci Rev 2020; 48:59-66. [PMID: 32004169 PMCID: PMC7077966 DOI: 10.1249/jes.0000000000000217] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bone adaptation to persistent overloading can be counteracted by superimposed inflammatory and loading-induced damage that can tip the balance from bone accrual to loss. Supplemental digital content is available in the text. It is commonly assumed that beneficial adaptations in bone occur with vigorous exercise, yet any adaptive re/modeling in bone undergoing persistent overloading can be counteracted by superimposed inflammatory, compressive, and tensile loading–induced damage responses above thresholds of tissue fatigue failure and repair. This leads to a tenuous balance between achieving bone accrual and loss.
Collapse
Affiliation(s)
- Mary F Barbe
- Department of Anatomy and Cell Biology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA
| | | |
Collapse
|
16
|
Electromyographic Evaluation of Specific Elastic Band Exercises Targeting Neck and Shoulder Muscle Activation. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10030756] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Background: Specific strength training at a high intensity is effective in reducing work related neck/shoulder pain. However, it remains to be documented as to which exercises most specifically target neck and shoulder muscles at high activation level while using simple equipment as e.g., elastic bands. We hypothezised that selected exercises would specifically target the respective muscles, as follows: (1) shrugs and reverse flyes: the upper trapezius muscle, (2) cervical extension and lateral flexion: the upper neck extensor muscle, and (3) cervical flexion and rotation: the sternocleidomastoideus muscle. Methods: Eleven healthy males (25.9 ± 1.4 years, BMI 24.3 ± 1.4) with no neck/shoulder pain (VAS = 0) performed the six exercises with elastic bands at 12RM (repetition maximum) and 20RM in a randomized order. Electromyography was bilaterally recorded from the three muscles and it was normalized to maximal voluntary activation (%MVE). Exercises that evoke more than 60%MVE were considered as high intensity activation. Results: High muscle activation level was attained during 12RM in the upper trapezius muscle during shrugs (100.3 ± 29.8%MVE) and reverse flyes (91.6 ± 32.8%MVE) and in the upper neck extensor muscle during cervical extension (67.6 ± 29.8%MVE) and shrugs (61.9 ± 16.8%MVE). In the sternocleidomastoideus muscle, the highest activity was recorded during cervical flexion (51.7 ± 16.4%MVE) but it did not exceed 60%MVE. The overall activity was ~10% higher during 12RM when compared to 20RM. Conclusion: The simple exercises shrugs and reverse flyes resulted in high intensity activation of both the upper trapezius and neck extensors, while no exercises activated sternocleidomastoideus at high intensity.
Collapse
|
17
|
Namwongsa S, Puntumetakul R, Neubert MS, Boucaut R. Effect of neck flexion angles on neck muscle activity among smartphone users with and without neck pain. ERGONOMICS 2019; 62:1524-1533. [PMID: 31451087 DOI: 10.1080/00140139.2019.1661525] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 06/25/2019] [Indexed: 06/10/2023]
Abstract
This study examined the differences in neck muscle activity at various neck flexion angles in smartphone users with and without neck pain. Forty-four participants performed texting tasks for 1 min and 30 s. Neck muscle activity and pain in the neck were measured at different neck flexion angles. There was a difference in neck muscle activity for each of the neck flexion angles; the Cervical Erector Spinae (CES) muscle activity increased while the Upper Trapezius (UT) muscle activity decreased when at increased neck flexion angles. At neck flexion angle of 0°-15°, the activity of both CES and UT muscles were acceptably low. Smartphone users with neck pain had slightly higher muscle activity levels than smartphone users without neck pain. In conclusion, smartphone users should consider adopting neck flexion angles between 0 and 15 degrees during smartphone use as there is an association between this neck flexion angle range and reduced CES muscle activity. Practitioner summary: This study demonstrated that both smartphone users with and without neck pain should try to keep their neck flexion angle between 0° and 15° when using their smartphone. This would reduce neck muscle activity and the risk of developing neck disorders associated with smartphone use.
Collapse
Affiliation(s)
- Suwalee Namwongsa
- Research Center in Back, Neck, Other Joint Pain and Human Performance (BNOJPH), Khon Kaen University , Khon Kaen , Thailand
- School of Physical Therapy, Faculty of Associated Medical Sciences, Khon Kaen University , Khon Kaen , Thailand
| | - Rungthip Puntumetakul
- Research Center in Back, Neck, Other Joint Pain and Human Performance (BNOJPH), Khon Kaen University , Khon Kaen , Thailand
- School of Physical Therapy, Faculty of Associated Medical Sciences, Khon Kaen University , Khon Kaen , Thailand
| | - Manida Swangnetr Neubert
- Research Center in Back, Neck, Other Joint Pain and Human Performance (BNOJPH), Khon Kaen University , Khon Kaen , Thailand
- Program of Production Technology, Faculty of Technology, Khon Kaen University , Khon Kaen , Thailand
| | - Rose Boucaut
- School of Health Sciences (Physiotherapy), iCAHE (International Centre for Allied Health Evidence), University of South Australia , Adelaide , Australia
| |
Collapse
|
18
|
Presbyopic Personal Computer Work: A Comparison of Progressive Addition Lenses for General Purpose and Personal Computer Work. Optom Vis Sci 2019; 95:1046-1053. [PMID: 30339644 DOI: 10.1097/opx.0000000000001295] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
SIGNIFICANCE Computer-specific progressive addition lenses (PC-PALs) are shown to reduce computer vision syndrome (CVS) symptoms, increase visual comfort and tolerance, and improve body posture at the personal computer. They are highly preferred by computer workers. Increasing their use may aid prevention measures within the workplace health management. PURPOSE This study investigates whether technical differences between general-purpose progressive addition lenses (GP-PALs) and PC-PALs are subjectively manifest in CVS. MATERIALS AND METHODS One hundred ninety presbyopic visual display unit (VDU) workers aged 53 ± 6 years (mean ± SD) were fitted with GP-PALs and PC-PALs in a subject-masked, randomized, crossover study. Subjects tested both corrections at their personal workplace for 2 weeks each, for VDU work only. Comfort and lens type preferences were assessed using a 24-item questionnaire developed for this study. RESULTS Computer vision syndrome was perceived approximately seven times more often with GP-PALs compared with PC-PALs. Eighty-four percent of subjects preferred PC-PALs for their VDU work. Computer-specific progressive addition lenses ratings were statistically and clinically significantly better than GP-PALs (5.95 vs. 4.42 of 7 points; 1.53; 95% confidence interval, 1.20 to 1.85). An existing ametropia or prior experience with PALs did not influence the score. Only 14.2% of subjects had received information about specific VDU eyewear from their optician or optometrist, whereas 79% expressed the wish to be informed about these products. CONCLUSIONS Computer-specific progressive addition lenses reduce the perception of the CVS and are highly preferred by VDU workers.
Collapse
|
19
|
Calcium Fluxes in Work-Related Muscle Disorder: Implications from a Rat Model. BIOMED RESEARCH INTERNATIONAL 2019; 2019:5040818. [PMID: 31662979 PMCID: PMC6791278 DOI: 10.1155/2019/5040818] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 08/13/2019] [Accepted: 08/20/2019] [Indexed: 01/16/2023]
Abstract
Introduction Ca2+ regulatory excitation-contraction coupling properties are key topics of interest in the development of work-related muscle myalgia and may constitute an underlying cause of muscle pain and loss of force generating capacity. Method A well-established rat model of high repetition high force (HRHF) work was used to investigate if such exposure leads to an increase in cytosolic Ca2+ concentration ([Ca2+]i) and changes in sarcoplasmic reticulum (SR) vesicle Ca2+ uptake and release rates. Result Six weeks exposure of rats to HRHF increased indicators of fatigue, pain behaviors, and [Ca2+]i, the latter implied by around 50-100% increases in pCam, as well as in the Ca2+ handling proteins RyR1 and Casq1 accompanied by an ∼10% increased SR Ca2+ uptake rate in extensor and flexor muscles compared to those of control rats. This demonstrated a work-related altered myocellular Ca2+ regulation, SR Ca2+ handling, and SR protein expression. Discussion These disturbances may mirror intracellular changes in early stages of human work-related myalgic muscle. Increased uptake of Ca2+ into the SR may reflect an early adaptation to avoid a sustained detrimental increase in [Ca2+]i similar to the previous findings of deteriorated Ca2+ regulation and impaired function in fatigued human muscle.
