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Griffith G, Lamotte G, Mehta N, Fan P, Nikolich J, Springman V, Suttman E, Joslin E, Balfany K, Dunlap M, Kohrt WM, Christiansen CL, Melanson EL, Josbeno D, Chahine LM, Patterson CG, Corcos DM. Chronotropic Incompetence During Exercise Testing as a Marker of Autonomic Dysfunction in Individuals with Early Parkinson's Disease. J Parkinsons Dis 2024; 14:121-133. [PMID: 38189712 PMCID: PMC10836543 DOI: 10.3233/jpd-230006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/19/2023] [Indexed: 01/09/2024]
Abstract
BACKGROUND An attenuated heart rate response to exercise, termed chronotropic incompetence, has been reported in Parkinson's disease (PD). Chronotropic incompetence may be a marker of autonomic dysfunction and a cause of exercise intolerance in early stages of PD. OBJECTIVE To investigate the relationship between chronotropic incompetence, orthostatic blood pressure change (supine - standing), and exercise performance (maximal oxygen consumption, VO2peak) in individuals with early PD within 5 years of diagnosis not on dopaminergic medications. METHODS We performed secondary analyses of heart rate and blood pressure data from the Study in Parkinson's Disease of Exercise (SPARX). RESULTS 128 individuals were enrolled into SPARX (63.7±9.3 years; 57.0% male, 0.4 years since diagnosis [median]). 103 individuals were not taking chronotropic medications, of which 90 had a normal maximal heart rate response to exercise testing (155.3±14.0 bpm; PDnon-chrono) and 13 showed evidence of chronotropic incompetence (121.3±11.3 bpm; PDchrono, p < 0.05). PDchrono had decreased VO2peak compared to PDnon-chrono (19.7±4.5 mL/kg/min and 24.3±5.8 mL/kg/min, respectively, p = 0.027). There was a positive correlation between peak heart rate during exercise and the change in systolic blood pressure from supine to standing (r = 0.365, p < 0.001). CONCLUSIONS A subgroup of individuals with early PD not on dopaminergic medication had chronotropic incompetence and decreased VO2peak, which may be related to autonomic dysfunction. Evaluation of both heart rate responses to incremental exercise and orthostatic vital signs may serve as biomarkers of early autonomic impairment and guide treatment. Further studies should investigate whether cardiovascular autonomic dysfunction affects the ability to exercise and whether exercise training improves autonomic dysfunction.
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Affiliation(s)
- Garett Griffith
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA
| | - Guillaume Lamotte
- Department of Neurology, University of Utah, Salt Lake City, UT, USA
| | - Niyati Mehta
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA
| | - Peng Fan
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA
| | - Juliana Nikolich
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA
| | - Victoria Springman
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA
| | - Erin Suttman
- Department of Neurology, University of Utah, Salt Lake City, UT, USA
| | - Elizabeth Joslin
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA
| | - Katherine Balfany
- School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | | | - Wendy M. Kohrt
- School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
- Eastern Colorado Veterans Affairs Geriatric Research, Education, and Clinical Center, Denver, CO, USA
| | - Cory L. Christiansen
- School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
- Eastern Colorado Veterans Affairs Geriatric Research, Education, and Clinical Center, Denver, CO, USA
| | - Edward L. Melanson
- School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
- Eastern Colorado Veterans Affairs Geriatric Research, Education, and Clinical Center, Denver, CO, USA
| | - Deborah Josbeno
- Department of Physical Therapy, University of Pittsburgh, Pittsburgh, PA, USA
| | - Lana M. Chahine
- Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Daniel M. Corcos
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA
