Author(s): Ethan Hill, Terry Housh, Cory Smith, Kristen Cochrane, Nathaniel Jenkins, Richard Schmidt and Glen Johnson

Abstract: The purpose of the present investigation was to examine muscle- and mode-specific torque, electromyographic (EMG), and mechanomyographic (MMG) responses of women as a result of a fatiguing, submaximal task. Thirteen women performed concentric peak torque (PT) and isometric maximal voluntary contraction (MVC) trials before (pretest) and after (posttest) performing a fatiguing workbout that consisted of 50 submaximal (65% of PT), concentric, isokinetic (60°•s-1), forearm flexion muscle actions. There were similar decreases in PT (18.4%) and MVC (16.4%) following the fatiguing workbout. From pretest to posttest, there were no changes in EMG amplitude or MMG frequency, but muscle-specific decreases in EMG frequency, and increases in MMG amplitude. In addition, there was a mode-specific (PT > MVC) effect for MMG frequency for both muscles. Thus, in women, the fatigue-related neuromuscular responses were dependent on the muscle and mode of assessment, while torque decreased similarly regardless of mode (concentric vs. isometric).

Pages: 431-438  |  1278 Views  40 Downloads

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