Performance fatigability and neuromuscular responses for bilateral versus unilateral leg extensions in women |
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| Affiliation: | 1. Department of Nutrition and Human Sciences, University of Nebraska- Lincoln, Lincoln, NE 68510, USA;2. College of Health Sciences, Kinesiology, University of Texas at El Paso, El Paso, TX 39968, USA;3. School of Kinesiology and Physical Therapy, Division of Kinesiology University of Central Florida, Orlando, FL 32816, USA;1. Department of Biomechanics in Sports, Technical University Munich, Germany;2. Centre for Sensorimotor Performance, The University of Queensland, Australia;3. Human Movement Science, Bundeswehr University Munich, Germany;1. University of Nebraska – Lincoln, United States;2. Northern Illinois University, United States;3. University of Kentucky, United States;4. Oklahoma State University, United States;5. University of Nebraska-Omaha, United States;6. Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Chile;1. Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA, USA;2. University of Potsdam, Department of Sports and Health Sciences, University Outpatient Clinic, Potsdam, Germany;1. Sport Sciences – Performance and Technology, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark;2. Department of Occupational and Environmental Medicine, Danish Ramazzini Centre, Aalborg University Hospital, Aalborg, Denmark;1. The University of Mississippi, Department of Health, Exercise Science, and Recreation Management, University, MS 38677, USA;2. The University of Oklahoma, Department of Health and Exercise Science, Norman, OK 73019, USA |
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| Abstract: | The purpose of this study was to compare isokinetic peak torque and the patterns of responses for electromyographic (EMG) and mechanomyographic (MMG), amplitude (AMP) and mean power frequency (MPF) for bilateral (BL) versus unilateral (UL), maximal, isokinetic leg extensions. Eleven recreationally trained women (Mean ± SD: age 22.9 ± 0.9 yrs; body mass 60.5 ± 10.1 kg; height 167.2 ± 6.4 cm) performed 50 maximal, BL and UL isokinetic leg extensions at 60° s−1 on separate days. Electromyographic and MMG signals from the vastus lateralis of the nondominant leg were recorded. Five separate 2 (Condition [BL and UL]) × 10 (Repetitions [5–50]) repeated measures ANOVAs were performed to examine normalized EMG AMP, EMG MPF, MMG AMP, MMG MPF, and isokinetic torque. The results indicated no significant interactions or main effects for EMG AMP and MMG AMP. There were significant interactions for normalized isokinetic peak torque (p < 0.001, η2p = 0.493) and MMG MPF (p = 0.003, η2p = 0.234). For EMG MPF, there was no significant interaction, but significant main effects for Condition (p = 0.003, η2p = 0.607) and Repetitions (p < 0.001, η2p = 0.805). The current findings demonstrated greater performance fatigability for UL than BL leg extensions. Both modalities exhibited similar patterns of neuromuscular responses that were consistent with the Muscular Wisdom hypothesis. |
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