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Patterson CG, Joslin E, Gil AB, Spigle W, Nemet T, Chahine L, Christiansen CL, Melanson E, Kohrt WM, Mancini M, Josbeno D, Balfany K, Griffith G, Dunlap MK, Lamotte G, Suttman E, Larson D, Branson C, McKee KE, Goelz L, Poon C, Tilley B, Kang UJ, Tansey MG, Luthra N, Tanner CM, Haus JM, Fantuzzi G, McFarland NR, Gonzalez-Latapi P, Foroud T, Motl R, Schwarzschild MA, Simuni T, Marek K, Naito A, Lungu C, Corcos DM. Study in Parkinson's disease of exercise phase 3 (SPARX3): study protocol for a randomized controlled trial. Trials 2022; 23:855. [PMID: 36203214 PMCID: PMC9535216 DOI: 10.1186/s13063-022-06703-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 09/01/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND To date, no medication has slowed the progression of Parkinson's disease (PD). Preclinical, epidemiological, and experimental data on humans all support many benefits of endurance exercise among persons with PD. The key question is whether there is a definitive additional benefit of exercising at high intensity, in terms of slowing disease progression, beyond the well-documented benefit of endurance training on a treadmill for fitness, gait, and functional mobility. This study will determine the efficacy of high-intensity endurance exercise as first-line therapy for persons diagnosed with PD within 3 years, and untreated with symptomatic therapy at baseline. METHODS This is a multicenter, randomized, evaluator-blinded study of endurance exercise training. The exercise intervention will be delivered by treadmill at 2 doses over 18 months: moderate intensity (4 days/week for 30 min per session at 60-65% maximum heart rate) and high intensity (4 days/week for 30 min per session at 80-85% maximum heart rate). We will randomize 370 participants and follow them at multiple time points for 24 months. The primary outcome is the Movement Disorders Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) motor score (Part III) with the primary analysis assessing the change in MDS-UPDRS motor score (Part III) over 12 months, or until initiation of symptomatic antiparkinsonian treatment if before 12 months. Secondary outcomes are striatal dopamine transporter binding, 6-min walk distance, number of daily steps, cognitive function, physical fitness, quality of life, time to initiate dopaminergic medication, circulating levels of C-reactive protein (CRP), and brain-derived neurotrophic factor (BDNF). Tertiary outcomes are walking stride length and turning velocity. DISCUSSION SPARX3 is a Phase 3 clinical trial designed to determine the efficacy of high-intensity, endurance treadmill exercise to slow the progression of PD as measured by the MDS-UPDRS motor score. Establishing whether high-intensity endurance treadmill exercise can slow the progression of PD would mark a significant breakthrough in treating PD. It would have a meaningful impact on the quality of life of people with PD, their caregivers and public health. TRIAL REGISTRATION ClinicalTrials.gov NCT04284436 . Registered on February 25, 2020.
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Affiliation(s)
- Charity G. Patterson
- Department of Physical Therapy, University of Pittsburgh, School of Health and Rehabilitation Sciences, 100 Technology Drive, Suite 500, Pittsburgh, PA 15219 USA
| | - Elizabeth Joslin
- Department of Physical Therapy and Human Science, Northwestern University, Feinberg School of Medicine, Suite 1100, 645 North Michigan Avenue, Chicago, IL 60305 USA
| | - Alexandra B. Gil
- Department of Physical Therapy, University of Pittsburgh, School of Health and Rehabilitation Sciences, 100 Technology Drive, Suite 500, Pittsburgh, PA 15219 USA
| | - Wendy Spigle
- Department of Physical Therapy, University of Pittsburgh, School of Health and Rehabilitation Sciences, 100 Technology Drive, Suite 500, Pittsburgh, PA 15219 USA
| | - Todd Nemet
- Department of Physical Therapy, University of Pittsburgh, School of Health and Rehabilitation Sciences, 100 Technology Drive, Suite 500, Pittsburgh, PA 15219 USA
| | - Lana Chahine
- Department of Neurology, University of Pittsburgh, School of Medicine, 3471 Fifth Avenue, Pittsburgh, PA 15213 USA
| | - Cory L. Christiansen
- Department of Physical Medicine & Rehabilitation, University of Colorado, School of Medicine, Aurora, CO 80217 USA
| | - Ed Melanson
- Division of Endocrinology, Metabolism and Diabetes, and Division of Geriatric Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO USA
