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The never-ending search for the perfect acute:chronic workload ratio: what role injury definition?
  1. Billy T Hulin
  1. Correspondence to Billy T Hulin, School of Human Movement and Nutrition Sciences, University of Queensland, Brisbane, Australia; St. George Illawarra Dragons Rugby League Football Club, Wollongong, Australia; billyhulin{at}

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The debate on the acute:chronic workload ratio

The acute:chronic workload ratio is associated with injury risk in rugby league players.1 Researchers and practitioners have discussed the most appropriate way in which acute and chronic workloads should be modelled and compared with injury. Menaspà2 suggested that when workloads do not follow weekly patterns in team sport, rolling weekly averages may disregard variations in workload within the week and as such, are not ideal. However, Drew et al 3 highlighted that evidence was required before an alternative method could be considered. Williams et al,4 suggested an exponentially weighted moving average calculation of acute and chronic workloads. To my knowledge, all this discussion has ignored definition of injury—this could influence the findings of any workload-injury analysis.

We should not overlook injury definition

Relating the findings from multiple injury investigations in team sport can be difficult due to the use of inconsistent definitions of injury.5 Both Hulin …

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  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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