Accumulated workloads and the acute: chronic workload ratio relate to injury risk in elite youth football players

作者：Bowen, Laura; Gross, Aleksander Stefan; Gimpel, Mo; Li, Francois-Xavier^*

来源：British Journal of Sports Medicine, 2017, 51(5): 452-459.

DOI：10.1136/bjsports-2015-095820

• AUSTRALIAN FOOTBALLERS
• RUNNING LOADS
• SOCCER
• LEAGUE
• GPS
• PREVENTION
• MOTION

Aim The purpose of this study was to investigate the relationship between physical workload and injury risk in elite youth football players. @@@ Methods The workload data and injury incidence of 32 players were monitored throughout 2 seasons. Multiple regression was used to compare cumulative (1, 2, 3 and 4-weekly) loads and acute: chronic (A:C) workload ratios (acute workload divided by chronic workload) between injured and non-injured players for specific GPS and accelerometer-derived variables: total distance (TD), high-speed distance (HSD), accelerations (ACC) and total load. Workloads were classified into discrete ranges by z-scores and the relative risk was determined. @@@ Results A very high number of ACC (>= 9254) over 3 weeks was associated with the highest significant overall (relative risk (RR) = 3.84) and non-contact injury risk (RR = 5.11). Non-contact injury risk was significantly increased when a high acute HSD was combined with low chronic HSD (RR = 2.55), but not with high chronic HSD (RR = 0.47). Contact injury risk was greatest when A: C TD and ACC ratios were very high (1.76 and 1.77, respectively) (RR = 4.98). @@@ Conclusions In general, higher accumulated and acute workloads were associated with a greater injury risk. However, progressive increases in chronic workload may develop the players' physical tolerance to higher acute loads and resilience to injury risk.

• 出版日期2017-3