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Jeon J, Kwon SY, Lee YM, Hong J, Yu J, Kim J, Kim SG, Lee D. Influence of the Hawthorne effect on spatiotemporal parameters, kinematics, ground reaction force, and the symmetry of the dominant and nondominant lower limbs during gait. J Biomech 2023; 152:111555. [PMID: 37030040 DOI: 10.1016/j.jbiomech.2023.111555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 02/24/2023] [Accepted: 03/20/2023] [Indexed: 04/08/2023]
Abstract
The Hawthorne effect is a change in behavior resulting from awareness of being observed or evaluated. This study aimed to determine whether awareness of being evaluated or presence of an observer influence gait. Twenty-one young women were asked to walk in three conditions. In the first condition (unawareness of evaluation; UE), participants were aware that it was a practice trial, and there was no observer. In the second condition (awareness of evaluation; AE), participants were aware that their gait was being evaluated. The third condition (AE + researcher observation; RO) was similar to the second condition except that an additional researcher observed the participant' gait. The spatiotemporal, kinematic, ground reaction forces, and ratio index (symmetry of both lower limbs) were compared among the three conditions. A higher ratio index indicated a relative increase in the value on left versus right. Gait speed (P = 0.012) and stride length (right and left; P = 0.006 and 0.007, respectively) were significantly increased in the AE + RO than in UE. Range of motion of the right hip and left ankle was significantly greater in AE than in UE (P = 0.039 and 0.012, respectively). The ratio index of ground reaction force during push-off was significantly higher in AE and AE + RO conditions than in UE (P < 0.001 and P = 0.004, respectively). The Hawthorne effect (awareness of being evaluated or presence of an observer) potentially influences gait. Thus, factors that influence gait analysis should be considered when evaluating normal gait.
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Affiliation(s)
- Jeongwoo Jeon
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea
| | - Seon-Young Kwon
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea
| | - Yoon-Mi Lee
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea
| | - Jiheon Hong
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea
| | - Jaeho Yu
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea
| | - Jinseop Kim
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea
| | - Seong-Gil Kim
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea
| | - Dongyeop Lee
- Department of Physical therapy, College of Health Sciences, SunMoon University, Asan-si, Chungcheongnam-do, Republic of Korea.
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Lin J, Halaki M, Leaver A. Limited evidence of altered gait parameters in people with chronic nonspecific low back pain. Gait Posture 2023; 99:98-103. [PMID: 36368242 DOI: 10.1016/j.gaitpost.2022.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 10/29/2022] [Accepted: 11/02/2022] [Indexed: 11/06/2022]
Abstract
BACKGROUND Differences in gait parameters have been shown between people with and without low back pain (LBP). However, previous studies did not well control factors such as sex, age, height and walking speed known to influence gait parameters. RESEARCH QUESTION Is gait altered in people with LBP when sex, age, height and walking speed are controlled? METHODS A series of gait parameters were measured in 16 participants with LBP and 16 age, sex and height matched healthy controls while walking on an instrumented treadmill. LBP group walked at a comfortable speed whilst control group walked at their own comfortable speed and at the comfortable speed of their matched participants with LBP. Pain and disability were measured for the LBP group. The between-group differences in mean, standard deviation (SD) and coefficient of variation (CV) of gait parameters were tested using paired samples t-test, Wilcoxon signed-rank test or two-factor repeated measures analyses of variance. RESULTS The median (interquartile range) of pain intensity was 2 (1, 3.5). From 102 tests of between-group difference in mean, SD and CV of 17 gait parameters at both comfortable speed and matched speed walking, only the mean of stride length (p = 0.037) during matched speed walking and SD of single support phase (p = 0.040) during comfortable speed walking showed significant between-group differences. There was no significant between-group difference in the rest means (comfortable walking: p ≥ 0.116; matched speed walking: p ≥ 0.069), SDs (comfortable walking: p ≥ 0.066; matched speed walking: p ≥ 0.098) and CVs of gait parameters (comfortable walking: p ≥ 0.110; matched speed walking: p ≥ 0.121). SIGNIFICANCE The lack of significant between-group difference in gait parameters may suggest that the gait of people with low level of LBP were not altered when sex, age and height were controlled.
