title: Comparison of the effect of selected muscle groups fatigue on postural control during bipedal stance in healthy young women.
abstract: BACKGROUND
  The maintenance of balance is an essential requirement for the performance of daily tasks and sporting activities and muscular fatigue is a factor to impair postural control, so this study was done to compare the effect of selected muscle groups fatigue on postural control during bipedal stance in healthy subjects.
  
  
  METHODS
  Fifteen healthy female students (24.3 ± 2.6 years) completed three testing session with a break period of at least 2 days. During each session, postural control was assessed during two 30-s trials of bipedal stance with eyes close before and after the fatigue protocol. Fatigue protocols were performed by 60% of their unfatigued Maximum Voluntary Contraction of unilateral ankle plantar flexors, bilateral lumbar extensors and bilateral neck extensors. One of the three fatigue protocols was performed on each session.
  
  
  RESULTS
  The result showed that fatigue had a significant effect on COP velocity and it increase COP velocity but there was not found any difference in postural sway between muscle groups.
  
  
  CONCLUSIONS
  Localized muscle fatigue caused deficits in postural control regardless of the location of fatigue. Authors suggest the possibility of the contributions of central mechanisms to postural deficits due to fatigue and it seems that difference was not between muscle groups due to central fatigue.
authors.affiliation: School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Zahra Rojhani
authors.initials: ZR
authors.lastname: Shirazi
authors.affiliation: School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Fatemeh Nikhalat
authors.initials: FN
authors.lastname: Jahromi
keywords: Center of pressure; fatigue; postural control