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

被引：19

作者：

Conchola, Eric C. ^{[1
]}

Thiele, Ryan M. ^{[2
]}

Palmer, Ty B. ^{[3
]}

Smith, Doug B. ^{[2
]}

Thompson, Brennan J. ^{[4
]}

机构：

[1] Oklahoma State Univ, Dept Wellness, Stillwater, OK 74078 USA

[2] Oklahoma State Univ, Dept Hlth & Human Performance, Appl Musculoskeletal & Human Physiol Lab, Stillwater, OK 74078 USA

[3] Kent State Univ, Sch Hlth Sci, Kent, OH 44242 USA

[4] Texas Tech Univ, Dept Hlth Exercise & Sport Sci, Human Performance Lab, Lubbock, TX 79409 USA

来源：

MUSCLE & NERVE | 2015年 / 52卷 / 05期

关键词：

gender; hamstrings; neuromuscular fatigue; quadriceps; recovery; HUMAN SKELETAL-MUSCLE; AGE-RELATED DIFFERENCES; KNEE FLEXORS; TORQUE CHARACTERISTICS; LACTATE ACCUMULATION; ISOMETRIC-EXERCISE; FORCE DEVELOPMENT; SEX-DIFFERENCES; RESPONSE-TIMES; OLD MEN;

D O I：

10.1002/mus.24598

中图分类号：

R74 [神经病学与精神病学];

学科分类号：

100204 [神经病学];

摘要：

Introduction: 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

引用

页码：844 / 851

页数：8

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