title: Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women.
abstract: BACKGROUND
  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.
  
  
  CONCLUSIONS
  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.
authors: Department of Wellness, Oklahoma State University, Stillwater, Oklahoma, USA.
authors: Eric C
authors: EC
authors: Conchola
authors: Applied Musculoskeletal and Human Physiology Laboratory, Department of Health and Human Performance, Oklahoma State University, Stillwater, Oklahoma, USA.
authors: Ryan M
authors: RM
authors: Thiele
authors: School of Health Sciences, Kent State University, Kent, Ohio, USA.
authors: Ty B
authors: TB
authors: Palmer
authors: Applied Musculoskeletal and Human Physiology Laboratory, Department of Health and Human Performance, Oklahoma State University, Stillwater, Oklahoma, USA.
authors: Doug B
authors: DB
authors: Smith
authors: Human Performance Laboratory, Department of Health, Exercise and Sport Sciences, Texas Tech University, Lubbock, Texas, 79409, USA.
authors: Brennan J
authors: BJ
authors: Thompson
mesh_terms: D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D004576:Electromyography / Q000379:methods; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D007866:Leg / Q000502:physiology*; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D055815:Young Adult
keywords: gender; hamstrings; neuromuscular fatigue; quadriceps; recovery