Abstract

The purpose of this study was to examine the relationship between children's performance on the Wingate Anaerobic Test (WAnT) and thigh muscle volume (TMV). Fifteen boys and 14 girls (age 9.9 ± 0.3 y) had their right TMV determined from Magnetic Resonance Imaging (MRI) scans. No significant difference (P >0.05) in TMV was detected between boys (2.39± 0.29 l) and girls (2.18 ± 0.38 l). No significant (P >0.05) sex difference in peak power (PP) was observed (341 ± 75.5 vs 291.9± 62.7 W), but boys' mass related PP was significantly (P <0.05) higher than girls' (10.7 ± 1.2 vs 8.2 ± 0.5 W.kg-1). Boys' mean power (MP) was significantly (P <0.05) greater than girls' in both absolute (247.0 ± 61.6 vs 202.9 ± 37.9 W) and mass-related terms (7.8 ± 2.1 vs 5.8 ± 0.9 W.kg-1). In boys, TMV was significantly correlated (P <0.05) with PP (r=0.89), MP (r=0.52) and mass-related PP (r=0.53). In girls TMV is significantly (P <0.05) related to PP (r=0.87) and MP (r=0.80). Allometric scaling of the PP and MP data produced common mass exponents of b = 1.12 (SE 0.10) and b = 0.51 (SE 0.21) respectively. PP expressed as W.kg-1.12 and MP as W.kg-0.51 remained significantly higher (P <0.05) in boys compared with girls (6.9± 0.79 vs 5.3 ± 0.31 W.kg-1.12 and 42.3 ± 10.7 vs 32.8 ± 4.7 W.kg-0.51). No significant (P >0.05) correlations between TMV and allometrically scaled PP or MP were detected. In conclusion, although children's TMV was correlated to both PP and MP, when body size is accounted for appropriately using allometric scaling the relationship becomes non-significant.

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