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Bowling loads and injury risk in male first class county cricket: Is ‘differential load’ an alternative to the acute-to-chronic workload ratio?

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Author
Tysoe, Alexander
Moore, Isabel
Ranson, Craig
McCaig, Steve
Williams, Sean
Date
2020-01-09
Acceptance date
2020-01-05
Type
Article
Publisher
Elsevier
ISSN
1878-1861
Metadata
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Abstract
Objectives: Methodological concerns relating to acute-to-chronic workload ratios (ACWR) have been raised. This study aimed to assess the relationship between an alternative predictor variable named ‘differential load’, representing the smoothed week-to-week rate change in load, and injury risk in first class county cricket (FCCC) fast bowlers. Design: Prospective cohort study. Methods: Bowling loads and injuries were recorded for 49 professional male fast bowlers from six FCCC teams. A range of differential loads and ACWRs were calculated and subjected to a variable selection procedure. Results: Exponentially-weighted 7-day differential load, 9:21-day ACWR, 42-day chronic load, and 9-day acute load were the best-fitting predictor variables in their respective categories. From these, a generalized linear mixed-effects model combining 7-day differential load, 42-day chronic load, and 9-day acute load provided the best model fit. A two-standard deviation (2SD) increase in 7-day differential load (22 overs) was associated with a substantial increase in injury risk (risk ratio [RR] = 2.47, 90% CI: 1.27-4.80, most likely harmful), and a 2SD increase in 42-day chronic load (17.5 overs/week) was associated with a most likely harmful increase in injury risk (RR = 6.77, 90% CI: 2.15-21.33). For 9-day acute load, very low values (≤1 over/week) were associated with a most likely higher risk of injury versus moderate (17.5 overs/week; RR: 15.50, 90% CI: 6.19-38.79) and very high 9-day acute loads (45.5 overs/week; RR: 133.33, 90% CI: 25.26-703.81). Conclusions: Differential loads may be used to identify potentially harmful spikes in load, whilst mitigating methodological issues associated with ACWRs.
Journal/conference proceeding
Journal of Science and Medicine in Sport;
Citation
Tysoe, A., Moore, I.S., Ranson, C., McCaig, S. and Williams, S. (2020) 'Bowling loads and injury risk in male first class county cricket: Is ‘differential load’an alternative to the acute-to-chronic workload ratio?', Journal of Science and Medicine in Sport. DOI: 10.1016/j.jsams.2020.01.004.
URI
http://hdl.handle.net/10369/10899
DOI
https://doi.org/10.1016/j.jsams.2020.01.004
Description
Article published in Journal of Science and Medicine on 09 January 2020 (online), available at: Sporthttps://doi.org/10.1016/j.jsams.2020.01.004.
Rights
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsorship
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
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  • Sport Research Groups [1088]

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