Association between the acute to chronic workload ratio and injury occurrence in young male team soccer players: a preliminary study

Arazi, Hamid, Asadi, Abbas, Khalkhali, Farhood, Boullosa, Daniel, Hackney, Anthony C., Granacher, Urs, and Zouhal, Hassane (2020) Association between the acute to chronic workload ratio and injury occurrence in young male team soccer players: a preliminary study. Frontiers in Physiology, 11. 608.

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Abstract

This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWR(RA)); and (2) exponentially weighted moving averages (ACWR(EWMA))] and the injury rate in young male team soccer players aged 17.1 +/- 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5,p= 0.01). There were also significant positive correlations between sRPE and training time (r= 0.411,p= 0.039), ACWR(RA)(r= 0.47,p= 0.049), and ACWR(EWMA)(r= 0.51,p= 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWR(RA),r= 0.31,p= 0.05; ACWR(EWMA),r= 0.53,p= 0.03). Explained variance (r(2)) for non-contact injury was significantly greater using the ACWR(EWMA)model (ranging between 21 and 52%) compared with ACWR(RA)(ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWR(EWMA)model is more sensitive than ACWR(RA)to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.

Item ID: 64007
Item Type: Article (Research - C1)
ISSN: 1664-042X
Keywords: training load, rate of perceived exertion, rolling averages, weighted moving averages, football
Copyright Information: © 2020 Arazi, Asadi, Khalkhali, Boullosa, Hackney, Granacher and Zouhal. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Date Deposited: 05 Aug 2020 07:49
FoR Codes: 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420702 Exercise physiology @ 100%
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