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Affiliation(s)
- Jianhua Lin
- Department of Rehabilitation Therapy, YangZhi Rehabilitation Hospital, Tongji University, Shanghai, China; Sydney School of Health Sciences, The University of Sydney, New South Wales, Australia.
| | - Mark Halaki
- Sydney School of Health Sciences, The University of Sydney, New South Wales, Australia
| | - Andrew Leaver
- Sydney School of Health Sciences, The University of Sydney, New South Wales, Australia
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Berkhout C, Berbra O, Favre J, Collins C, Calafiore M, Peremans L, Van Royen P. Defining and evaluating the Hawthorne effect in primary care, a systematic review and meta-analysis. Front Med (Lausanne) 2022; 9:1033486. [PMID: 36425097 PMCID: PMC9679018 DOI: 10.3389/fmed.2022.1033486] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 10/18/2022] [Indexed: 10/31/2023] Open
Abstract
In 2015, we conducted a randomized controlled trial (RCT) in primary care to evaluate if posters and pamphlets dispensed in general practice waiting rooms enhanced vaccination uptake for seasonal influenza. Unexpectedly, vaccination uptake rose in both arms of the RCT whereas public health data indicated a decrease. We wondered if the design of the trial had led to a Hawthorne effect (HE). Searching the literature, we noticed that the definition of the HE was unclear if stated. Our objectives were to refine a definition of the HE for primary care, to evaluate its size, and to draw consequences for primary care research. We designed a Preferred Reporting Items for Systematic reviews and Meta-Analyses review and meta-analysis between January 2012 and March 2022. We included original reports defining the HE and reports measuring it without setting limitations. Definitions of the HE were collected and summarized. Main published outcomes were extracted and measures were analyzed to evaluate odds ratios (ORs) in primary care. The search led to 180 records, reduced on review to 74 for definition and 15 for quantification. Our definition of HE is "an aware or unconscious complex behavior change in a study environment, related to the complex interaction of four biases affecting the study subjects and investigators: selection bias, commitment and congruence bias, conformity and social desirability bias and observation and measurement bias." Its size varies in time and depends on the education and professional position of the investigators and subjects, the study environment, and the outcome. There are overlap areas between the HE, placebo effect, and regression to the mean. In binary outcomes, the overall OR of the HE computed in primary care was 1.41 (95% CI: [1.13; 1.75]; I 2 = 97%), but the significance of the HE disappears in well-designed studies. We conclude that the HE results from a complex system of interacting phenomena and appears to some degree in all experimental research, but its size can considerably be reduced by refining study designs.
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Affiliation(s)
- Christophe Berkhout
- Department of General Practice/Family Medicine, Université de Lille, Lille, France
- Department of Family Medicine and Population Health, Universiteit Antwerpen, Antwerp, Belgium
| | - Ornella Berbra
- Department of General Practice/Family Medicine, Université de Lille, Lille, France
| | - Jonathan Favre
- Department of General Practice/Family Medicine, Université de Lille, Lille, France
| | | | - Matthieu Calafiore
- Department of General Practice/Family Medicine, Université de Lille, Lille, France
- ULR 2694 METRICS, Université de Lille, Lille, France
| | - Lieve Peremans
- Department of Family Medicine and Population Health, Universiteit Antwerpen, Antwerp, Belgium
- Department of Nursing and Midwifery, Universiteit Antwerpen, Antwerp, Belgium
| | - Paul Van Royen
- Department of Family Medicine and Population Health, Universiteit Antwerpen, Antwerp, Belgium
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Akgülle AH, Haidar M, Baştürk DK, Gündoğdu M, Coşkun ÖK. Hawthorne Effect in Gait Analysis of Children with In-Toeing Caused by Increased Femoral Anteversion. Indian J Orthop 2022; 56:1789-1794. [PMID: 36187586 PMCID: PMC9485350 DOI: 10.1007/s43465-022-00729-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 08/20/2022] [Indexed: 02/04/2023]
Abstract
