RT Journal Article
SR Electronic
T1 HOW MUCH RUGBY IS TOO MUCH? A SEVEN-SEASON PROSPECTIVE COHORT STUDY OF MATCH EXPOSURE IN PROFESSIONAL RUGBY UNION PLAYERS
JF British Journal of Sports Medicine
JO Br J Sports Med
FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine
SP 410
OP 410
DO 10.1136/bjsports-2016-097372.319
VO 51
IS 4
A1 Williams, Sean
A1 Trewartha, Grant
A1 Kemp, Simon
A1 Brooks, John
A1 Fuller, Colin
A1 Taylor, Aileen
A1 Cross, Matt
A1 Shaddick, Gavin
A1 Stokes, Keith
YR 2017
UL http://bjsm.bmj.com/content/51/4/410.1.abstract
AB Background Player welfare concerns have been raised by a number of professional Rugby Union stakeholders regarding the match exposure demands faced by players.Objective To investigate the influence that acute and chronic match exposures have upon injury risk.Design A seven-season (2006/7–2012/13) prospective cohort design was used to record time-loss injuries (>24 h) and match exposure.Setting English Premiership Professional Rugby Union.Participants 1253 professional players.Assessment of Risk Factors A player's 12-month match exposure (number of matches a player was involved in for ≥20 mins in the preceding 12 months) and month match exposure (number of full-game equivalent matches in preceding 30 days) were assessed as ‘chronic’ and ‘acute’ risk factors, respectively.Main Outcome Measurements A nested-frailty model was applied to calculate adjusted hazard ratios (HR) for the assessed risk factors. Thresholds for beneficial and harmful effects were 0.90 and 1.11, respectively.Results 12-month match exposure was associated with injury in a non-linear fashion, with players who had been involved in less than ≈15 or greater than ≈35 matches (for ≥20 mins) over the preceding 12-month period being more susceptible to injury. Monthly match exposure was linearly associated with injury (HR: 1.14 per 2-SD increase, 90% CI: 1.08–1.20; likely harmful), although this effect was substantially attenuated for players in the upper quartile for 12-month match exposure (>28 matches).Conclusions A player's accumulated and recent match exposure substantially influences their current injury risk. Careful attention should be paid to planning the workload and monitoring the responses of players involved in: 1) a high number of matches in the previous year; 2) a low number of matches in the previous year; 3) a low-moderate number of matches in the previous year but have played intensively in the recent past. These findings could inform match workload planning in professional Rugby Union.