- Eastern Colorado VA Health Care System, Geriatric Research Education and Clinical Center (GRECC), Denver, CO USA
| | - Wendy M. Kohrt
- Division of Geriatric Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO USA
- Eastern Colorado Geriatric Research, Education, and Clinical Center, Rocky Mountain Regional VAMC, Aurora, USA
| | - Martina Mancini
- Department of Neurology, Oregon Health & Science University, 3181 SW Sam Jackson Road, Portland, OR 97219 USA
| | - Deborah Josbeno
- Department of Physical Therapy, University of Pittsburgh, School of Health and Rehabilitation Sciences, 100 Technology Drive, Suite 500, Pittsburgh, PA 15219 USA
| | - Katherine Balfany
- Department of Physical Medicine & Rehabilitation, University of Colorado, School of Medicine, Aurora, CO 80217 USA
| | - Garett Griffith
- Department of Physical Therapy and Human Science, Northwestern University, Feinberg School of Medicine, Suite 1100, 645 North Michigan Avenue, Chicago, IL 60305 USA
| | - Mac Kenzie Dunlap
- Neurological Institute, Cleveland Clinic, 9500 Euclid Ave, Cleveland, OH 44195 USA
| | - Guillaume Lamotte
- Movement Disorders Division, Department of Neurology, University of Utah, 175 Medical Dr N, Salt Lake City, UT 84132 USA
| | - Erin Suttman
- Department of Physical Therapy & Athletic Training, University of Utah, 520 Wakara Way, Salt Lake City, UT 84115 USA
| | - Danielle Larson
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Suite 115, 710 N Lake Shore Drive, Chicago, IL 60611 USA
| | - Chantale Branson
- Morehouse School of Medicine, 720 Westview Dr SW, Atlanta, GA 30310 USA
| | - Kathleen E. McKee
- Neurosciences Clinical Program, Intermountain Healthcare, 5171 S Cottonwood Street, Suite 810, Murray, UT 84107 USA
| | - Li Goelz
- Department of Kinesiology and Nutrition, UIC College of Applied Health Sciences, 919 W Taylor Street, Chicago, IL 60612 USA
| | - Cynthia Poon
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Suite 115, 710 N Lake Shore Drive, Chicago, IL 60611 USA
| | - Barbara Tilley
- Department of Biostatistics and Data Science, University of Texas Health Science Center School of Public Health, 1200 Pressler Street E835, Houston, TX 77030 USA
| | - Un Jung Kang
- NYU Langone Health, NYU Grossman School of Medicine, 435 E 30th Street, Science Building 1305, New York, NY 10016 USA
| | - Malú Gámez Tansey
- Department of Neuroscience and Neurology, Normal Fixel Institute for Neurological Diseases and College of Medicine, University of Florida, 4911 Newell Road, Gainesville, FL 32610 USA
| | - Nijee Luthra
- Department of Neurology, Weill Institute for Neurosciences, University of California San Francisco, 1651 4th Street, San Francisco, CA 94158 USA
| | - Caroline M. Tanner
- Department of Neurology, Weill Institute for Neurosciences, University of California San Francisco, 1651 4th Street, San Francisco, CA 94158 USA
| | - Jacob M. Haus
- School of Kinesiology, University of Michigan, 830 N. University Ave, Ann Arbor, MI 48109 USA
| | - Giamila Fantuzzi
- Department of Kinesiology and Nutrition, UIC College of Applied Health Sciences, 919 W Taylor Street, Chicago, IL 60612 USA
| | - Nikolaus R. McFarland
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, College of Medicine, University of Florida, Gainesville, FL 32608 USA
| | - Paulina Gonzalez-Latapi
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Suite 115, 710 N Lake Shore Drive, Chicago, IL 60611 USA
| | - Tatiana Foroud
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, 410 W. 10th Street, Indianapolis, IN 46220 USA
| | - Robert Motl
- Department of Kinesiology and Nutrition, UIC College of Applied Health Sciences, 919 W Taylor Street, Chicago, IL 60612 USA
| | - Michael A. Schwarzschild
- Mass General Institute for Neurodegenerative Disease, Massachusetts General Hospital, Rm 3002, 114 16th Street, Boston, MA 02129 USA
| | - Tanya Simuni
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Suite 115, 710 N Lake Shore Drive, Chicago, IL 60611 USA
| | - Kenneth Marek
- Institute for Neurodegenerative Disorders, 60 Temple St, New Haven, CT 06510 USA
| | - Anna Naito
- Parkinson’s Foundation 200 SE 1st Street Suite 800, Miami, FL 33131 USA
| | - Codrin Lungu
