Pitcher, C. A, Elliott, C. M, Williams, S. A, Licari, M. K, Kuenzel, A., Shipman, P. J, Valentine, J. P & Reid, SL. (2012). Childhood muscle morphology and strength: Alterations over six months of growth. Muscle and Nerve,46(3), 360-366. United Kingdom: John Wiley & Sons, Inc.. Retrieved from https://doi.org/10.1002/mus.23326
Introduction: The purpose of this study was to establish the nature and stability of the strength-size relationship for the knee flexors and extensors across a 6-month period of childhood growth. Methods: Nineteen typically developing children aged 5–11 years underwent lower limb magnetic resonance imaging (MRI) and dynamometry strength assessments on 2 occasions, 6 months apart. Muscle volume (MV) and maximum anatomical cross-sectional area (aCSA) for the knee flexors and extensors were determined using MRI analysis software. Isokinetic dynamometry determined corresponding isometric and isokinetic strength. Results: Strong correlations were found between muscle size and strength for both the knee flexors and extensors (r = 0.84–0.90; P < 0.01). Furthermore, the ratio of strength to muscle size remained consistent across 6 months of prepubescent growth. Conclusions: Increases in thigh muscle strength were relative to those in muscle size, suggesting that muscle growth may play an important role in the development of strength during childhood.
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