Background In-toeing is one of the main reasons children are applying to the orthopedics clinic. In the clinical settings, during in-toeing gait assessment parents often define that their child does not walk same at the clinic as at home, linked possibly to Hawthorne effect. Research Question How does the in-toeing angle differ when children are aware, versus when they are not aware of their gait inspection? Methods This single center, clinical, cross-sectional, observational study looked into the variation in gait pattern of twelve children with in-toeing, with and without their awareness. Two videos for each child was recorded with a smart phone, once at the clinic while aware and once by the family without awareness, and uploaded into Kinovea software for gait analysis. The angle of foot in-toeing was measured and analyzed using SPSS comparison of means and correlations. Results The gait pattern evaluated with the angle of in-toeing showed a significant difference between the two videos of the same child. The angle difference returned a p value of 0.000 using paired sample t test and a Cohen's d value of 1.4, representing the large significance between clinic and family recorded videos. The initial foot in-toeing angle showed a moderate positive Pearson's correlation of 0.031 when compared with the angle difference in both settings. Significance These results highlight the importance of including family recorded videos in gait pattern analysis without the patient's awareness. The study not only shows the significant difference found which can be explained by Hawthorne Effect but also suggests a clearer path of understanding the child's condition with the family.
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Affiliation(s)
- Ahmet Hamdi Akgülle
- Department of Orthopaedic Surgery and Traumatology, Marmara University School of Medicine, Istanbul, Turkey
| | - Mariam Haidar
- Department of Orthopaedic Surgery and Traumatology, Marmara University School of Medicine, Istanbul, Turkey
| | - Doruk Kaan Baştürk
- Department of Orthopaedic Surgery and Traumatology, Marmara University School of Medicine, Istanbul, Turkey
| | - Mert Gündoğdu
- Department of Orthopaedic Surgery and Traumatology, Marmara University School of Medicine, Istanbul, Turkey
| | - Özge Kenis Coşkun
- Department of Orthopaedic Surgery and Traumatology, Marmara University School of Medicine, Istanbul, Turkey
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Smith JA, Stabbert H, Bagwell JJ, Teng HL, Wade V, Lee SP. Do people with low back pain walk differently? A systematic review and meta-analysis. JOURNAL OF SPORT AND HEALTH SCIENCE 2022; 11:450-465. [PMID: 35151908 PMCID: PMC9338341 DOI: 10.1016/j.jshs.2022.02.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 12/04/2021] [Accepted: 12/17/2021] [Indexed: 05/05/2023]
Abstract
BACKGROUND The biomechanics of the trunk and lower limbs during walking and running gait are frequently assessed in individuals with low back pain (LBP). Despite substantial research, it is still unclear whether consistent and generalizable changes in walking or running gait occur in association with LBP. The purpose of this systematic review was to identify whether there are differences in biomechanics during walking and running gait in individuals with acute and persistent LBP compared with back-healthy controls. METHODS A search was conducted in PubMed, CINAHL, SPORTDiscus, and PsycINFO in June 2019 and was repeated in December 2020. Studies were included if they reported biomechanical characteristics of individuals with and without LBP during steady-state or perturbed walking and running. Biomechanical data included spatiotemporal, kinematic, kinetic, and electromyography variables. The reporting quality and potential for bias of each study was assessed. Data were pooled where possible to compare the standardized mean differences (SMD) between back pain and back-healthy control groups. RESULTS Ninety-seven studies were included and reviewed. Two studies investigated acute pain and the rest investigated persistent pain. Nine studies investigated running gait. Of the studies, 20% had high reporting quality/low risk of bias. In comparison with back-healthy controls, individuals with persistent LBP walked slower (SMD = -0.59, 95% confidence interval (95%CI): -0.77 to -0.42)) and with shorter stride length (SMD = -0.38, 95%CI: -0.60 to -0.16). There were no differences in the amplitude of motion in the thoracic or lumbar spine, pelvis, or hips in individuals with LBP. During walking, coordination of motion between the thorax and the lumbar spine/pelvis was significantly more in-phase in the persistent LBP groups (SMD = -0.60, 95%CI: -0.90 to -0.30), and individuals with persistent LBP exhibited greater amplitude of activation in the paraspinal muscles (SMD = 0.52, 95%CI: 0.23-0.80). There were no consistent differences in running biomechanics between groups. CONCLUSION There is moderate-to-strong evidence that individuals with persistent LBP demonstrate differences in walking gait compared to back-healthy controls.