Collapse
|
20
|
Mista CA, Laugero SJ, Adur JF, Andersen OK, Biurrun Manresa JA. A new experimental model of muscle pain in humans based on short‐wave diathermy. Eur J Pain 2019; 23:1733-1742. [DOI: 10.1002/ejp.1449] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 06/24/2019] [Accepted: 06/26/2019] [Indexed: 12/27/2022]
Affiliation(s)
- Christian A. Mista
- Institute for Research and Development on Bioengineering and Bioinformatics (IBB) CONICET‐UNER Oro Verde Argentina
- Laboratory for Rehabilitation Engineering and Neuromuscular and Sensory Research (LIRINS) National University of Entre Ríos Oro Verde Argentina
| | - Silvio J. Laugero
- Department of Bioengineering National University of Entre Ríos Oro Verde Argentina
| | - Javier F. Adur
- Institute for Research and Development on Bioengineering and Bioinformatics (IBB) CONICET‐UNER Oro Verde Argentina
- Department of Bioengineering National University of Entre Ríos Oro Verde Argentina
| | - Ole K. Andersen
- Center for Neuroplasticity and Pain (CNAP), SMI®, Faculty of Medicine Aalborg University Aalborg Denmark
| | - José A. Biurrun Manresa
- Institute for Research and Development on Bioengineering and Bioinformatics (IBB) CONICET‐UNER Oro Verde Argentina
- Laboratory for Rehabilitation Engineering and Neuromuscular and Sensory Research (LIRINS) National University of Entre Ríos Oro Verde Argentina
- Center for Neuroplasticity and Pain (CNAP), SMI®, Faculty of Medicine Aalborg University Aalborg Denmark
| |
Collapse
|
21
|
Mork R, Falkenberg HK, Fostervold KI, Thorud HMS. Discomfort glare and psychological stress during computer work: subjective responses and associations between neck pain and trapezius muscle blood flow. Int Arch Occup Environ Health 2019; 93:29-42. [PMID: 31286223 DOI: 10.1007/s00420-019-01457-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 06/30/2019] [Indexed: 11/30/2022]
Abstract
PURPOSE Exposure to additional environmental stress during computer work, such as visual and psychological demands, is associated with increased eye and neck discomfort, altered moods, and reduced well-being. The aim of this study is to elucidate further how subjective responses in healthy, young females with normal binocular vision are affected by glare and psychological stress during computer work, and to investigate possible associations between trapezius muscle blood flow and neck pain development. METHODS 43 females participated in a laboratory experiment with a within-subject design. Four 10-min computer work conditions with exposure to different stressors were performed at an ergonomically optimal workstation, under the following series of conditions: no additional stress, visual stress (induced as direct glare from a large glare source), psychological stress, and combined visual and psychological stress. Before and immediately after each computer work condition, questionnaires regarding different visual and eye symptoms, neck and shoulder symptoms, positive and negative state moods, perceived task difficulty, and perceived ambient lighting were completed. Associations between neck pain and trapezius muscle blood flow were also investigated. RESULTS Exposure to direct glare induced greater development of visual/eye symptoms and discomfort, while psychological stress exposure made participants feel more negative and stressed. The perception of work lighting during glare exposure was closely related to perceived stress, and associations between visual discomfort and eyestrain, and neck pain were observed in all conditions. Furthermore, participants with high trapezius muscle blood flow overall reported more neck pain, independent of exposure. CONCLUSIONS Exposure to visual and psychological stresses during computer work affects the development of symptoms and negative moods in healthy, young females with normal binocular vision, but in different ways. The results also demonstrate the complex interactions involved in symptom development and lighting appraisal during computer work. When optimizing computer workstations, the complexity of the field must be taken into account, and several factors, including visual conditions, must be considered carefully.
Collapse
Affiliation(s)
- Randi Mork
- Department of Public Health Science, Norwegian University of Life Sciences, Ås, Norway.,Department of Optometry, Radiography and Lighting Design, National Centre for Optics, Vision and Eye Care, University of South-Eastern Norway, P.O. Box 235, Kongsberg, 3603, Norway
| | - Helle K Falkenberg
- Department of Optometry, Radiography and Lighting Design, National Centre for Optics, Vision and Eye Care, University of South-Eastern Norway, P.O. Box 235, Kongsberg, 3603, Norway
| | | | - Hanne-Mari Schiøtz Thorud
- Department of Optometry, Radiography and Lighting Design, National Centre for Optics, Vision and Eye Care, University of South-Eastern Norway, P.O. Box 235, Kongsberg, 3603, Norway.
| |
Collapse
|
22
|
de Melo Aquino B, da Silva Dos Santos DF, Jorge CO, Marques ACS, Teixeira JM, Parada CA, Oliveira-Fusaro MCG. P2X3 receptors contribute to muscle pain induced by static contraction by a mechanism dependent on neutrophil migration. Purinergic Signal 2019; 15:167-175. [PMID: 31115830 DOI: 10.1007/s11302-019-09659-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 05/13/2019] [Indexed: 01/02/2023] Open
Abstract
P2X3 receptors are involved with several pain conditions. Muscle pain induced by static contraction has an important socioeconomic impact. Here, we evaluated the involvement of P2X3 receptors on mechanical muscle hyperalgesia and neutrophil migration induced by static contraction in rats. Also, we evaluated whether static contraction would be able to increase muscle levels of TNF-α and IL-1β. Male Wistar rats were pretreated with the selective P2X3 receptor antagonist, A-317491, by intramuscular or intrathecal injection and the static contraction-induced mechanical muscle hyperalgesia was evaluated using the Randall-Selitto test. Neutrophil migration was evaluated by measurement of myeloperoxidase (MPO) kinetic-colorimetric assay and the cytokines TNF-α and IL-1β by enzyme-linked immunosorbent assay. Intramuscular or intrathecal pretreatment with A-317491 prevented static contraction-induced mechanical muscle hyperalgesia. In addition, A-317491 reduced static contraction-induced mechanical muscle hyperalgesia when administered 30 and 60 min of the beginning of static contraction, but not after 30 and 60 min of the end of static contraction. Intramuscular A-317491 also prevented static contraction-induced neutrophil migration. In a period of 24 h, static contraction did not increase muscle levels of TNF-α and IL-1β. These findings demonstrated that mechanical muscle hyperalgesia and neutrophil migration induced by static contraction are modulated by P2X3 receptors expressed on the gastrocnemius muscle and spinal cord dorsal horn. Also, we suggest that P2X3 receptors are important to the development but not to maintenance of muscle hyperalgesia. Therefore, P2X3 receptors can be pointed out as a target to musculoskeletal pain conditions induced by daily or work-related activities.
Collapse
Affiliation(s)
- Bruna de Melo Aquino
- Laboratory of Pain and Inflammation Research, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Diogo Francisco da Silva Dos Santos
- Laboratory of Pain and Inflammation Research, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Carolina Ocanha Jorge
- Laboratory of Pain and Inflammation Research, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Aline Carolina Salgado Marques
- Laboratory of Pain and Inflammation Research, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Juliana Maia Teixeira
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, Monteiro Lobato 255, Campinas, Sao Paulo, Brazil
| | - Carlos Amilcar Parada
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, Monteiro Lobato 255, Campinas, Sao Paulo, Brazil
| | | |
Collapse
|
23
|
Tassani S, Font-Llagunes JM, González Ballester MÁ, Noailly J. Muscular tension significantly affects stability in standing posture. Gait Posture 2019; 68:220-226. [PMID: 30517907 DOI: 10.1016/j.gaitpost.2018.11.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 09/06/2018] [Accepted: 11/27/2018] [Indexed: 02/02/2023]
Abstract
BACKGROUND Muscular co-contraction is a strategy commonly used by elders with the aim to increase stability. However, co-contraction leads to stiffness which in turns reduces stability. Some literature seems to suggest an opposite approach and to point out relaxation as a way to improve stability. Teaching relaxation is therefore becoming the aim of many studies letting unclear whether tension or relaxation are the most effective muscular strategy to improve stability. Relaxation is a misleading concept in our society. It is often confused with rest, while it should be addressed during stressing tasks, where it should aim to reduce energetic costs and increase stability. The inability to relax can be related to sub-optimal neuro-motor control, which can lead to increased stresses. RESEARCH QUESTION The objective of the study is to investigate the effect of voluntary muscle contraction and relaxation over the stability of human standing posture, answering two specific research questions: (1) Does the muscular tension have an impact on stability of standing posture? (2) Could this impact be estimated by using a minimally invasive procedure? METHODS By using a force plate, we analysed the displacement of the center of pressure of 30 volunteers during state of tension and relaxation in comparison with a control state, and with open and closed eyes. RESULTS We found that tension significantly reduced the stability of subjects (15 out of 16 parameters, p < 0.003). SIGNIFICANCE Our results show that daily situations of stress can lead to decreased stability. Such a loss might actually increase the risk of chronic joint overload or fall. Finally, breathing has direct effect over the management of pain and stress, and the results reported here point out the need to explicitly explore the troubling fact that a large portion of population might not be able to properly breath.
