title: Angle-specific eccentric hamstring fatigue after simulated soccer.
abstract: OBJECTIVE
  To evaluate the effect of simulated soccer on the hamstrings eccentric torque-angle profile and angle of peak torque (APTeccH), and on the hamstrings:quadriceps torque ratio at specific joint angles (ASHecc:Qcon).
  
  
  METHODS
  The authors assessed dominant-limb isokinetic concentric and eccentric knee flexion and concentric knee extension at 120°/s in 9 semiprofessional male soccer players immediately before and after they completed the Loughborough Intermittent Shuttle Test (LIST).
  
  
  RESULTS
  The LIST resulted in significant decreases in eccentric hamstrings torque at 60°, 50°, and 10° and a significant (21.8%) decrease in ASHecc:Qcon at 10° (P < .05). APTeccH increased from 7.1° ± 1.0° to 18.8° ± 4.2° (P < .05). Eccentric hamstrings peak torque significantly declined from 185.1 ± 70.4 N·m pre-LIST to 150.9 ± 58.5 N·m post-LIST (P = .002), but there were no significant changes in hamstrings or quadriceps concentric peak torque (P = .312, .169, respectively).
  
  
  CONCLUSIONS
  Simulated soccer results in a selective loss of eccentric hamstrings torque and hamstrings-to-quadriceps muscle balance at an extended joint position and a shift in the eccentric hamstrings APT to a shorter length, changes that could increase vulnerability to hamstrings injury. These findings suggest that injury-risk screening could be improved by evaluating the eccentric hamstrings torque-angle profile and hamstrings strength-endurance and that the development of hamstrings fatigue resistance and long-length eccentric strength may reduce injury incidence.
authors.affiliation: Masira Institute, Faculty of Life Sciences, Universidad de Santander (UDES), Bucaramanga, Colombia.
authors.forename: Daniel D
authors.initials: DD
authors.lastname: Cohen
authors.forename: Bingnan
authors.initials: B
authors.lastname: Zhao
authors.forename: Brian
authors.initials: B
authors.lastname: Okwera
authors.forename: Martyn J
authors.initials: MJ
authors.lastname: Matthews
authors.forename: Anne
authors.initials: A
authors.lastname: Delextrat
mesh_terms: D000328:Adult; D005080:Exercise Test; D006801:Humans; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000293:injuries / Q000502:physiology*; D012307:Risk Factors; D012916:Soccer / Q000293:injuries / Q000502:physiology*; D013848:Thigh; D019415:Torque