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Affiliation(s)
- Jo Armour Smith
- Department of Physical Therapy, Chapman University, Irvine, CA 92618, USA.
| | - Heidi Stabbert
- Department of Physical Therapy, Chapman University, Irvine, CA 92618, USA
| | - Jennifer J Bagwell
- Department of Physical Therapy, California State University, Long Beach, CA 90840, USA
| | - Hsiang-Ling Teng
- Department of Physical Therapy, California State University, Long Beach, CA 90840, USA
| | - Vernie Wade
- Department of Physical Therapy, Chapman University, Irvine, CA 92618, USA
| | - Szu-Ping Lee
- Department of Physical Therapy, University of Nevada, Las Vegas, NV 89154, USA
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Natarajan P, Fonseka RD, Sy LW, Maharaj MM, Mobbs RJ. Analysing Gait Patterns in Degenerative Lumbar Spine Disease Using Inertial Wearable Sensors: An Observational Study. World Neurosurg 2022; 163:e501-e515. [PMID: 35398575 DOI: 10.1016/j.wneu.2022.04.013] [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: 02/05/2022] [Revised: 04/03/2022] [Accepted: 04/04/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Using a chest-based inertial wearable sensor, we examined the quantitative gait patterns associated with lumbar disc herniation (LDH), lumbar spinal stenosis (LSS), and chronic mechanical low back pain (CMLBP). 'Pathological gait signatures' were reported as statistically significant group difference (%) from the 'normative' gait values of an age-matched control population. METHODS A sample of patients presenting to the Prince of Wales Private Hospital (Sydney, Australia) with primary diagnoses of LDH, LSS, or CMLBP were recruited. Spatial, temporal, asymmetry, and variability metrics were compared with age-matched (±2 years) control participants recruited from the community. Participants were fitted at the sternal angle with an inertial measurement unit, MetaMotionC, and walked unobserved (at a self-selected pace) for 120 m along an obstacle-free, carpeted hospital corridor. RESULTS LDH, CMLBP, and LSS groups had unique pathological signatures of gait impairment. The LDH group (n = 33) had marked asymmetry in terms of step length, step time, stance, and single-support asymmetry. The LDH group also involved gait variability with increased step length variation. However, distinguishing the CMLBP group (n = 33) was gait variability in terms increased single-support time variation. The gait of participants with LSS (n = 22) was both asymmetric and variable in step length. CONCLUSIONS Wearable sensor-based accelerometry was found to be capable of detecting the gait abnormalities present in patients with LDH, LSS, and CMLBP, when compared to age-matched controls. Objective and quantitative patterns of gait deterioration uniquely varied between these subtypes of lumbar spine disease. With further testing and validation, gait signatures may aid clinical identification of gait-altering pathologies.
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Affiliation(s)
- Pragadesh Natarajan
- Faculty of Medicine, University of New South Wales, Sydney, Australia; NeuroSpine Clinic, Prince of Wales Private Hospital, Randwick, Australia; NeuroSpine Surgery Research Group, Sydney, Australia; Wearables and Gait Assessment Research Group, Sydney, Australia.
