Low chronic workload and the acute: chronic workload ratio are more predictive of injury than between-match recovery time: a two-season prospective cohort study in elite rugby league players

Hulin, Billy T., Gabbett, Tim J., Caputi, Peter, Lawson, Daniel W. and Sampson, John A. (2016) Low chronic workload and the acute: chronic workload ratio are more predictive of injury than between-match recovery time: a two-season prospective cohort study in elite rugby league players. British Journal of Sports Medicine, 50 16: 1008-1012. doi:10.1136/bjsports-2015-095364


Author Hulin, Billy T.
Gabbett, Tim J.
Caputi, Peter
Lawson, Daniel W.
Sampson, John A.
Title Low chronic workload and the acute: chronic workload ratio are more predictive of injury than between-match recovery time: a two-season prospective cohort study in elite rugby league players
Journal name British Journal of Sports Medicine   Check publisher's open access policy
ISSN 1473-0480
0306-3674
Publication date 2016-02-05
Year available 2016
Sub-type Article (original research)
DOI 10.1136/bjsports-2015-095364
Open Access Status Not Open Access
Volume 50
Issue 16
Start page 1008
End page 1012
Total pages 5
Place of publication London, United Kingdom
Publisher B M J Group
Collection year 2017
Language eng
Formatted abstract
Background: Between-match recovery time, and acute and chronic workloads likely affect subsequent matchinjury risk in elite rugby league players.

Methods: Workloads of 28 players throughout two seasons were calculated during short (<7 days), and long (=7 days) between-match recovery times. 'Acute' workloads (1 week) greater than 'chronic' workloads (4-week rolling average acute workload) resulted in acute:chronic workload ratios above 1.

Results: No difference was found between the matchinjury risk of short and long between-match recovery periods (7.5±2.5% vs 6.8±2.5%). When players had a short recovery between matches, high chronic workloads (18.9-22.0 km) were associated with a smaller risk of match injury than chronic workloads <18.9 km (relative risk (RR) range 0.27-0.32 (CI 0.08 to 0.92); likelihood range 90-95%, likely). Players who had shorter recovery and acute:chronic workload ratios =1.6, were 3.4-5.8 times likely to sustain a match injury than players with lower acute:chronic workload ratios (RR range 3.41-5.80 (CI 1.17 to 19.2); likelihood range 96-99%, very likely). Acute:chronic workload ratios between 1.2 and 1.6 during short between-match recovery times demonstrated a greater risk of match injury than ratios between 1.0 and 1.2 (RR=2.88 (CI 0.97 to 8.55); likelihood=92%, likely).

Conclusions: Contrary to the philosophy that high workloads and shorter recovery equate to increased injury risk, our data suggest that high and very-high chronic workloads may protect against match injury following shorter between-match recovery periods. Acute:chronic workload ratios ~1.5 are associated with a greater risk of match injury than lower acute:chonic workload ratios. Importantly, workloads can be manipulated to decrease the match-injury risk associated with shorter recovery time between matches.
Keyword Low chronic workload
Acute:chronic workload
Injury
Between-match recovery time
Match-injury risk
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Human Movement and Nutrition Sciences Publications
 
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