title: Relationships between eccentric hip isokinetic torque and functional performance.
abstract: BACKGROUND
  Recently, attention in sports has been given to eccentric hip-muscle function, both in preventing musculoskeletal injuries and improving performance.
  
  
  OBJECTIVE
  To determine the key isokinetic variables of eccentric hip torque that predict the functional performance of women in the single-leg triple long jump (TLJ) and the timed 6-m single-leg hop (TH).
  
  
  METHODS
  Within-subject correlational study.
  
  
  METHODS
  Musculoskeletal laboratory.
  
  
  METHODS
  32 healthy women age 18-25 y.
  
  
  METHODS
  The participants performed 2 sets of 5 eccentric hip-abductor/adductor and lateral/medial-rotator isokinetic contractions (30°/s) and 3 attempts in the TLJ and TH.
  
  
  METHODS
  The independent variables were the eccentric hip-abductor and -adductor and medial- and lateral-rotator isokinetic peak torque, normalized according to body mass (Nm/kg). The dependent variables were the longest distance achieved in the TLJ normalized according to body height and the shortest time spent during the execution of the TH.
  
  
  RESULTS
  The forward-stepwise-regression analysis showed that the combination of the eccentric hip lateral-rotator and -abductor isokinetic peak torque provided the most efficient estimate of both functional tests, explaining 65% of the TLJ variance (P < .001) and 55% of the TH variance (P < .001).
  
  
  CONCLUSIONS
  Higher values for eccentric hip lateral-rotator and hip-abductor torques reflected better performance. Thus, the eccentric action of these muscles should be considered in the development of physical training programs that aim to increase functional performance.
authors.affiliation: Department of Physiotherapy, São Carlos Federal University, São Carlos, São Paulo, Brazil.
authors.forename: Rodrigo de Marche
authors.initials: Rde M
authors.lastname: Baldon
authors.forename: Ferreira Moreira
authors.initials: FM
authors.lastname: Lobato D
authors.forename: Lívia Pinheiro
authors.initials: LP
authors.lastname: Carvalho
authors.forename: Yan Lam
authors.initials: YL
authors.lastname: Wun P
authors.forename: Cátia Valéria
authors.initials: CV
authors.lastname: Presotti
authors.forename: Fábio Viadanna
authors.initials: FV
authors.lastname: Serrão
mesh_terms: D000293:Adolescent; D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D005260:Female; D006615:Hip / Q000502:physiology*; D006801:Humans; D007866:Leg / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology; D016059:Range of Motion, Articular / Q000502:physiology; D019415:Torque; D055815:Young Adult