title: Injury rates in rugby league football: impact of change in playing season.
abstract: BACKGROUND
  In 1996, the professional rugby league moved its playing season from the autumn and winter months to the spring and summer.
  
  
  OBJECTIVE
  To determine whether the change in playing season altered the risk of player injury.
  
  
  METHODS
  Prospectively collected data comparing two cohorts.
  
  
  METHODS
  Injuries incurred by all players in one club during match play were recorded over 9 seasons: 4 winter (138 games) and 5 summer (144 games). Each injury was classified according to site, type, player position, activity at the time of injury, and number of games missed as a result of injury.
  
  
  RESULTS
  The total exposure time during this study was 4876 player-hours (winter, 2386, summer, 2490). The relative risk of injury doubled after the move from winter to summer. Winter rugby accounted for 72 injuries, and summer rugby, for 150 injuries.
  
  
  CONCLUSIONS
  Risk of injury to players in a professional rugby league club greatly increased as a result of changing the playing calendar, possibly as a result of environmental factors. However, other factors, such as increased conditioning levels, which have been a direct consequence of players moving to full-time professionalism, may have increased injury potential.
authors: Department of Health and Social Care, Brunel University, Isleworth, United Kingdom.
authors: Conor
authors: C
authors: Gissane
authors: De
authors: D
authors: Jennings
authors: Kathleen
authors: K
authors: Kerr
authors: John
authors: J
authors: White
mesh_terms: D000328:Adult; D001265:Athletic Injuries / Q000453:epidemiology* / Q000209:etiology; D004739:England / Q000453:epidemiology; D005538:Football / Q000293:injuries*; D006801:Humans; D015994:Incidence; D008297:Male; D011446:Prospective Studies; D012307:Risk Factors; D012621:Seasons