Collapse
Affiliation(s)
- Simone Tassani
- Universitat Pompeu Fabra, BCN MedTech, Barcelona, Spain.
| | - Josep M Font-Llagunes
- Universitat Politècnica de Catalunya, Biomechanical Engineering Lab, Department of Mechanical Engineering and Biomedical Engineering Research Centre, Barcelona, Spain; Institut de Recerca Sant Joan de Déu, Biomedical Engineering, Esplugues de Llobregat, Spain
| | | | | |
Collapse
|
24
|
MacDonald V, Keir PJ. Assessment of Musculoskeletal Disorder Risk with Hand and Syringe use in Chemotherapy Nurses and Pharmacy Assistants. IISE Trans Occup Ergon Hum Factors 2018. [DOI: 10.1080/24725838.2018.1502698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | - Peter J. Keir
- Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| |
Collapse
|
25
|
Aktürk S, Büyükavcı R, Aktürk Ü. Relationship between musculoskeletal disorders and physical inactivity in adolescents. J Public Health (Oxf) 2018. [DOI: 10.1007/s10389-018-0923-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
26
|
Barbe MF, Massicotte VS, Assari S, Monroy MA, Frara N, Harris MY, Amin M, King T, Cruz GE, Popoff SN. Prolonged high force high repetition pulling induces osteocyte apoptosis and trabecular bone loss in distal radius, while low force high repetition pulling induces bone anabolism. Bone 2018; 110:267-283. [PMID: 29476978 PMCID: PMC5878749 DOI: 10.1016/j.bone.2018.02.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 01/23/2018] [Accepted: 02/16/2018] [Indexed: 01/14/2023]
Abstract
We have an operant rat model of upper extremity reaching and grasping in which we examined the impact of performing a high force high repetition (High-ForceHR) versus a low force low repetition (Low-ForceHR) task for 18weeks on the radius and ulna, compared to age-matched controls. High-ForceHR rats performed at 4 reaches/min and 50% of their maximum voluntary pulling force for 2h/day, 3days/week. Low-ForceHR rats performed at 6% maximum voluntary pulling force. High-ForceHR rats showed decreased trabecular bone volume in the distal metaphyseal radius, decreased anabolic indices in this same bone region (e.g., decreased osteoblasts and bone formation rate), and increased catabolic indices (e.g., microcracks, increased osteocyte apoptosis, secreted sclerostin, RANKL, and osteoclast numbers), compared to controls. Distal metaphyseal trabeculae in the ulna of High-ForceHR rats showed a non-significant decrease in bone volume, some catabolic indices (e.g., decreased trabecular numbers) yet also some anabolic indices (e.g., increased osteoblasts and trabecular thickness). In contrast, the mid-diaphyseal region of High-ForceHR rats' radial and ulnar bones showed few to no microarchitecture differences and no changes in apoptosis, sclerostin or RANKL levels, compared to controls. In further contrast, Low-ForceHR rats showed increased trabecular bone volume in the radius in the distal metaphysis and increased cortical bone area its mid-diaphysis. These changes were accompanied by increased anabolic indices, no microcracks or osteocyte apoptosis, and decreased RANKL in each region, compared to controls. Ulnar bones of Low-ForceHR rats also showed increased anabolic indices, although fewer than in the adjacent radius. Thus, prolonged performance of an upper extremity reaching and grasping task is loading-, region-, and bone-dependent, with high force loads at high repetition rates inducing region-specific increases in bone degradative changes that were most prominent in distal radial trabeculae, while low force task loads at high repetition rates induced adaptive bone responses.
Collapse
Affiliation(s)
- Mary F Barbe
- Lewis Katz School of Medicine at Temple University, Department of Anatomy and Cell Biology, Philadelphia, PA 19140, United States.
| | - Vicky S Massicotte
- Lewis Katz School of Medicine at Temple University, Department of Anatomy and Cell Biology, Philadelphia, PA 19140, United States
| | - Soroush Assari
- Temple University College of Engineering, Department of Mechanical Engineering, Philadelphia, PA 19122, United States
| | - M Alexandra Monroy
- Perelman School of Medicine, University of Pennsylvania, Department of Radiation Oncology, Philadelphia, PA 19104, United States
| | - Nagat Frara
- Lewis Katz School of Medicine at Temple University, Department of Anatomy and Cell Biology, Philadelphia, PA 19140, United States
| | - Michele Y Harris
- Lewis Katz School of Medicine at Temple University, Department of Anatomy and Cell Biology, Philadelphia, PA 19140, United States
| | - Mamta Amin
- Lewis Katz School of Medicine at Temple University, Department of Anatomy and Cell Biology, Philadelphia, PA 19140, United States
| | - Tamara King
- College of Osteopathic Medicine, Department of Biomedical Sciences, Biddeford, ME 04005, United States
| | - Geneva E Cruz
- Lewis Katz School of Medicine at Temple University, Department of Anatomy and Cell Biology, Philadelphia, PA 19140, United States
| | - Steve N Popoff
- Lewis Katz School of Medicine at Temple University, Department of Anatomy and Cell Biology, Philadelphia, PA 19140, United States
| |
Collapse
|
27
|
Bouffard J, Yang C, Begon M, Côté J. Sex differences in kinematic adaptations to muscle fatigue induced by repetitive upper limb movements. Biol Sex Differ 2018; 9:17. [PMID: 29673397 PMCID: PMC5907702 DOI: 10.1186/s13293-018-0175-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Accepted: 04/06/2018] [Indexed: 11/10/2022] Open
Abstract
Background Muscle fatigue induced by repetitive movements contributes to the development of musculoskeletal disorders. Men and women respond differently to muscle fatigue during isometric single-joint efforts, but sex differences during dynamic multi-joint tasks have not been clearly identified. Moreover, most studies comparing men and women during fatigue development assessed endurance time. However, none evaluated sex differences in kinematic adaptations to fatigue during multi-joint dynamic tasks. The objective of the study was to compare how men and women adapt their upper body kinematics during a fatiguing repetitive pointing task. Methods Forty men and 41 women performed repetitive pointing movements (one per second) between two targets while maintaining their elbow elevated at shoulder height. The task ended when participants rated a perceived level of fatigue of 8/10. Trunk, humerothoracic, and elbow angles were compared between the first and last 30 s of the experiment and between men and women. Linear positions of the index finger (distance from the target) and the elbow (arm elevation) as well as movement timing were documented as task performance measures. Results Men (7.4 ± 3.2 min) and women (8.3 ± 4.5 min) performed the repetitive pointing task for a similar duration. For both sex groups, trunk range of motion increased with fatigue while shoulder’s and elbow’s decreased. Moreover, participants modified their trunk posture to compensate for the decreased humerothoracic elevation. Movements at all joints also became more variable with fatigue. However, of the 24 joint angle variables assessed, only two Sex × Fatigue interactions were observed. Although average humerothoracic elevation angle decreased in both subgroups, this decrease was greater in men (standardized response mean [SRM] − 1.63) than in women (SRM − 1.44). Moreover, the movement-to-movement variability of humerothoracic elevation angle increased only in women (SRM 0.42). Conclusion Despite many similarities between men’s and women’s response to fatigue induced by repetitive pointing movements, some sex differences were observed. Those subtle differences may indicate that men’s shoulder muscles were more fatigued than women’s despite a similar level of perceived exertion. They may also indicate that men and women do not adapt the exact same way to a similar fatigue. Electronic supplementary material The online version of this article (10.1186/s13293-018-0175-9) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Jason Bouffard
- Department of Kinesiology and Physical Education, McGill University, Montreal, H2W 1S4, Qc, Canada. .,Occupational Biomechanics and Ergonomics Laboratory, Michael Feil and Ted Oberfeld/CRIR Research Centre, Jewish Rehabilitation Hospital, Laval, H7V 1R2, Qc, Canada. .,Département de kinésiologie, Université de Montréal, Laval, H7N 0A5, Qc, Canada.
