Changes in muscle activation,oxygenation, and morphology following a fatiguing repetitive forward reaching task in young adult males and females |
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| Institution: | 1. Division of Applied Mechanics, Department of Mechanical Engineering, École Polytechnique, Montréal, Québec, Canada;2. Institut de recherche Robert Sauvé en santé et en sécurité du travail, Montréal, Québec, Canada;1. School of Physical Education, Physical Therapy and Occupational Therapy, Department of Sports, Federal University of Minas Gerais – UFMG, Belo Horizonte, Minas Gerais, Brazil;2. Sports Center, Federal University of Ouro Preto – UFOP, Ouro Preto, Minas Gerais, Brazil;3. Biomedical Engineering Program, Alberto Luiz Coimbra Institute for Graduate Studies and Research in Engineering (PEB/COPPE), Federal University of Rio de Janeiro (UFRJ), Brazil;1. Department of Exercise and Sport Science, High Point University, USA;2. Program in Human Movement Science, High Point University, USA;3. Department of Athletic Training, High Point University, USA;1. Fischell Department of Bioengineering, University of Maryland at College Park, College Park, MD, USA;2. Institute of Rehabilitation Engineering, University of Rehabilitation, Qingdao, China;3. Department of Occupational Science and Technology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA;4. Institute of Medical Research, Northwestern Polytechnical University, Xi’an, ShanXi, China;5. Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, and TIRR Memorial Hermann Research Center, Houston, TX, USA;6. Guangdong Work Injury Rehabilitation Center, Guangzhou, China;1. Neuromuscular Research Laboratory, National Institute of Traumatology and Orthopedics (INTO), Rio de Janeiro, RJ, Brazil;2. Biomechanics Laboratory, EEFD – Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil;3. Centre for Exercise and Sports Science Research (CESSR), School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia |
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| Abstract: | We sought to evaluate sex-specific 1) muscle activation patterns, hemodynamics, and swelling responses to short-cycle repetitive fatigue; 2) relationships between muscular responses and perceived fatigability. Asymptomatic participants (N = 26, 13 females) completed a repetitive pointing task until 8/10 on the Borg CR10 scale. Upper trapezius (UT), supraspinatus (SUPRA), and biceps brachii (BIC) muscle activation, activation variability (CV), median power frequency (MdPF) and thickness, and UT oxygenation were recorded. Males had higher BIC CV, UT and SUPRA MdPF, and UT and BIC thickness. Longer time to fatigue-terminal was correlated to greater SUPRA activation increase (ρ = 0.624) and BIC MdPF decrease (ρ = -0.674) in males, while in females it was correlated to greater (ρ = -0.657) and lower (ρ = 0.683) decrease of SUPRA and BIC CV, respectively. Male’s greater increase in SUPRA thickness correlated to greater increase in UT thickness and tissue oxygenation index, and to lower increase of UT deoxyhemoglobin. Females’ greater decrease of SUPRA MdPF correlated to greater decrease of UT MdPF, while greater UT activation increase was related to lower UT thickness increase. Results suggest that despite comparable time to fatigue-terminal, males have greater force-generating capacity and neuromuscular reliance on recruitment and excitation rates, while females have greater reliance on activation variability. Further, there are relationships between hemodynamic and swelling patterns in males, while there are relationships between activation and swelling patterns in females. Although there were no differences in experimental task-induced changes, there are sex-specific relationships between muscular patterns and perceived fatigability, which may help explain sex-specific mechanisms of musculoskeletal disorders. |
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| Keywords: | Muscle fatigue Muscle oxygenation Motor variability Median power frequency Sex differences |
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