Neuromuscular fatigue following low-intensity dynamic exercise with externally applied vascular restriction |
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| Authors: | Murat Karabulut Joel T Cramer Takashi Abe Yoshiaki Sato Michael G Bemben |
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| Institution: | 1. Research Centre in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto, Portugal;2. Department of Physiology and Cardiothoracic Surgery, Cardiovascular R&D Unit, Faculty of Medicine, University of Porto, Portugal;3. Faculty of Health Sciences, University of Fernando Pessoa, Portugal;4. Centre for Neurosciences and Cell Biology, Department of Life Sciences, University of Coimbra, Portugal;5. Department of Physiology and Immunology, Faculty of Biology, University of Barcelona, Spain;1. Department of Health and Exercise Science, Neuromuscular Research Laboratory, University of Oklahoma, Norman, OK, USA;2. Department of Physical Education, Kinanthropometry and Human Performance Laboratory, Federal University of Paraíba, João Pessoa, PB, Brazil;3. Study and Research Group in Biomechanics and Psychophysiology of Exercise, Federal Institute of Education, Science and Technology of Rio Grande do Norte, Currais Novos, RN, Brazil |
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| Abstract: | This study investigated neuromuscular fatigue following low-intensity resistance exercise with vascular restriction (VR) and without vascular restriction (control, CON). Fourteen males participated in two experimental trials (VR and CON) each separated by 48 h. Each participant performed two isometric maximum voluntary contractions (MVCs) before and after five sets of 20 dynamic constant external resistance leg extension exercises (DCER-EX) at 20% of one-repetition maximum (1-RM). The participants were asked to lift (1.5 s) and lower (1.5 s) the load at a constant velocity. Surface electromyography (EMG) was recorded from the vastus lateralis during MVC and DCER-EX. Twitch interpolation was used to assess the percent of maximal voluntary activation (%VA) during the MVC. During performing five sets of 20 DCER-EX, the increases (p < 0.05) in EMG amplitude and decreases (p < 0.05) in EMG mean power frequency were similar for both VR and CON. However, there were significant differences between VR and CON for MVC force, %VA, and potentiated twitch force and significant interactions for EMG amplitude. VR decreased MVC force, %VA, potentiated twitch force, and EMG amplitude more than CON. Our findings suggest that the VR-induced fatigue may have been due to a combination of peripheral (decreases in potentiated twitch) and central (decreases in %VA and EMG amplitude) fatigue. |
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