| | - Chen Yang
- Department of Kinesiology and Physical Education, McGill University, Montreal, H2W 1S4, Qc, Canada.,Occupational Biomechanics and Ergonomics Laboratory, Michael Feil and Ted Oberfeld/CRIR Research Centre, Jewish Rehabilitation Hospital, Laval, H7V 1R2, Qc, Canada
| | - Mickael Begon
- Département de kinésiologie, Université de Montréal, Laval, H7N 0A5, Qc, Canada
| | - Julie Côté
- Department of Kinesiology and Physical Education, McGill University, Montreal, H2W 1S4, Qc, Canada.,Occupational Biomechanics and Ergonomics Laboratory, Michael Feil and Ted Oberfeld/CRIR Research Centre, Jewish Rehabilitation Hospital, Laval, H7V 1R2, Qc, Canada
| |
Collapse
|
28
|
Madsen BK, Søgaard K, Andersen LL, Skotte J, Tornøe B, Jensen RH. Neck/shoulder function in tension-type headache patients and the effect of strength training. J Pain Res 2018; 11:445-454. [PMID: 29503581 PMCID: PMC5827678 DOI: 10.2147/jpr.s146050] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Introduction Muscle pain has been associated with reduced maximal muscle strength, and reduced rate of force development (RFD). Strength training (ST) has shown an effect in not only normalizing muscle function but also reducing neck muscle pain. Aim The aims of this study were to compare muscle function in terms of strength, force steadiness in neck flexion, as well as extension, and rate of RFD of the shoulder in tension-type headache (TTH) patients and healthy controls and to examine the correlation to tenderness. Furthermore, the aim of the study was to examine the effect of ST on neck and shoulder functions in TTH patients. Participants and methods In all, 60 TTH patients and 30 sex- and age-matched healthy controls were included for a case–control comparison. The 60 patients with TTH were randomized into an ST and an ergonomic and posture correction (EP) control group. The ST group trained for 10 weeks with elastic bands. Results TTH patients had a lower extension force steadiness with a significant 15% higher coefficient of variation (CoV) compared to healthy controls (p=0.047). A significantly lower RFD (25%) was noted in the TTH group than in the healthy controls (p=0.031). A significant (p<0.01) and moderate correlation to muscle tenderness was found. In the intervention, 23 patients completed ST and 21 patients completed EP. No significant between-group effect was observed, but at 22 weeks follow-up, both groups had a significant within-group effect of improved extension force steadiness (ST: p=0.011 and EP: p<0.01). Conclusion TTH patients showed a deteriorated muscle function, indicated by a lower force steadiness and RFD, compared to the healthy controls. The effect of ST was not larger than EP as both groups of TTH patients showed some improvement in neck and shoulder functions during the 10 weeks intervention and at follow-up. Future interventions are needed to elucidate if normalization of muscle function can lead to a reduction in headache.
Collapse
Affiliation(s)
- Bjarne K Madsen
- Danish Headache Center, Department of Neurology, University of Copenhagen, Rigshospitalet-Glostrup, Glostrup
| | - Karen Søgaard
- Institute of Sports Science and Clinical Biomechanics, Physical Activity and Health in Work Life University of Southern Denmark, Odense.,Department of Clinical research, University of Southern Denmark, Odense
| | - Lars L Andersen
- National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Jørgen Skotte
- National Research Centre for the Working Environment, Copenhagen, Denmark
| | - Birte Tornøe
- Department of Health Sciences, Lund University, Lund, Sweden
| | - Rigmor H Jensen
- Danish Headache Center, Department of Neurology, University of Copenhagen, Rigshospitalet-Glostrup, Glostrup
| |
Collapse
|
29
|
Madsen BK, Søgaard K, Andersen LL, Tornøe B, Jensen RH. Efficacy of strength training on tension-type headache: A randomised controlled study. Cephalalgia 2017; 38:1071-1080. [PMID: 28750588 DOI: 10.1177/0333102417722521] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background Strength training has shown effects in reducing neck pain. As neck pain is highly prevalent in tension-type headache (TTH), it is relevant to examine the effect of strength training of the shoulder muscles on TTH patients. Aim To examine the effect of strength training of the shoulder/neck muscles on TTH frequency and duration. Methods Sixty patients with TTH were randomised into strength training or a control group. The strength training group trained ten weeks with elastic resistance bands. The control group performed ergonomic and posture correction. Efficacy was evaluated at follow-up after 19-22 weeks. Results Twenty-three patients completed strength training and 21 completed ergonomic and posture correction (per-protocol). No between-group effect was detected, but within groups numerical reductions were noted in both groups from baseline to follow-up. Frequency of TTH in the strength training group decreased by 11% ( P = 0.041) and duration decreased by10% ( P = 0.036), while the ergonomic and posture correction group showed a significant reduction in frequency of 24% ( P = 0.0033) and a decrease in duration of 27% ( P = 0.041). Conclusion No significant difference between the groups was found and the within-group effects did not reach clinical significance. Combining all the elements into a multifaceted intervention could prove more useful and should be further explored in future studies. Clinical trials registration number NCT02984826.
Collapse
Affiliation(s)
- Bjarne K Madsen
- 1 Danish Headache Centre, Department of Neurology, University of Copenhagen, Rigshospitalet, Glostrup, Denmark
| | - Karen Søgaard
- 2 Institute of Sports Science and Clinical Biomechanics, Physical Activity and Health in Work Life University of Southern Denmark, Odense, Denmark
| | - Lars L Andersen
- 3 National Research Centre for the Working Environment, Lersø Parkalle, Copenhagen, Denmark
| | - Birte Tornøe
- 4 Department of Health Sciences, Lund University, Lund, Sweden
| | - Rigmor H Jensen
- 1 Danish Headache Centre, Department of Neurology, University of Copenhagen, Rigshospitalet, Glostrup, Denmark
| |
Collapse
|
30
|
Søgaard K, Sjøgaard G. Physical Activity as Cause and Cure of Muscular Pain: Evidence of Underlying Mechanisms. Exerc Sport Sci Rev 2017; 45:136-145. [PMID: 28418998 PMCID: PMC5473374 DOI: 10.1249/jes.0000000000000112] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/08/2017] [Indexed: 01/18/2023]
Abstract
Work-related physical activity (PA), in terms of peak loads and sustained and/or repetitive contractions, presents risk factors for the development of muscular pain and disorders. However, PA as a training tailored to the employee's work exposure, health, and physical capacity offers prevention and rehabilitation. We suggest the concept of "Intelligent Physical Exercise Training" relying on evidence-based sports science training principles.
