The Effects of Gender on Fatigue-Induced Changes in Electromechanical Efficiency and Torque

Ethan C. Hill, Terry J. Housh, Cory M. Smith, Richard J. Schmidt, Glen O. Johnson

Department of Nutrition and Health Sciences, Human Performance Laboratory, University of Nebraska-Lincoln, Lincoln, NE 68505, USA

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Electromechanical efficiency (efficiencyE-M) has been used to detect changes in neuromuscular function and track decreases in torque production as a result of muscle fatigue.  No previous investigations, however, have applied efficiencyE-M to examine gender-specific decreases in torque as a result of fatigue.  Therefore, the purpose of the present investigation was to examine gender differences in the fatigue-related effects on efficiencyE-M (mechanomyographic amplitude ÷ electromyographic amplitude) during repeated, submaximal, concentric forearm flexion muscle actions.  Eleven men and eleven women performed 50 consecutive submaximal (65% of concentric peak torque), concentric muscle actions of the forearm flexors at 60°·s-1.  There were decreases in pretest versus posttest concentric peak torque for both the men (30.5%) and women (22.3%) as a result of the fatiguing exercise bout, but the decrease was greater for the men.  During the fatiguing exercise bout, torque output remained unchanged at 65% of concentric peak torque, while efficiencyE-M decreased for both the men and women.  Thus, efficiencyE-M did not track torque production during the submaximal fatiguing protocol. Journal of Nature and Science (JNSCI), 3(5):e356, 2017

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