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- W2955013603 abstract "PURPOSE: The purpose of the present study was to identify the time course of changes in neuromuscular parameters from the vastus lateralis (VL) muscles during fatiguing, bilateral, maximal isokinetic leg extensions. METHODS: Fifteen men (22.3 ± 3.3 yr) performed consecutive, maximal, bilateral, concentric isokinetic leg extensions at 180 ̊ ·s-1 until their peak toque was reduced by 50% (53 ± 17 repetitions). The amplitude (root mean square = RMS) and frequency (mean power frequency = MPF) contents of electromyographic (EMG) and mechanomyographic (MMG) signals from the VL muscles of both legs were recorded simultaneously during each repetition of the fatiguing bout. The EMG RMS, EMG MPF, MMG RMS, and MMG MPF were normalized to their corresponding maximal isometric voluntary contraction values and torque values were normalized to maximal bilateral isokinetic concentric peak torque values at 180 ° ·s-1. The repetitions were normalized to each 10% of the total number of repetitions completed. Four, 2 (right and left VL) x 10 (10-100% of the total repetitions) repeated measures ANOVAs were used to determine mean differences for each neuromuscular parameter. A 1 x 10 repeated measures ANOVA was used to examine torque production. Post-hoc Student Newman-Keuls was used to identify when the neuromuscular and torque values changed from the values at 10% of the total repetitions. RESULTS: The results demonstrated no significant interactions involving the right and left VL muscles or main effects for repetitions for any of the neuromuscular parameters. The maximal bilateral peak torque (311.4 ± 51.2 N·m) decreased significantly (p < 0.01; η2 = 0.688) at 90% of the total repetitions. CONCLUSION: The results of the present study demonstrated no differences between the right and left VL muscles for their patterns of neuromuscular responses during the fatiguing bilateral leg extensions. While peak torque decreased, no changes occurred for any of the neuromuscular parameters across the repetitions. Therefore, the current findings suggested that the decrease in torque production was due to peripheral mechanisms of fatigue and not a decrease in central neural drive to the muscles." @default.
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- W2955013603 date "2019-06-01" @default.
- W2955013603 modified "2023-10-18" @default.
- W2955013603 title "Time Course of Changes in Neuromuscular Parameters During Maximal Bilateral Dynamic Muscle Actions" @default.
- W2955013603 doi "https://doi.org/10.1249/01.mss.0000561542.89544.0a" @default.
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