| | - R Dineth Fonseka
- Faculty of Medicine, University of New South Wales, Sydney, Australia; NeuroSpine Clinic, Prince of Wales Private Hospital, Randwick, Australia; NeuroSpine Surgery Research Group, Sydney, Australia; Wearables and Gait Assessment Research Group, Sydney, Australia
| | - Luke Wincent Sy
- School of Mathematics, University of New South Wales, Sydney, Australia
| | - Monish Movin Maharaj
- Faculty of Medicine, University of New South Wales, Sydney, Australia; NeuroSpine Clinic, Prince of Wales Private Hospital, Randwick, Australia; NeuroSpine Surgery Research Group, Sydney, Australia; Wearables and Gait Assessment Research Group, Sydney, Australia
| | - Ralph Jasper Mobbs
- Faculty of Medicine, University of New South Wales, Sydney, Australia; NeuroSpine Clinic, Prince of Wales Private Hospital, Randwick, Australia; NeuroSpine Surgery Research Group, Sydney, Australia; Wearables and Gait Assessment Research Group, Sydney, Australia
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Fonseka RD, Natarajan P, Mobbs RJ. Inter-bout and intra-bout gait variability-proposed objective measures of gait deterioration during prolonged walking in spine care. JOURNAL OF SPINE SURGERY (HONG KONG) 2022; 8:180-184. [PMID: 35441111 PMCID: PMC8990389 DOI: 10.21037/jss-21-88] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 09/29/2021] [Indexed: 06/14/2023]
Affiliation(s)
- R. Dineth Fonseka
- Faculty of Medicine, University of New South Wales, Sydney, Australia
- NeuroSpine Surgery Research Group (NSURG), Sydney, Australia
- Wearables and Gait Analysis Research Group (WAGAR), Sydney, Australia
| | - Pragadesh Natarajan
- Faculty of Medicine, University of New South Wales, Sydney, Australia
- NeuroSpine Surgery Research Group (NSURG), Sydney, Australia
- Wearables and Gait Analysis Research Group (WAGAR), Sydney, Australia
| | - Ralph J. Mobbs
- Faculty of Medicine, University of New South Wales, Sydney, Australia
- NeuroSpine Surgery Research Group (NSURG), Sydney, Australia
- Wearables and Gait Analysis Research Group (WAGAR), Sydney, Australia
- Department of Neurosurgery, Prince of Wales Hospital, Sydney, Australia
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Zheng X, Reneman MF, Echeita JA, Schiphorst Preuper RHR, Kruitbosch H, Otten E, Lamoth CJC. Association between central sensitization and gait in chronic low back pain: Insights from a machine learning approach. Comput Biol Med 2022; 144:105329. [DOI: 10.1016/j.compbiomed.2022.105329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 02/14/2022] [Accepted: 02/14/2022] [Indexed: 11/30/2022]
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Geil MD, Rahnama L, Sergeant E, Soulis K, Jarrells J, Poisal M. Influence of non-immersive avatar-based gamification on the Hawthorne Effect in pediatric gait. Gait Posture 2021; 88:122-125. [PMID: 34034023 DOI: 10.1016/j.gaitpost.2021.05.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 04/12/2021] [Accepted: 05/17/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND The Hawthorne Effect occurs when participants alter their behavior when they are aware that they are being examined. The effect has been reported in many experiments, including gait analysis, and is considered an important source of bias that might impact both clinical and research results. Cognitive distraction is one potential solution to reducing the Hawthorne effect during gait analysis, but it is challenging in children, and can, in itself, alter gait. This study investigated the carryover effect of an alternative low-immersion avatar-based intervention on gait and subjective feelings in typically developing children. RESEARCH QUESTION Will a low-immersion avatar-based intervention change feelings and indicators of temporospatial and kinematic outcomes in children in a laboratory setting, potentially reducing the Hawthorne Effect? METHODS Typically developing children aged 5-13 participated in a standard laboratory gait analysis before experiencing a game in which they viewed their motion on monitors around the lab as that of a cartoon avatar in a 3D virtual environment. Following this intervention, standard walking trials were repeated. In addition, participants completed a survey of their feelings about the study both before onset and after completion. RESULTS Thirty-one children participated in the study, 16 females and 15 males, mean aged 9.1 years. Arm swing, proposed as a measure of how relaxed and natural gait was, increased significantly following the intervention, while temporospatial parameters did not. The effect was more pronounced in females and younger children. Participants felt significantly happier, more excited, less scared, and less sad after the intervention. Changes in feelings were not closely associated with changes in gait. SIGNIFICANCE This study suggests that gamification may reduce the Hawthorne effect and potentially produce more natural gait in children. The game intervention had a carryover effect, producing changes in gait even after the intervention was removed.