Collapse
Affiliation(s)
- Karen Søgaard
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense M, Denmark
| | | |
Collapse
|
31
|
Santos DFDSD, Melo Aquino BD, Jorge CO, Azambuja GD, Schiavuzzo JG, Krimon S, Neves JDS, Parada CA, Oliveira-Fusaro MCG. Muscle pain induced by static contraction in rats is modulated by peripheral inflammatory mechanisms. Neuroscience 2017; 358:58-69. [PMID: 28673715 DOI: 10.1016/j.neuroscience.2017.06.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 05/12/2017] [Accepted: 06/22/2017] [Indexed: 11/15/2022]
Abstract
Muscle pain is an important health issue and frequently related to static force exertion. The aim of this study is to evaluate whether peripheral inflammatory mechanisms are involved with static contraction-induced muscle pain in rats. To this end, we developed a model of muscle pain induced by static contraction performed by applying electrical pulses through electrodes inserted into muscle. We also evaluated the involvement of neutrophil migration, bradykinin, sympathetic amines and prostanoids. A single session of sustained static contraction of gastrocnemius muscle induced acute mechanical muscle hyperalgesia without affecting locomotor activity and with no evidence of structural damage in muscle tissue. Static contraction increased levels of creatine kinase but not lactate dehydrogenase, and induced neutrophil migration. Dexamethasone (glucocorticoid anti-inflammatory agent), DALBK (bradykinin B1 antagonist), Atenolol (β1 adrenoceptor antagonist), ICI 118,551 (β2 adrenoceptor antagonist), indomethacin (cyclooxygenase inhibitor), and fucoidan (non-specific selectin inhibitor) all reduced static contraction-induced muscle hyperalgesia; however, the bradykinin B2 antagonist, bradyzide, did not have an effect on static contraction-induced muscle hyperalgesia. Furthermore, an increased hyperalgesic response was observed when the selective bradykinin B1 agonist des-Arg9-bradykinin was injected into the previously stimulated muscle. Together, these findings demonstrate that static contraction induced mechanical muscle hyperalgesia in gastrocnemius muscle of rats is modulated through peripheral inflammatory mechanisms that are dependent on neutrophil migration, bradykinin, sympathetic amines and prostanoids. Considering the clinical relevance of muscle pain, we propose the present model of static contraction-induced mechanical muscle hyperalgesia as a useful tool for the study of mechanisms underlying static contraction-induced muscle pain.
Collapse
Affiliation(s)
- Diogo Francisco da Silva Dos Santos
- Laboratory of Studies of Pain and Inflammation, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Bruna de Melo Aquino
- Laboratory of Studies of Pain and Inflammation, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Carolina Ocanha Jorge
- Laboratory of Studies of Pain and Inflammation, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Graciana de Azambuja
- Laboratory of Studies of Pain and Inflammation, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Jalile Garcia Schiavuzzo
- Laboratory of Studies of Pain and Inflammation, School of Applied Sciences, State University of Campinas, Pedro Zaccaria 1300, Limeira, Sao Paulo, Brazil
| | - Suzy Krimon
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, Monteiro Lobato 255, Campinas, Sao Paulo, Brazil
| | - Juliana Dos Santos Neves
- Department of Morphology, Piracicaba Dental School, State University of Campinas, Limeira 901, Piracicaba, Sao Paulo, Brazil
| | - Carlos Amilcar Parada
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, Monteiro Lobato 255, Campinas, Sao Paulo, Brazil
| | | |
Collapse
|
32
|
NICOLETTI C, LÄUBLI T. Trapezius muscle activity and body movement at the beginning and the end of a workday and during the lunch period in female office employees. INDUSTRIAL HEALTH 2017; 55:162-172. [PMID: 28090066 PMCID: PMC5383413 DOI: 10.2486/indhealth.2016-0189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 01/05/2017] [Indexed: 06/06/2023]
Abstract
The aim of this study was to analyze the activity of the trapezius muscle and the arm acceleration during the course of a workday in office employees. It was examined if there are significant changes in trapezius muscle activity in the afternoon compared to the morning work period and relationships to the level of arm acceleration during lunchtime. Nineteen female office employees were recruited. A one hour period of the work in the morning, afternoon, and lunchtime were compared. The measures of the trapezius muscle activity and muscle rest time (TR) did not significantly differ between working in the morning (TR: median 10%; range 1%-49) or working in the afternoon (TR: median 18%; range 2%-34%). The 90th percentile of arm acceleration during lunch time significantly correlated with less trapezius muscle activity in the afternoon compared to the morning values (RT: Spearman R=0.80; p<0.01). Differences in the duration and level of trapezius muscle activity were bigger between the subjects than between different work periods or between lunchtime and work. Furthermore it seems that higher arm accelerations during lunch may be beneficial in reducing trapezius activity in the afternoon compared to the morning values.
Collapse
Affiliation(s)
- Corinne NICOLETTI
- Department of Health Sciences and Technology, ETH Zurich, Switzerland
| | - Thomas LÄUBLI
- Department of Health Sciences and Technology, ETH Zurich, Switzerland
- Augmented Community AID Research Center, Kyoto Institute of Technology, Japan
| |
Collapse
|
33
|
Tantawy SA, Abdul Rahman A, Abdul Ameer M. The relationship between the development of musculoskeletal disorders, body mass index, and academic stress in Bahraini University students. Korean J Pain 2017; 30:126-133. [PMID: 28416996 PMCID: PMC5392656 DOI: 10.3344/kjp.2017.30.2.126] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 02/11/2017] [Accepted: 03/07/2017] [Indexed: 02/07/2023] Open
Abstract
Background There are many mechanisms in which stress can lead to weight gain thus high a BMI. The endocrine and inflammatory pathway can directly increase abdominal adiposity. Another way in which stress leads to weight gain is through changes in health behaviors. The study aimed to investigate the prevalence of musculoskeletal disorders (MSDs) among healthy students of Ahlia University, and to determine the relationship between the development of MSDs and academic stressors and body mass index. Methods Self-administered questionnaires were distributed to 94 students aged 18-26 years who were enrolled at various Ahlia University colleges and met other inclusion criteria. The students responded to the standardized Nordic musculoskeletal questionnaire and the modified College Student Stress Inventory regarding musculoskeletal symptoms and academic stressors. Height and weight measurements were also obtained to determine body mass index. Results A total of 77.66% reported MSDs in one or more body part, with the prevalence being higher among women than among men. The 7-day prevalence of MSDs severe enough to interfere with activities of daily living was 60.64%, and 44.68% by female and male students, respectively. There was a significant relationship between academic stress and MSDs in the neck, shoulders, lower back, and hips, while the relationship between MSDs, and body mass index, academic stress, and grade point average was not significant. Conclusions The prevalence of MSDs among Ahlia University students was found to be high. Apart from the positive correlation between academic stress and MSDs in certain body parts, other correlations were not significant.
Collapse
Affiliation(s)
- Sayed A Tantawy
- Centre of Radiation, Oncology and Nuclear Medicine, Cairo University, Giza, Egypt.,Department of Physiotherapy, College of Medical & Health Sciences, Ahlia University, Manama, Kingdom of Bahrain
| | - Asma Abdul Rahman
- Department of Physiotherapy, College of Medical & Health Sciences, Ahlia University, Manama, Kingdom of Bahrain
| | - Maryam Abdul Ameer
- Department of Physiotherapy, College of Medical & Health Sciences, Ahlia University, Manama, Kingdom of Bahrain
| |
Collapse
|
34
|
Le P, Best TM, Khan SN, Mendel E, Marras WS. A review of methods to assess coactivation in the spine. J Electromyogr Kinesiol 2017; 32:51-60. [DOI: 10.1016/j.jelekin.2016.12.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 10/21/2016] [Accepted: 12/15/2016] [Indexed: 12/16/2022] Open
|
35
|
Del Rosso S, Abreu L, Webb HE, Zouhal H, Boullosa DA. Stress Markers During a Rally Car Competition. J Strength Cond Res 2016; 30:605-14. [PMID: 26907834 DOI: 10.1519/jsc.0000000000001131] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The aim of the study was to assess the stress responses in drivers during an official rally car race and the influence of fitness and body composition on stress hormones. Fitness and body composition were assessed in 9 rally car drivers with an incremental exercise test for determination of maximum aerobic speed (MAS) and 6-site skinfold method, respectively. Before (pre) and after (post) the first stage of an official rally car race, data were collected for heart rate (HR), blood samples were collected for analysis of hormones (i.e., epinephrine [EPI], norepinephrine [NE], cortisol, and aldosterone) and metabolites (i.e., lactate [LA], glucose, and ammonia). There were significant (p ≤ 0.05) increases in all assessed variables except glucose at postrace. Heart rate increased 93% (p ≤ 0.05) at the end of the race stage, reaching 88.77 ± 4.96% of HRpeak. Also, EPI and NE significantly (p = 0.001) increased by 45 and 65%, respectively, and LA increased by 395% (p < 0.001). Significant correlations between percent body fat (%BF) and postrace EPI (r = 0.95; p < 0.001), and percentage change of EPI (r = 0.83; p = 0.012) were observed. The MAS was not associated to any metabolic or hormonal variable. These results suggest that psycho-physiological stress induced by the race elicited important changes in hormonal and metabolic variables and that %BF could be an important mediator of psycho-physiological stress in rally car drivers. Specific programs, including both strength and aerobic training, and nutritional plans should be implemented for appropriate conditioning of rally car drivers.
