Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women

E-ISSN： 1097-4598|52|5|844-851

ISSN： 0148-639x

Source： MUSCLE AND NERVE, Vol.52, Iss.5, 2015-11, pp. : 844-851

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Abstract

ABSTRACTIntroduction: We examined the effects of neuromuscular fatigue on volitional electromechanical delay (EMD) of leg extensors and flexors between genders. Methods: Twenty‐one men and 20 women performed 2 maximal voluntary contractions (MVCs), followed by intermittent isometric contractions of leg extensors and flexors using a 0.6 duty cycle (6‐s contraction, 4‐s relaxation) at 50% of MVC until volitional fatigue was achieved. MVCs were again performed at 0, 7, 15, and 30 min post‐fatigue. Results: EMD was greater compared with baseline at all post‐fatigue time phases for the leg flexors (P = 0.001–0.007), while EMD was greater at Post0, Post15 and Post30 (P = 0.001–0.023) for the leg extensors. EMD was also greater for leg extensors compared with leg flexors only at Post0. Conclusion: No differential gender‐related fatigue effects on EMD were shown. There were different fatigue‐induced responses between leg extensors and flexors, with leg extensors exhibiting higher EMD immediately post‐fatigue. Muscle Nerve52: 844–851, 2015