H. Forbes1, A. Bullers1, A. Lovell1, L. R. McNaughton1, R. C. Polman2, J. C. Siegler1
1Department of Sport, Health and Exercise Science, University of Hull, Hull, United Kingdom
2Centre for Applied Sport and Exercise Sciences, University of Central Lancashire, Preston, United Kingdom

Forbes, H., Bullers, A., Lovell, A., McNaughton, L. R.,Polman,
           R. C. & Siegler, J. C. (2009). Relative torque profiles of
           elite male youth footballers: Effects of age and pubertal
           development (Relative Drehmomentsprofile junger
           Nachwuchsprofis im Fußball: Effekte von Alter und puberaler
           Entwicklung). Int. J. Sports Med., 30 (8), 592-597. Zugriff am
           11.08.2009 unter
           http://www.thieme-connect.de/ejournals/abstract/sportsmed/doi/10.1055/s-0029-1202817

       This study aimed to establish the effect of age and pubertal
       development on relative peak torque in youth footballers. One
       hundred and fifty-seven subjects were arranged into U12-U18 age
       groups; of these 133 also completed a self-reporting measure of
       pubertal development (PDS) and were grouped accordingly. Bilateral
       isokinetic testing included mean peak torque/body weight (PT/BW)
       and angle of peak torque (AoPT) for reps 2-4 of 5 in concentric
       quadriceps (CQ), concentric hamstrings (CH) and eccentric
       hamstrings (EH) at 60°s-1. Two minutes rest were provided between
       concentric and eccentric tests for both legs. A significant
       increase with age was noted for PT/BW in CQ, CH and EH (P<0.05),
       although post hoc analyses revealed different patterns of
       significance dependent upon muscle and type of contraction.
       Specifically, the U18 s (CQ:2.20 nm/kg, CH:1.39 nm/kg, EH:2.16
       nm/kg) were not significantly stronger than the U16 s and U15 s
       (CQ:2.42/2.29 nm/kg, CH:1.41/1.27 nm/kg, EH:2.22/2.15 nm/kg) even
       though they had entered full time training. The relationship
       between EH PT/BW and AoPT showed a weak but significant inverse
       correlation (P<0.001; R=-0.390 and -0.346 for dominant and non
       dominant legs). The findings of this study present unique football
       specific normative and age/PDS group data for PT/BW and AoPT, and
       the corresponding relationship between these variables.
       (Mikrofiche-Nummer: 17318)

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