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Muscle fatigue induced by exercise simulating the work rate of competitive soccer

Rahnama, N, Reilly, T, Lees, A and Graham-Smith, P 2003, 'Muscle fatigue induced by exercise simulating the work rate of competitive soccer' , Journal of Sports Sciences, 21 (11) , pp. 933-942.

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    Fatigue represents a reduction in the capability of muscle to generate force. The aim of the present study was to establish the effects of exercise that simulates the work rate of competitive soccer players on the strength of the knee extensors and knee flexors. Thirteen amateur soccer players (age 23.3±3.9 years, height 1.78±0.05 m, body mass 74.8±3.6 kg; mean±s) were tested during the 2000-2001 soccer season. Muscle strength of the quadriceps and hamstrings was measured on an isokinetic dynamometer. A 90 min soccer-specific intermittent exercise protocol, incorporating a 15 min half-time intermission, was developed to provide fatiguing exercise corresponding in work rate to a game of soccer. The exercise protocol, performed on a programmable motorized treadmill, consisted of the different intensities observed during soccer match-play (e.g. walking, jogging, running, sprinting). Muscle strength was assessed before exercise, at half-time and immediately after exercise. A repeated-measures analysis of variance showed significant reductions (P <0.001) in peak torque for both the quadriceps and hamstrings at all angular velocities (concentric: 1.05, 2.09, 5.23 rad · s-1; eccentric: 2.09 rad · s-1). The peak torque of the knee extensors (KE) and knee flexors (KF) was greater before exercise [KE: 232±37, 182±34, 129±27, 219±41 N · m at 1.05, 2.09 and 5.23 rad · s-1 (concentric) and 2.09 rad · s-1 (eccentric), respectively; KF: 126±20, 112±19, 101±16, 137±23 N · m] than at half-time (KE: 209±45, 177±35, 125±36, 214±43 N · m; KF: 114±31, 102±20, 92±15, 125±25 N · m) and greater at half-time than after exercise (KE: 196±43, 167±35, 118±24, 204±43 N · m; KF: 104±25, 95±21, 87±13, 114±27 N · m). For the hamstrings : quadriceps ratio, significant changes were found (P <0.05) for both legs, the ratio being greater before than after exercise. For fast : slow speed and left : right ratios, no significant changes were found. We conclude that there is a progressive reduction in muscle strength that applies across a range of functional characteristics during exercise that mimics the work rate in soccer.

    Item Type: Article
    Uncontrolled Keywords: Eccentric action, peak torque, performance, work rate
    Themes: Subjects / Themes > R Medicine > R Medicine (General)
    Subjects / Themes > R Medicine > RC Internal medicine > RC1200 Sports Medicine
    Subjects / Themes > G Geography. Anthropology. Recreation > GV Recreation Leisure > GV0557 Sports
    Health and Wellbeing
    Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Health & Social Care > School of Health Sciences > Centre for Health Sciences Research
    Colleges and Schools > College of Science & Technology
    Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences
    Journal or Publication Title: Journal of Sports Sciences
    Publisher: Routledge Taylor & Francis
    Refereed: Yes
    ISSN: 02640414
    Depositing User: H Kenna
    Date Deposited: 09 Aug 2007 12:56
    Last Modified: 20 Aug 2013 16:46

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