@article{ref1,
title="Accumulated workloads and the acute:chronic workload ratio relate to injury risk in elite youth football players",
journal="British journal of sports medicine",
year="2016",
author="Bowen, Laura and Gross, Aleksander Stefan and Gimpel, Mo and Li, François-Xavier",
volume="51",
number="5",
pages="452-459",
abstract="AIM: The purpose of this study was to investigate the relationship between physical workload and injury risk in elite youth football (soccer) players. <br><br>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. <br><br>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). <br><br>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.<br><br>Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/<p /> <p>Language: en</p>",
language="en",
issn="0306-3674",
doi="10.1136/bjsports-2015-095820",
url="http://dx.doi.org/10.1136/bjsports-2015-095820"
}