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Affiliation(s)
- Mark D Geil
- Kennesaw State University, Kennesaw, GA, USA.
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Friesen KB, Zhang Z, Monaghan PG, Oliver GD, Roper JA. All eyes on you: how researcher presence changes the way you walk. Sci Rep 2020; 10:17159. [PMID: 33051502 PMCID: PMC7554041 DOI: 10.1038/s41598-020-73734-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 09/21/2020] [Indexed: 12/30/2022] Open
Abstract
Most human movement research takes place within controlled laboratories where researchers observe participant movement. Because a majority of daily activity is performed without observation, we hypothesized movement within a laboratory would vary when there was a small, large or absence of research group. We also hypothesized that personality type would influence movement during observation. Participants completed a personality questionnaire, then walked in a laboratory during three different conditions: no research group (no researchers), small research group (2 researchers), and large research group (6-10 researchers). Results revealed spatiotemporal parameters were altered between conditions, however personality type did not influence changes in movement. As the number of researchers increased, gait speed, cadence, and stride length increased, and step duration decreased. Gait speed increased by .03 m/s from the no research group to the small research group, by .06 m/s from the no research group to the large research group, and by .03 m/s from the small to large research group (all p values < .001). Understanding how researcher observation modifies movement is important and affects the replicability of results, as well as the interpretation of laboratory-based movement studies to activities of daily living in real world settings.
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Dal-Ré R. Unperceived similarities between clinical trials and quantum physics. Br J Clin Pharmacol 2020; 86:192-193. [PMID: 31943305 DOI: 10.1111/bcp.14126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 09/06/2019] [Indexed: 11/30/2022] Open
Affiliation(s)
- Rafael Dal-Ré
- Epidemiology Unit, Health Research Institute-Fundación Jiménez Díaz University Hospital, Universidad Autónoma de Madrid, Madrid, Spain
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12
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Ardestani MM, Hornby TG. Effect of investigator observation on gait parameters in individuals with stroke. J Biomech 2020; 100:109602. [PMID: 31955871 DOI: 10.1016/j.jbiomech.2020.109602] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 12/06/2019] [Accepted: 12/31/2019] [Indexed: 11/29/2022]
Abstract
Improvements in gait speed following various training paradigms applied to patients post-stroke does not always lead to changes in walking performance, defined as gains in daily stepping activity. We hypothesized that testing conditions, specifically the presence of an observer, influences patient behaviors and resultant outcomes may overestimate their true walking capacity. This potential Hawthorne effect on spatiotemporal and biomechanical measures of locomotor function in individuals post-stroke has not been assessed previously. Fifteen ambulatory individuals with chronic stroke wore instrumented insoles and performed two separate normal-pace walking assessments, including unobserved conditions during which participants were unattended and unaware of data collection, and observed conditions with an investigator present. Gait analysis was conducted outside of a laboratory setting using instrumented insoles equipped with a 3D accelerometer and pressure sensors which captured the spatiotemporal kinematics, vertical ground reaction forces and foot acceleration. Data were compared using paired comparisons, with subsequent correlation and stepwise regression analyses to explore potential associations between Hawthorne-induced changes in walking strategies, gait speed and locomotor performance (daily stepping). Except for cadence, other measures of spatiotemporal parameters and swing kinematics (acceleration) were not significantly different between observed vs unobserved conditions. However, analyses of ground reaction forces revealed significantly greater paretic limb loading (Δ1st peak = 1.5 ± 1.6 N/kg Δ2nd peak = 1.4 ± 1.8 N/kg; p < 0.01) and increases in weight bearing symmetry (11-24%, p < 0.01) during observed vs unobserved conditions. This potential Hawthorne effect was greater in those with slower walking speeds and shorter stride lengths but was not related to daily stepping. The present findings suggest that biomechanical parameters of walking function may be related to the presence of an observer and highlight the need to separately measure locomotor capacity (gait speed) and performance (daily stepping).
