Identifying risk factors for contact injury in professional rugby league players – application of a frailty model for recurrent injury

Gabbett, Tim J., Ullah, Shahid and Finch, Caroline F. (2012) Identifying risk factors for contact injury in professional rugby league players – application of a frailty model for recurrent injury. Journal of Science and Medicine in Sport, 15 6: 496-504. doi:10.1016/j.jsams.2012.03.017


Author Gabbett, Tim J.
Ullah, Shahid
Finch, Caroline F.
Title Identifying risk factors for contact injury in professional rugby league players – application of a frailty model for recurrent injury
Journal name Journal of Science and Medicine in Sport   Check publisher's open access policy
ISSN 1440-2440
1878-1861
Publication date 2012-11-01
Sub-type Article (original research)
DOI 10.1016/j.jsams.2012.03.017
Open Access Status
Volume 15
Issue 6
Start page 496
End page 504
Total pages 9
Place of publication Chatswood, NSW, Australia
Publisher Elsevier
Language eng
Formatted abstract
Objectives: Well-developed physical qualities may protect against contact injuries. However, the potential contribution of physical qualities as risk or protective factors to contact injury risk is yet to be determined for rugby league. This study applied a frailty survival model that accounts for recurrent injury to identify risk factors for all physiotherapist-reported contact injury in professional rugby league players.
Design: Prospective cohort study.
Methods: Sixty-six professional rugby league players participated in this three successive year prospective study. At the start of each season, all players underwent measurements of standard anthropometry (height, body mass, and sum of seven skinfolds), speed (10 m and 40 m sprint), muscular strength (1 repetition maximum [RM] bench press, 1RM squat, 1RM weighted chin-ups), power (vertical jump, bench throw, 1RM power clean, jump squat), and endurance (maximum repetition bench press with 60 kg resistance), repeated-sprint ability (12 × 20 m sprints performed on a 20 s cycle), prolonged high-intensity intermittent running ability (8 × 12 s maximal effort shuttles performed on a 48 s cycle), and maximal aerobic power (multi-stage fitness test). Data was used to demonstrate the application of the frailty model extension of the Cox proportional regression model for recurrent events to identify factors associated with a high hazard ratio (HR) of injury.
Results: Heavier (body mass, HR = 2.6, 95% CI = 1.2–5.7), and faster (40 m sprint, HR = 2.1, 95% CI = 1.0–4.2) players, and those with poorly developed prolonged high-intensity intermittent running ability (HR = 2.9, 95% CI = 1.7–5.0) and upper-body strength (chin-up, HR = 2.2, 95% CI = 1.3–3.7) had a higher incidence of contact injuries.
Conclusions: This study demonstrates application of a novel statistical approach for the analysis of injury data that is recurrent in nature. This approach identified that the greater impact forces generated from heavier players with faster speed may result in an increase in recurrent contact injury rates. However, the development of prolonged high-intensity intermittent running ability and upper-body strength and power may assist to reduce the risk of contact injury in professional rugby league players.
Keyword Collision sport
Injury prevention
Physical attributes
Frailty model
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Human Movement and Nutrition Sciences Publications
 
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Created: Wed, 21 Nov 2012, 00:20:12 EST by Deborah Noon on behalf of School of Human Movement and Nutrition Sciences