Performance fatigability during isometric vs. concentric quadriceps fatiguing tasks in men and women |
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| Affiliation: | 1. Univ Lyon, UJM-Saint-Etienne, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, F-42023 Saint-Etienne, France;2. Université du Québec à Montréal (UQAM), Montréal, Canada;3. Unité de Myologie, Service de Physiologie Clinique et de l’Exercice, Centre Référent Maladies Neuromusculaires Euro-NmD, CHU de Saint-Etienne, France;4. Institut Universitaire de France (IUF), Paris, France;1. Programa de Engenharia Biomédica (COPPE), Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil;2. Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK;3. Department of Clinical and Experimental Sciences, Università degli Studi di Brescia, Brescia, Italy;4. Laboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Politecnico di Torino, Torino, TO, Italy;5. PolitoBIOMed Lab, Politecnico di Torino, Torino, Italy;1. Department of Neurology, University of Colorado Denver, Aurora, CO, USA;2. Colorado School of Public Health-Biostatistics and Informatics, Aurora, CO, USA;3. Department of Neurology, University of Rochester Medical Center Rochester, NY, USA;4. Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA;1. Research Centre on Aging, CIUSSS de l’Estrie - CHUS, Sherbrooke, QC, Canada;2. Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC, Canada;3. School of Rehabilitation, Université de Sherbrooke, Sherbrooke, QC, Canada;4. Department of Health Sciences, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada;5. Research Centre on Health, CIUSSS du Saguenay-Lac-Saint-Jean, Chicoutimi, QC, Canada;1. Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL, Canada;2. Division of Research and Innovation, Canadian Memorial Chiropractic College, Toronto, ON, Canada;1. Department of Sports Medicine and Performance Physiology, Goethe University Frankfurt, Frankfurt, Germany;2. Department of Strength Power and Technical Sports, Institute for Applied Training Science, Leipzig, Germany;3. Department of Engineering and Industrial Design, Magdeburg-Stendal University of Applied Sciences, Magdeburg, Germany;4. Department of Biomechanics, Institute for Applied Training Science, Leipzig, Germany;5. Centre for Human Performance, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia;1. Department of Biomedical Engineering, Lund University, Lund, Sweden;2. Department of Radiation Sciences, Radiation Physics, Biomedical Engineering, Umeå University, Umeå, Sweden |
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| Abstract: | In the present study, we aimed to provide a robust comparison of the fatigability of the knee extensors following isometric (ISO) and concentric (CON) tasks. Twenty young adults (25 ± 4 yr, 10 women) randomly performed the ISO and CON quadriceps intermittent fatigue test, consisting of ten (5 s on/5-s off, ISO) or one-hundred (0.5-s on/0.5-s off, CON) contractions with 10 % increments per stage until exhaustion. Performance fatigability was quantified as maximal isometric (MVIC) and concentric (MVCC) torque loss. Voluntary activation and contractile function (peak-twitch) were investigated using peripheral nerve stimulation. Number of stages (6.2 ± 0.7 vs. 4.9 ± 0.8; P < 0.001) and torque-time integral (20,166 ± 7,821 vs. 11,285 ± 4,933 Nm.s; P < 0.001) were greater for ISO than CON. MVIC, MVCC and voluntary activation decreased similarly between sessions (P > 0.05) whereas peak-twitch amplitude decreased more for CON (P < 0.001). The number of contractions was similar across sexes (ISO: men = 62 ± 8, women = 61 ± 5; CON: men = 521 ± 67, women = 458 ± 76, P > 0.05). MVCC was more reduced in women for both sessions (all P < 0.05), while MVIC loss was similar between sexes. We concluded that, despite greater torque-time integral and duration for ISO, both sessions induced a similar performance fatigability at exhaustion. Contractile function was more altered in CON. Finally, sex-related difference in fatigability depends on the contraction mode used during testing. |
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| Keywords: | Central fatigue Peripheral fatigue Dynamic contractions Isokinetic Sex differences |
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