Influence of an intensified competition on fatigue and match performance in junior rugby league players
Article
Article Title | Influence of an intensified competition on fatigue and match performance in junior rugby league players |
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ERA Journal ID | 9776 |
Article Category | Article |
Authors | Johnston, Rich D. (Author), Gabbett, Tim J. (Author) and Jenkins, David G. (Author) |
Journal Title | Journal of Science and Medicine in Sport |
Journal Citation | 16 (5), pp. 460-465 |
Number of Pages | 6 |
Year | 2013 |
Publisher | Elsevier |
Place of Publication | Australia |
ISSN | 1440-2440 |
1878-1861 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jsams.2012.10.009 |
Web Address (URL) | http://ac.els-cdn.com/S1440244012002113/1-s2.0-S1440244012002113-main.pdf?_tid=4f5d5fc0-3c45-11e7-8b3c-00000aab0f6b&acdnat=1495165584_10d261c27fc863a8388b7b39759d10f6 |
Abstract | Objectives: The aim of this study was to assess the physiological responses to an intensified rugby league competition and explore the relationships between fatigue and match performance. Design: Prospective cohort study. Methods: Fifteen junior rugby league players (n= 8 forwards, 7 backs; mean ± SE, age 16.6 ± 0.2 years; body mass 81.6 ± 3.0. kg; and height 178.9 ± 1.8. cm) competed in five 40. min games over 5 days (two games each on days 1 and 2, one game on day 4, and no games on days 3 and 5). Over the competition, players performed a countermovement jump to assess neuromuscular fatigue, provided a fingertip blood sample to measure blood creatine kinase, and completed a questionnaire to monitor perceived wellbeing; ratings of perceived effort were recorded following each game. Global positioning system and video analysis of each game were used to assess match performance. Results: Over the first 3 days, there were progressive and large increases in neuromuscular fatigue which peaked 12. h after game 4 (forwards ES = 4.45, p= 0.014; backs ES = 3.62, p= 0.029), and muscle damage which peaked 1. h post game 4 (forwards ES = 4.45, p= 0.004; backs ES = 3.94 p= 0.012), as well as reductions in perceived wellbeing. These measures gradually recovered over the final 2 days of the competition. Compared to the backs, the forwards experienced greater increases in creatine kinase following game 2 (ES = 1.30) and game 4 (ES = 1.24) and reductions in perceived wellbeing (ES = 0.25-0.46). Match intensity, high-speed running, and repeated-high intensity effort bouts decreased in games 4 and 5 of the competition. Small to large associations were observed between the changes in fatigue, muscle damage and match performance, with significant correlations between creatine kinase and repeated high-intensity effort bout number (r= -0.70, p= 0.031) and frequency (r= 0.74, p= 0.002) and low-speed activity (r= -0.56, p= 0.029). Conclusions: Fatigue and muscle damage accumulate over an intensified competition, which is likely to contribute to reductions in high-intensity activities and work rates during competition. |
Keywords | game intensity; GPS; muscle damage; neuromuscular fatigue; team sports; physiology; work and sport; physiology; muscle physiology; occupational health and industrial medicine; work environment; physical factors; occupational health and industrial medicine; work and health; musculoskeletal system and the back; occupational health and industrial medicine; life style; sport and leisure |
ANZSRC Field of Research 2020 | 420799. Sports science and exercise not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Australian Catholic University |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q43xq/influence-of-an-intensified-competition-on-fatigue-and-match-performance-in-junior-rugby-league-players
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