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Affiliation(s)
- Marzieh M Ardestani
- Indiana University School of Medicine, Department of Physical Medicine and Rehabilitation, Indianapolis, IN, USA; Rehabilitation Hospital of Indiana, Indianapolis, IN, USA
| | - T George Hornby
- Indiana University School of Medicine, Department of Physical Medicine and Rehabilitation, Indianapolis, IN, USA; Rehabilitation Hospital of Indiana, Indianapolis, IN, USA.
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Hua A, Quicksall Z, Di C, Motl R, LaCroix AZ, Schatz B, Buchner DM. Accelerometer-based predictive models of fall risk in older women: a pilot study. NPJ Digit Med 2018; 1:25. [PMID: 31304307 PMCID: PMC6550179 DOI: 10.1038/s41746-018-0033-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 05/04/2018] [Accepted: 05/10/2018] [Indexed: 11/28/2022] Open
Abstract
Current clinical methods of screening older adults for fall risk have difficulties. We analyzed data on 67 women (mean age = 77.5 years) who participated in the Objective Physical Activity and Cardiovascular Health (OPACH) study within the Women’s Health Initiative and in an accelerometer calibration substudy. Participants completed the short physical performance battery (SPPB), questions about falls in the past year, and a timed 400-m walk while wearing a hip triaxial accelerometer (30 Hz). Women with SPPB ≤ 9 and 1+reported falls (n = 19) were grouped as high fall risk; women with SPPB = 10–12 and 0 reported falls (n = 48) were grouped as low fall risk. Random Forests were trained to classify women into these groups, based upon traditional measures of gait and/or signal-based features extracted from accelerometer data. Eleven models investigated combined feature effects on classification accuracy, using 10-fold cross-validation. The models had an average 73.7% accuracy, 81.1% precision, and 0.706 AUC. The best performing model including triaxial data, cross-correlations, and traditional measures of gait had 78.9% accuracy, 84.4% precision, and 0.846 AUC. Mediolateral signal-based measures—coefficient of variance, cross-correlation with anteroposterior accelerations, and mean acceleration—ranked as the top 3 features. The classification accuracy is promising, given research on probabilistic models of falls indicates accuracies ≥80% are challenging to achieve. The results suggest accelerometer-based measures captured during walking are potentially useful in screening older women for fall risk. We are applying algorithms developed in this paper on an OPACH dataset of 5000 women with a 1-year prospective falls log and week-long, free-living accelerometer data. A hip-worn device that measures walking motion can help identify which older women are at heightened risk for falling. Andrew Hua, from the University of Illinois at Urbana-Champaign, USA, and colleagues put 67 elderly women through a series of tests to assess their lower extremity function. They also asked the study participants about fall histories in the past year and strapped a triaxial accelerometer to the women’s hips while they completed a 400-meter walking test. Analyses showed that the accelerometry data, when fed into a machine-learning algorithm, were predictive of physical ability and fall risk. Based on these results, the researchers are validating the algorithm in a larger study of 5000 women who wore hip accelerometers for a full week and reported falls prospectively for one-year.
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Affiliation(s)
- Andrew Hua
- 1University of Illinois at Urbana-Champaign, Urbana, IL USA
| | - Zachary Quicksall
- 1University of Illinois at Urbana-Champaign, Urbana, IL USA.,2Carl R. Woese Institute for Genomic Biology, Urbana, IL USA
| | - Chongzhi Di
- 3Fred Hutchinson Cancer Research Center, Seattle, WA USA
| | - Robert Motl
- 4University of Alabama at Birmingham, Birmingham, AL USA
| | - Andrea Z LaCroix
- 3Fred Hutchinson Cancer Research Center, Seattle, WA USA.,5University of California at San Diego, San Diego, USA
| | - Bruce Schatz
- 1University of Illinois at Urbana-Champaign, Urbana, IL USA.,2Carl R. Woese Institute for Genomic Biology, Urbana, IL USA
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