- National Institute of Neurological Disorders and Stroke, NIH, 6001 Executive Blvd, #2188, Rockville, MD 20852 USA
| | - Daniel M. Corcos
- Department of Physical Therapy and Human Science, Northwestern University, Feinberg School of Medicine, Suite 1100, 645 North Michigan Avenue, Chicago, IL 60305 USA
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Lockie RG, Dawes JJ, Moreno MR, Cesario KA, Balfany K, Stierli M, Dulla JM, Orr RM. Relationship Between the 20-m Multistage Fitness Test and 2.4-km Run in Law Enforcement Recruits. J Strength Cond Res 2021; 35:2756-2761. [PMID: 31268997 DOI: 10.1519/jsc.0000000000003217] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
ABSTRACT Lockie, RG, Dawes, JJ, Moreno, MR, Cesario, KA, Balfany, K, Stierli, M, Dulla, JM, and Orr, RM. Relationship between the 20-m multistage fitness test and 2.4-km run in law enforcement recruits. J Strength Cond Res 35(10): 2756-2761, 2021-In the United States, the 2.4-km run is arguably the most common law enforcement aerobic assessment. Potential limitations are that recruits use an internal pacing strategy, the test requires fewer direction changes, and less-fit recruits run for longer. The 20-m multistage fitness test (20MSFT) is commonly used internationally to assess aerobic fitness in law enforcement recruits and provides an external pacing strategy. This study documented sex differences between the 2.4-km run and 20MSFT in law enforcement recruits, and between-test relationships. Retrospective analysis on 8 academy classes (463 men and 87 women) from 1 agency was conducted. The 20MSFT was completed before academy and the 2.4-km run in the first week. Between-sex comparisons in the 2.4-km run and 20MSFT were conducted with independent-samples t-tests and effect sizes. Estimated V̇o2max from the tests was compared with paired-samples t-tests. Correlations and linear regression calculated 2.4-km run and 20MSFT relationships. There were significant between-sex differences for the 2.4-km run and 20MSFT (p < 0.01), with moderate (d = 0.9) and small (d = 0.4) effects, respectively. Estimated 2.4-km run V̇o2max was greater than that from the 20MSFT (p < 0.01). The 2.4-km run had significant relationships with the 20MSFT (r = -0.6), although the regression equations were low (r2 = 0.30-0.37). Between-sex differences in the 20MSFT seemed less than for those in the 2.4-km run. Nonetheless, even with significant relationships between the tests, the 20MSFT induces a higher running intensity and direction changes. This may limit transferability with the 2.4-km run in law enforcement recruits.
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Affiliation(s)
- Robert G Lockie
- Department of Kinesiology, California State University Fullerton, Fullerton, California
| | - J Jay Dawes
- Department of Health Sciences, University of Colorado-Colorado Springs, Colorado Springs, Colorado
| | - Matthew R Moreno
- Department of Kinesiology, California State University Fullerton, Fullerton, California
| | - Karly A Cesario
- Department of Kinesiology, California State University Fullerton, Fullerton, California
| | - Katherine Balfany
- Department of Kinesiology, California State University Fullerton, Fullerton, California
| | - Michael Stierli
- Sydney Police Center, Surry Hills, New South Wales, Australia
| | - Joseph M Dulla
- Recruit Training Unit, Training Bureau, Los Angeles County Sheriff's Department, Los Angeles, California; and
| | - Robin M Orr
- Tactical Research Unit, Bond University, Robina, Queensland, Australia
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Lockie RG, Moreno MR, Ducheny SC, Orr RM, Dawes JJ, Balfany K. Analyzing the Training Load Demands, and Influence of Sex and Body Mass, on the Tactical Task of a Casualty Drag via Surface Electromyography Wearable Technology. Int J Exerc Sci 2020; 13:1012-1027. [PMID: 32922638 PMCID: PMC7449319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This study measured the training load (TL) demands associated with a military-specific casualty drag measured via surface electromyography (sEMG) wearable technology, and the influence of sex and body mass on these measures. Thirty-six college-aged participants (males = 25; females = 11) performed two trials of a 123-kg (91-kg dummy with 32-kg