Collapse
Affiliation(s)
- Sebastián Del Rosso
- 1Independent Researcher, Vigo, Spain;2Department of Kinesiology, Texas A&M University-Corpus Christi, Corpus Christi, Texas;3Movement Sport and Health Sciences Laboratory (M2S), UFR-APS, University of Rennes 2-ENS Rennes, Rennes, France; and4Post-Graduate Program in Physical Education, Catholic University of Brasilia, Aguas Claras, Brazil
| | | | | | | | | |
Collapse
|
36
|
Mahdavi N, Motamedzade M, Jamshidi AA, Darvishi E, Moghimbeygi A, Heidari Moghadam R. Upper trapezius fatigue in carpet weaving: the impact of a repetitive task cycle. INTERNATIONAL JOURNAL OF OCCUPATIONAL SAFETY AND ERGONOMICS 2016; 24:41-51. [DOI: 10.1080/10803548.2016.1234706] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Neda Mahdavi
- Ergonomics Department, Hamadan University of Medical Sciences and Health Services, Iran
| | - Majid Motamedzade
- Ergonomics Department, Hamadan University of Medical Sciences and Health Services, Iran
| | - Ali Ashraf Jamshidi
- Physical Therapy Department, Iran University of Medical Sciences and Health Services, Iran
| | - Ebrahim Darvishi
- Environmental Health Research Center, Kurdistan University of Medical Sciences, Iran
| | - Abbas Moghimbeygi
- Department of Biostatistics and Epidemiology, Hamadan University of Medical Sciences and Health Services, Iran
| | | |
Collapse
|
37
|
Marker RJ, Balter JE, Nofsinger ML, Anton D, Fethke NB, Maluf KS. Upper trapezius muscle activity in healthy office workers: reliability and sensitivity of occupational exposure measures to differences in sex and hand dominance. ERGONOMICS 2016; 59:1205-14. [PMID: 26924036 PMCID: PMC9333326 DOI: 10.1080/00140139.2015.1130860] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Patterns of cervical muscle activity may contribute to overuse injuries in office workers. The purpose of this investigation was to characterise patterns of upper trapezius muscle activity in pain-free office workers using traditional occupational exposure measures and a modified Active Amplitude Probability Distribution Function (APDF), which considers only periods of active muscle contraction. Bilateral trapezius muscle activity was recorded in 77 pain-free office workers for 1-2 full days in their natural work environment. Mean amplitude, gap frequency, muscular rest and Traditional and Active APDF amplitudes were calculated. All measures demonstrated fair to substantial reliability. Dominant muscles demonstrated higher amplitudes of activity and less muscular rest compared to non-dominant, and women demonstrated less muscular rest with no significant difference in amplitude assessed by Active APDF compared to men. These findings provide normative data to identify atypical motor patterns that may contribute to persistence or recurrence of neck pain in office workers. Practitioner Summary: Upper trapezius muscle activity was characterised in a large cohort of pain-free workers using electromyographic recordings from office environments. Dominant muscles demonstrated higher activity and less rest than non-dominant, and women demonstrated less rest than men. Results may be used to identify atypical trapezius muscle activity in office workers.
Collapse
Affiliation(s)
- Ryan J. Marker
- Rehabilitation Science Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Jaclyn E. Balter
- Physical Therapy Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Micaela L. Nofsinger
- Physical Therapy Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Dan Anton
- Department of Physical Therapy, Eastern Washington University, Spokane WA, USA
| | - Nathan B. Fethke
- Department of Occupational and Environmental Health, University of Iowa, Iowa City IA, USA
| | - Katrina S. Maluf
- Rehabilitation Science Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
- Physical Therapy Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
- School of Exercise and Nutritional Sciences, Doctor of Physical Therapy Program, San Diego State University, San Diego, CA, USA
| |
Collapse
|
38
|
Flexion–relaxation ratio in computer workers with and without chronic neck pain. J Electromyogr Kinesiol 2016; 26:8-17. [DOI: 10.1016/j.jelekin.2015.12.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 10/29/2015] [Accepted: 12/19/2015] [Indexed: 11/20/2022] Open
|
39
|
Kim MS. Neck kinematics and sternocleidomastoid muscle activation during neck rotation in subjects with forward head posture. J Phys Ther Sci 2015; 27:3425-8. [PMID: 26696712 PMCID: PMC4681919 DOI: 10.1589/jpts.27.3425] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 08/13/2015] [Indexed: 02/05/2023] Open
Abstract
[Purpose] The present study investigated differences in the kinematics of the neck and
activation of the sternocleidomastoid (SCM) muscle during neck rotation between subjects
with and without forward head posture (FHP). [Subjects and Methods] Twenty-eight subjects
participated in the study (14 with FHP, 14 without FHP). Subjects performed neck rotation
in two directions, left and right. The kinematics of rotation-lateral flexion movement
patterns were recorded using motion analysis. Activity in the bilateral SCM muscles was
measured using surface electromyography. Differences in neck kinematics and activation of
SCM between the groups were analyzed by independent t-tests. [Results] Maintaining FHP
increased the rotation-lateral flexion ratio significantly in both directions. The FHP
group had significantly faster onset time for lateral flexion movement in both directions
during neck rotation. Regarding the electromyography of the SCM muscles during neck
rotation in both directions, the activity values of subjects with FHP were greater than
those of subjects without FHP for the contralateral SCM muscles. [Conclusion] FHP can
induce changes in movement in the frontal plane and SCM muscle activation during neck
rotation. Thus, clinicians should consider movement in the frontal plane as well as in the
sagittal plane when assessing and treating patients with forward head posture.
Collapse
Affiliation(s)
- Man-Sig Kim
- Department of Systems Management Engineering, College of Engineering, Inje University, Republic of Korea
| |
Collapse
|
40
|
Effects of Experimental Tooth Clenching on Pain and Intramuscular Release of 5-HT and Glutamate in Patients With Myofascial TMD. Clin J Pain 2015; 31:740-9. [DOI: 10.1097/ajp.0000000000000154] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
41
|
Widanarko B, Legg S, Devereux J, Stevenson M. Interaction between physical and psychosocial risk factors on the presence of neck/shoulder symptoms and its consequences. ERGONOMICS 2015; 58:1507-1518. [PMID: 25815974 DOI: 10.1080/00140139.2015.1019936] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This study aimed to quantify the interaction between physical and psychosocial factors on the presence of neck/shoulder symptoms (NSS) and its consequences (reduced activities and absenteeism) among 1294 coal mining workers in Indonesia. A self-administered questionnaire was used to obtain information on current workplace exposure and NSS and its consequences. Participants were grouped into one of four combination exposure groups: low physical and low psychosocial (as the reference group); low physical and high psychosocial; high physical and low psychosocial, and high physical and high psychosocial (HPhyHPsy). The attributable proportion (AP) due to interaction between both factors was examined. Individuals in the HPhyHPsy group were most likely to report NSS [odds ratio (OR) 4.83, 95% confidence interval (CI) 2.43-9.58], reduced activities (OR 3.90, 95% CI 2.36-6.43), and absenteeism (OR 3.91, 95% CI 2.11-7.25). This study has shown an interaction between physical and psychosocial factors that increases the OR of NSS (AP 0.49, 95% CI 0.08-0.89). Practitioner Summary: Although physical and psychosocial factors are known to be predictors for NSS, little is known about their interaction. Self-reported questionnaire was used to obtain information about physical and psychosocial factors at work. This study found an interaction between the physical and psychosocial risk factors that increases the odds ratio of NSS.
