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    Tensiomyographic assessment of muscle contractile properties in 9- to 14-year old children

    Simunic, Bostjan, Degens, Hans, Zavrsnik, Jernej, Koren, Katja, Vomut, Tadeja and Pisot, Rado (2017) Tensiomyographic assessment of muscle contractile properties in 9- to 14-year old children. International Journal of Sports Medicine, 38 (9). pp. 659-665. ISSN 0172-4622

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    While there are numerous data on the skeletal muscle fibre type composition in adults, little is known about the changes in fibre type composition and contractile properties during maturational growth in children. Using noninvasive tensiomyography we measured contraction time, an indirect estimate of the myosin heavy chain I (MHC-I) proportion, to assess the longitudinal changes of the biceps brachii (BB), biceps femoris (BF), vastus lateralis (VL), and erector spinae (ES) muscles in 53 boys and 54 girls. The children were 9 years at the start of the study and returned for 5 follow-up measurements till the age of 14 years. The ES has the shortest and the BF has the longest Tc. The VL and ES of boys have shorter Tc than those from girls. When applying the relationship between proportion of MHC-I and Tc established in adults to the children TMG data, we found a slow-to-fast transition in the VL between at least the age of 6 and 10 years, when it had stabilized to adult proportions. Regular participation in sport was associated with a faster BF, but not in VL. Our data represents a first non-invasive indication of the developmental changes in muscle fiber type composition in children.

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