A cherry, ripe for picking: The relationship between the acute-chronic workload ratio and health problems
Dalen-Lorentsen, Torstein; Andersen, Thor Einar; Bjørneboe, John Andreas; Vagle, Markus; Martin, Kevin Nordanger; Kleppen, Michael; Fagerland, Morten; Clarsen, Benjamin Matthew
Peer reviewed, Journal article
Accepted version
Permanent lenke
https://hdl.handle.net/11250/3123027Utgivelsesdato
2021Metadata
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Originalversjon
Journal of Orthopaedic and Sports Physical Therapy. 2021, 51(4), 162-173. 10.2519/jospt.2021.9893Sammendrag
Objective: To investigate whether the relationship between the acute-chronic workload ratio (ACWR) and health problems varies when different methodological approaches are used to quantify it. Design: Prospective cohort study. Methods: An online questionnaire was used to collect daily health and training information from 86 elite youth footballers for 105 days. The relationship between players' training load and health was analyzed using a range of different definitions of ACWR and health problems. We used 21-day and 28-day chronic periods, coupled and uncoupled calculations, and the exponentially weighted moving average and rolling average. Acute-chronic workload ratio data were categorized as low, medium, or high, using predefined categories and z scores. We compared medium to high, medium to low, and low to high categories. The outcome was defined in 3 ways: “all health problems,” “all injuries,” and “new noncontact injuries.” We performed random-effects logistic regression analyses of all combinations, for a total of 108 analyses. Results: We recorded 6250 athlete-days and 196 health problems. Of the 108 analyses performed, 23 (21%) identified a statistically significant (P<.05) association between the ACWR and health problems. A greater proportion of significant associations were identified when using an exponentially weighted moving average (44% of analyses), when comparing low to high categories (33%), and when using the “all health problems” definition (33%). Conclusion: The relationship between the ACWR and health problems was dependent on methodological approach.
Beskrivelse
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