Collapse
Affiliation(s)
- Baiduri Widanarko
- a School of Public Health, College of Health, Centre for Ergonomics, Occupational Safety and Health, Massey University , Palmerston North , New Zealand
| | | | | | | |
Collapse
|
42
|
Neuronal nitric oxide synthase is dislocated in type I fibers of myalgic muscle but can recover with physical exercise training. BIOMED RESEARCH INTERNATIONAL 2015; 2015:265278. [PMID: 25853139 PMCID: PMC4380094 DOI: 10.1155/2015/265278] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 01/24/2015] [Accepted: 02/18/2015] [Indexed: 11/18/2022]
Abstract
Trapezius myalgia is the most common type of chronic neck pain. While physical exercise reduces pain and improves muscle function, the underlying mechanisms remain unclear. Nitric oxide (NO) signaling is important in modulating cellular function, and a dysfunctional neuronal NO synthase (nNOS) may contribute to an ineffective muscle function. This study investigated nNOS expression and localization in chronically painful muscle. Forty-one women clinically diagnosed with trapezius myalgia (MYA) and 18 healthy controls (CON) were included in the case-control study. Subsequently, MYA were randomly assigned to either 10 weeks of specific strength training (SST, n = 18), general fitness training (GFT, n = 15), or health information (REF, n = 8). Distribution of fiber type, cross-sectional area, and sarcolemmal nNOS expression did not differ between MYA and CON. However, MYA showed increased sarcoplasmic nNOS localization (18.8 ± 12 versus 12.8 ± 8%, P = 0.049) compared with CON. SST resulted in a decrease of sarcoplasm-localized nNOS following training (before 18.1 ± 12 versus after 12.0 ± 12%; P = 0,027). We demonstrate that myalgic muscle displays altered nNOS localization and that 10 weeks of strength training normalize these disruptions, which supports previous findings of impaired muscle oxygenation during work tasks and reduced pain following exercise.
Collapse
|
43
|
Sjøgaard G, Søgaard K. Muscle activity pattern dependent pain development and alleviation. J Electromyogr Kinesiol 2014; 24:789-94. [DOI: 10.1016/j.jelekin.2014.08.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Accepted: 08/18/2014] [Indexed: 11/25/2022] Open
|
44
|
Søgaard K, Olsen HB, Blangsted AK, Sjøgaard G. Single motor unit firing behavior in the right trapezius muscle during rapid movement of right or left index finger. Front Hum Neurosci 2014; 8:881. [PMID: 25404907 PMCID: PMC4217388 DOI: 10.3389/fnhum.2014.00881] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 10/13/2014] [Indexed: 11/15/2022] Open
Abstract
Background: Computer work is associated with low level sustained activity in the trapezius muscle that may cause development of trapezius myalgia. Such a low level activity may be attention related or alternatively, be part of a general multi joint motor program providing stabilization of the shoulder joint as a biomechanical prerequisite for precise finger manipulation. This study examines single motor unit (MU) firing pattern in the right trapezius muscle during fast movements of ipsilateral or contralateral index finger. A modulation of the MU firing rate would support the existence of a general multi joint motor program, while a generally increased and continuous firing rate would support the attention related muscle activation. Method: Twelve healthy female subjects were seated at a computer work place with elbows and forearms supported. Ten double clicks (DC) were performed with right and left index finger on a computer mouse instrumented with a trigger. Surface electromyographic signals (EMG) was recorded from right and left trapezius muscle. Intramuscular EMG was recorded with a quadripolar wire electrode inserted into the right trapezius. Surface EMG was analyzed as RMS and presented as %MVE. The intramuscular EMG signals were decomposed into individual MU action potential trains using a computer algorithm based on signal shape recognition and manual editing. Instantaneous firing rate (IFR) was calculated as the inverse of each inter-spike interval (ISI). All ISI shorter than 20 ms were defined as doublets. For all MU IFR was spike triggered averaged across the 10 DC to show the modulation during DC as well as for calculation of the cross correlation coefficient (CCC). Results: All subjects showed surface EMG activity in both right and left trapezius ranging from 1.8 %MVE to 2.5 %MVE. Regarding intramuscular EMG during right hand DC a total of 32 MUs were identified. Four subjects showed no MU activity. Four showed MU activity with low mean firing rate (MFR) with weak or no variations related to the timing of DC. Four subjects showed firing patterns with large modulation in IFR with a clear temporal relation to the DC. During left hand DC 15 MUs were identified in four subjects, for two of the subjects with IFR modulations clearly related to DC. During both ipsi- and contralateral DC, doublets occurred sporadically as well as related to DC Conclusion: In conclusion, DC with ipsi- and contralateral fast movements of the index finger was found to evoke biomechanically as well as attention related activity pattern in the trapezius muscle. Doublets were for three of the subjects found as an integrated part of MU activation in the trapezius muscle and for one subject temporarily related to DC.
Collapse
Affiliation(s)
- Karen Søgaard
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense Denmark
| | - Henrik B Olsen
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense Denmark
| | | | - Gisela Sjøgaard
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense Denmark
| |
Collapse
|
45
|
Widanarko B, Legg S, Devereux J, Stevenson M. The combined effect of physical, psychosocial/organisational and/or environmental risk factors on the presence of work-related musculoskeletal symptoms and its consequences. APPLIED ERGONOMICS 2014; 45:1610-1621. [PMID: 24934982 DOI: 10.1016/j.apergo.2014.05.018] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 05/18/2014] [Accepted: 05/26/2014] [Indexed: 06/03/2023]
Abstract
This study assessed the combined effect of physical and psychosocial/organisational and/or environmental factors on the presence of musculoskeletal symptoms (MSS) and its consequences (reduced activities and absenteeism due to MSS) in a random sample of 3003 workers in New Zealand. By telephone interview, participants reported their current workplace exposures and MSS (neck/shoulder, arm/elbow, wrist and low back) and its consequences. Data were analysed using multivariable logistic regression. Combined exposure to physical and psychosocial/organisational and/or environmental factors increased the odds of MSS in the neck/shoulder (OR 3.14, 95% CI 1.79-5.52), arms/elbow regions (OR 4.14, 95% CI 2.21-7.76) and low back (OR 1.74, 95% CI 1.28-2.37) and its consequences, i.e. reduced activities due to neck/shoulder symptoms (OR 5.45, 95% CI 2.28-13.00), absenteeism due to neck/shoulder symptoms (OR 5.19, 95% CI 2.24-12.01) and absenteeism due to low back symptoms (OR 4.37, 95% CI 2.92-6.53). In contrast, favourable psychosocial/organisational work conditions reduced the odds of wrist symptoms due to poor physical work conditions (OR 2.19, 95% CI 1.44-3.34). We conclude that to reduce MSS and its consequences, employers need to adopt a multifaceted approach: concentrate on improving physical conditions as well as the psychosocial/organisational and environmental aspects of the working environment.
Collapse
Affiliation(s)
- Baiduri Widanarko
- Centre for Ergonomics, Occupational Safety and Health, School of Public Health, College of Health, Massey University, Palmerston North, New Zealand; Department of Occupational Health and Safety, Faculty of Public Health, University of Indonesia, Depok 16424, Indonesia.
| | - Stephen Legg
- Centre for Ergonomics, Occupational Safety and Health, School of Public Health, College of Health, Massey University, Palmerston North, New Zealand
| | - Jason Devereux
- Lloyd's Register Consulting, London, UK; Business Psychology Unit, University College London, London, UK
| | - Mark Stevenson
- EpiCentre, Institute of Veterinary, Animal and Biological Sciences, College of Sciences, Massey University, Palmerston North, New Zealand
| |
Collapse
|
46
|
Myrtveit SM, Sivertsen B, Skogen JC, Frostholm L, Stormark KM, Hysing M. Adolescent neck and shoulder pain--the association with depression, physical activity, screen-based activities, and use of health care services. J Adolesc Health 2014; 55:366-72. [PMID: 24746679 DOI: 10.1016/j.jadohealth.2014.02.016] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 12/17/2013] [Accepted: 02/25/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE Neck and shoulder pain is frequent in adolescents, and multiple factors seem to affect the risk of such symptoms. We aimed to investigate the prevalence of neck and shoulder pain in Norwegian adolescence and to examine whether behavioral and emotional factors were associated with the risk of neck and shoulder pain. Finally we aimed to investigate whether neck and shoulder pain was related to the use of health services. METHOD Data from the population-based study ung@hordaland were used. Participants were asked how often during the last 6 months they had experienced neck and shoulder pain. The association between frequent neck and shoulder pain and physical activity, symptoms of depression, and screen-based activities was evaluated using logistic regression analyses stratified by gender. The relative risk of visiting health services when reporting neck and shoulder pain was calculated using multiple logistic regression analyses. RESULTS Frequent neck and shoulder pain was reported by 20.0% (1,797 of the total 8,990) and more often by girls than boys (p < .001). A high score of depressive symptoms was the strongest risk factor for neck and shoulder pain in both boys and girls (odds ratio = 6.14 [95% confidence interval 4.48-8.42] and odds ratio = 3.10 [95% confidence interval 2.63-3.67], respectively). Frequent screen-based activities slightly increased the risk while physical activity was protective. Individuals reporting neck and shoulder pain more often visited their general practitioner (47.1% vs. 31.8%) and school health services (24.6% vs. 13.5%). CONCLUSION Frequent neck and shoulder pain was reported in 20% of Norwegian adolescents. Symptoms of depression and screen-based activities increased the risk of neck and shoulder pain while physical activity was protective. Individuals reporting neck and shoulder pain visited health services more frequently than others.