load) backwards casualty drag over 15 m. Time was recorded to calculate drag velocity, with the fastest trial analyzed. Prior to testing, participants were fitted with compression garments embedded with sensors to measure the vastus lateralis and medialis (quadriceps; QUAD), biceps femoris (BF), and gluteus maximus (GM) of both legs. The sEMG signal for each muscle was measured as a percentage of maximal voluntary contraction to calculate TL. The variables included TL (total, QUAD, BF, GM), and between-muscle ratios. The sample was also ranked and median split via body mass into heavier and lighter groups. Independent samples t-tests calculated differences between drag velocity and TL for the sex and body mass groups. Pearson's correlations calculated relationships between body mass and velocity with the TL variables (combined, males, females). Females and lighter participants experienced greater TL compared to males and heavier participants, respectively (p < 0.01). A slower drag velocity correlated with a greater total and QUAD TL for all participants, males, and females (p ≤ 0.03, r = -0.65-0.80). Performing a slower casualty drag will increase TL demands, predominantly via QUAD stress. Training staff should develop the muscles important for the drag, especially for females and lighter males.
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Affiliation(s)
- Robert G Lockie
- Center for Sport Performance, Department of Kinesiology, California State University-Fullerton, Fullerton, CA, USA
| | - Matthew R Moreno
- Center for Sport Performance, Department of Kinesiology, California State University-Fullerton, Fullerton, CA, USA
| | - Spencer C Ducheny
- Center for Sport Performance, Department of Kinesiology, California State University-Fullerton, Fullerton, CA, USA
| | - Robin M Orr
- Tactical Research Unit, Bond University, Robina, Qld, AUSTRALIA
| | - J Jay Dawes
- School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, USA
| | - Katherine Balfany
- Athos, dba Mad Apparel, Redwood City, CA, USA
- Department of Physical Medicine and Rehabilitation, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA
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Balfany K, Chan MS(M, Lockie RG, Lynn SK. Sports Performance Wearable Technology, sEMG, and Manual Muscle Testing: Practical Methods for Measuring Maximal Voluntary Contractions. Med Sci Sports Exerc 2019. [DOI: 10.1249/01.mss.0000560603.40907.81] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lockie RG, Balfany K, Bloodgood AM, Moreno MR, Cesario KA, Dulla JM, Dawes JJ, Orr RM. The Influence of Physical Fitness on Reasons for Academy Separation in Law Enforcement Recruits. Int J Environ Res Public Health 2019; 16:ijerph16030372. [PMID: 30699898 PMCID: PMC6388251 DOI: 10.3390/ijerph16030372] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 01/23/2019] [Accepted: 01/27/2019] [Indexed: 11/16/2022]
Abstract
This study analyzed the effects physical fitness may have on reasons for academy separation in law enforcement recruits. A retrospective analysis was conducted on 401 recruits; 330 recruits graduated (GRAD), and 71 recruits separated at various times during academy. Twenty-eight recruits separated for personal reasons (SEPPR); 18 due to physical training failures (i.e., poor fitness) or injury (SEPFI); and 25 due to academic or scenario failures (SEPAS). Fitness testing occurred prior to academy, and included: Push-ups and sit-ups in 60s; a 75-yard pursuit run (75PR); vertical jump; medicine ball throw; and multistage fitness test (MSFT). A one-way ANOVA with Bonferroni post hoc compared between-group fitness test performance. A multiple stepwise regression calculated whether recruit characteristics or fitness could predict separation. The GRAD group was younger than the SEPAS group (p < 0.01), faster in the 75PR than the SEPFI group (p = 0.02), and completed more MSFT shuttles than the SEPPR and SEPFI groups (p = 0.01). Age predicted GRAD and SEPAS group inclusion; MSFT predicted GRAD, SEPPR, and SEPFI group inclusion. Recruits who had superior high-intensity running capacity (75PR) and aerobic fitness (MSFT) should have a better chance of completing academy. However, this could be influenced by training practices adopted during academy.
