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

Eric C. Conchola, Ryan M. Thiele, Ty B. Palmer, Doug B. Smith, Brennan J. Thompson

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)844-851
Number of pages8
JournalMuscle and Nerve
Volume52
Issue number5
DOIs
StatePublished - Nov 2015

Keywords

  • Gender
  • Hamstrings
  • Neuromuscular fatigue
  • Quadriceps
  • Recovery

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