Collapse
Affiliation(s)
- Solbjørg Makalani Myrtveit
- Department of Clinical Science, University of Bergen, Bergen, Norway; Department of Public Mental Health, Division of Mental Health, Norwegian Institute of Public Health, Bergen, Norway.
| | - Børge Sivertsen
- Department of Public Mental Health, Division of Mental Health, Norwegian Institute of Public Health, Bergen, Norway; Uni Health, Uni Research, Bergen, Norway; Department of Psychiatry, Helse Fonna HF, Haugesund, Norway
| | - Jens Christoffer Skogen
- Department of Public Mental Health, Division of Mental Health, Norwegian Institute of Public Health, Bergen, Norway; Alcohol and Drug Research Western Norway, Stavanger University Hospital, Stavanger, Norway
| | - Lisbeth Frostholm
- The Research Clinic for Functional Disorders, Aarhus University Hospital, Aarhus, Denmark
| | - Kjell Morten Stormark
- Regional Centre for Child and Youth Mental Health and Child Welfare, Uni Health, Uni Research, Bergen, Norway
| | - Mari Hysing
- Regional Centre for Child and Youth Mental Health and Child Welfare, Uni Health, Uni Research, Bergen, Norway
| |
Collapse
|
47
|
Nicoletti C, Spengler CM, Läubli T. Physical workload, trapezius muscle activity, and neck pain in nurses' night and day shifts: a physiological evaluation. APPLIED ERGONOMICS 2014; 45:741-746. [PMID: 24140243 DOI: 10.1016/j.apergo.2013.09.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 09/18/2013] [Accepted: 09/24/2013] [Indexed: 06/02/2023]
Abstract
The purpose of this study was to compare physical workload, electromyography (EMG) of the trapezius muscle, neck pain and mental well-being at work between night and day shifts in twenty Swiss nurses. Work pulse (average increase of heart rate over resting heart rate) was lower during night (27 bpm) compared to day shifts (34 bpm; p < 0.01). Relative arm acceleration also indicated less physical activity during night (82% of average) compared to day shifts (110%; p < 0.01). Rest periods were significantly longer during night shifts. Trapezius muscle rest time was longer during night (13% of shift duration) than day shifts (7%; p < 0.01) and the 50th percentile of EMG activity was smaller (p = 0.02), indicating more opportunities for muscle relaxation during night shifts. Neck pain and mental well-being at work were similar between shifts. Subjective perception of burden was similar between shifts despite less physical burden at night, suggesting there are other contributing factors.
Collapse
Affiliation(s)
- Corinne Nicoletti
- Department of Health Sciences and Technology, ETH Zurich, Sensory-Motor Systems Lab, 8092 Zurich, Switzerland; Exercise Physiology Lab, Institute of Human Movement Sciences and Sport, ETH Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
| | - Christina M Spengler
- Exercise Physiology Lab, Institute of Human Movement Sciences and Sport, ETH Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland; Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
| | - Thomas Läubli
- Department of Health Sciences and Technology, ETH Zurich, Sensory-Motor Systems Lab, 8092 Zurich, Switzerland; Holistics Prosthetics Research Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku 606-8585, Japan.
| |
Collapse
|
48
|
NICOLETTI C, MÜLLER C, TOBITA I, NAKASEKO M, LÄUBLI T. Trapezius muscle load, heart rate and time pressure during day and night shift in Swiss and Japanese nurses. INDUSTRIAL HEALTH 2014; 52:225-234. [PMID: 24633074 PMCID: PMC4209578 DOI: 10.2486/indhealth.2013-0188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 01/27/2014] [Indexed: 06/03/2023]
Abstract
The aim of the present study was to analyze the activity of the trapezius muscle, the heart rate and the time pressure of Swiss and Japanese nurses during day and night shifts. The parameters were measured during a day and a night shift of 17 Swiss and 22 Japanese nurses. The observed rest time of the trapezius muscle was longer for Swiss than for Japanese nurses during both shifts. The 10th and the 50th percentile of the trapezius muscle activity showed a different effect for Swiss than for Japanese nurses. It was higher during the day shift of Swiss nurses and higher during the night shift of Japanese nurses. Heart rate was higher for both Swiss and Japanese nurses during the day. The time pressure was significantly higher for Japanese than for Swiss nurses. Over the duration of the shifts, time pressure increased for Japanese nurses and slightly decreased for those from Switzerland. Considering trapezius muscle activity and time pressure, the nursing profession was more burdening for the examined Japanese nurses than for Swiss nurses. In particular, the night shift for Japanese nurses was characterized by a high trapezius muscle activity and only few rest times for the trapezius muscle.
Collapse
Affiliation(s)
- Corinne NICOLETTI
- Department of Health Sciences and Technology, ETH Zurich,
Switzerland
| | | | - Itoko TOBITA
- Occupational Ergonomic Unit, Management in Health Care
Sciences, Graduate School of Health Sciences, Jikei Institute, Japan
| | - Masaru NAKASEKO
- Occupational Ergonomic Unit, Management in Health Care
Sciences, Graduate School of Health Sciences, Jikei Institute, Japan
- Holistics Prosthetics Research Center, Kyoto Institute of
Technology, Japan
| | - Thomas LÄUBLI
- Department of Health Sciences and Technology, ETH Zurich,
Switzerland
- Holistics Prosthetics Research Center, Kyoto Institute of
Technology, Japan
| |
Collapse
|
49
|
Borisut S, Vongsirinavarat M, Vachalathiti R, Sakulsriprasert P. Effects of strength and endurance training of superficial and deep neck muscles on muscle activities and pain levels of females with chronic neck pain. J Phys Ther Sci 2013; 25:1157-62. [PMID: 24259936 PMCID: PMC3818764 DOI: 10.1589/jpts.25.1157] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 05/04/2013] [Indexed: 12/03/2022] Open
Abstract
[Purpose] To compare muscle activities and pain levels of females with chronic neck pain receiving different exercise programs. [Subjects and Methods] One hundred females with chronic neck pain participated in this study. They were randomly allocated into 4 groups (n = 25) on the basis of the exercises performed as follows: strength-endurance exercise, craniocervical flexion exercise, combination of strength-endurance and craniocervical flexion exercise and control groups. Pain, disability levels and changes in the muscle activities of the cervical erector spinae (CE), sternocleidomastoid (SCM), anterior scalenes (AS) and upper trapezius (UT) muscles were evaluated before and after the interventions. [Results] After 12 weeks of exercise intervention, all three exercise groups showed improvements in pain and disability. The muscle activities during the typing task were significantly different from the control group in all three exercise groups for all muscles except those of the extensor muscles in the craniocervical flexion exercise group. [Conclusion] The results of this study indicate that exercises for the cervical muscles improve pain and disability. The exercise programs reduced the activities of almost all cervical muscles.
Collapse
|
50
|
Taspinar B, Taspinar F, Guclu S, Nalbant A, Calik BB, Uslu A, Inal S. Investigation of the association between mobbing and musculoskeletal discomfort in academicians. JAPANESE PSYCHOLOGICAL RESEARCH 2013. [DOI: 10.1111/jpr.12030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|