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Affiliation(s)
- Robert G Lockie
- Department of Kinesiology, California State University, Fullerton, Fullerton, CA 92831, USA.
| | - Katherine Balfany
- Department of Kinesiology, California State University, Fullerton, Fullerton, CA 92831, USA.
| | - Ashley M Bloodgood
- Department of Kinesiology, California State University, Fullerton, Fullerton, CA 92831, USA.
| | - Matthew R Moreno
- Department of Kinesiology, California State University, Fullerton, Fullerton, CA 92831, USA.
| | - Karly A Cesario
- Department of Kinesiology, California State University, Fullerton, Fullerton, CA 92831, USA.
| | - Joseph M Dulla
- Recruit Training Unit, Training Bureau, Los Angeles County Sheriff's Department, Los Angeles, CA 90022, USA.
| | - J Jay Dawes
- Department of Health Sciences, University of Colorado-Colorado Springs, Colorado Springs, CO 80918, USA.
| | - Robin M Orr
- Tactical Research Unit, Bond University, Robina 4229, QLD, Australia.
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Lynn SK, Watkins CM, Wong MA, Balfany K, Feeney DF. Validity and Reliability of Surface Electromyography Measurements from a Wearable Athlete Performance System. J Sports Sci Med 2018; 17:205-215. [PMID: 29769821 PMCID: PMC5950737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 02/27/2018] [Indexed: 06/08/2023]
Abstract
The Athos ® wearable system integrates surface electromyography (sEMG ) electrodes into the construction of compression athletic apparel. The Athos system reduces the complexity and increases the portability of collecting EMG data and provides processed data to the end user. The objective of the study was to determine the reliability and validity of Athos as compared with a research grade sEMG system. Twelve healthy subjects performed 7 trials on separate days (1 baseline trial and 6 repeated trials). In each trial subjects wore the wearable sEMG system and had a research grade sEMG system's electrodes placed just distal on the same muscle, as close as possible to the wearable system's electrodes. The muscles tested were the vastus lateralis (VL), vastus medialis (VM), and biceps femoris (BF). All testing was done on an isokinetic dynamometer. Baseline testing involved performing isometric 1 repetition maximum tests for the knee extensors and flexors and three repetitions of concentric-concentric knee flexion and extension at MVC for each testing speed: 60, 180, and 300 deg/sec. Repeated trials 2-7 each comprised 9 sets where each set included three repetitions of concentric-concentric knee flexion-extension. Each repeated trial (2-7) comprised one set at each speed and percent MVC (50%, 75%, 100%) combination. The wearable system and research grade sEMG data were processed using the same methods and aligned in time. The amplitude metrics calculated from the sEMG for each repetition were the peak amplitude, sum of the linear envelope, and 95th percentile. Validity results comprise two main findings. First, there is not a significant effect of system (Athos or research grade system) on the repetition amplitude metrics (95%, peak, or sum). Second, the relationship between torque and sEMG is not significantly different between Athos and the research grade system. For reliability testing, the variation across trials and averaged across speeds was 0.8%, 7.3%, and 0.2% higher for Athos from BF, VL and VM, respectively. Also, using the standard deviation of the MVC normalized repetition amplitude, the research grade system showed 10.7% variability while Athos showed 12%. The wearable technology (Athos) provides sEMG measures that are consistent with controlled, research grade technologies and data collection procedures.
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Affiliation(s)
- Scott K Lynn
- Center for Sport Performance, Department of Kinesiology, California State University Fullerton, Fullerton, CA, USA
| | - Casey M Watkins
- Aukland University of Technology, Strength and Conditioning, Auckland, NZ
| | | | - Katherine Balfany
- Center for Sport Performance, Department of Kinesiology, California State University Fullerton, Fullerton, CA, USA
| | - Daniel F Feeney
- Department of Integrative Physiology, University of Colorado, Boulder, CO, USA
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Balfany K, Beitzel MM, Wilson KS. Physical Activity Postings On Social Media. Med Sci Sports Exerc 2018. [DOI: 10.1249/01.mss.0000536106.35552.b4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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