Abstract of article "Spatial fiber type distribution in normal human muscle histochemical and tensiomyographical evaluation"

DAHMANE, Raja, DJORDJEVIĆ, Srdjan, ŠIMUNIČ, Boštjan, VALENČIČ, Vojko. Spatial fiber type distribution in normal human muscle histochemical and tensiomyographical evaluation. J. biomech.. (Print ed.), 2005, št. 12, letn. 38, str. 2451-2459. (COBISS.SI-ID 2249323)

Abstract

Study was made to determine the extent to which the relative occurrence of different fiber types and subtypes varies within human limb muscles in order to depth and to predict fiber type proportions with a non-invasive TMG method. Examination of the variability of fiber type distribution in nine limb muscles was made with histochemical and tensiomyographical (TMG) methods in two groups of 15 men aged between 17 and 40 years. The distribution of different fiber types varied within the muscles, as a function of depth, with a predominance of type 2b fibers at the surface and type 1 fibers in deeper regions of the muscle. Contraction times for all the analyzed muscles which were measured at stimulus intensity 10% of supramaximal stimulus (10% MS) were significantly (po0:05) shorter than the contraction times measured at 50% of supramaximal stimulus intensity (50% MS). The Pearson’s correlation coefficient between percentage of type 1 muscle fibers measured at the surface of the muscle and contraction time at 10% MS, obtained by TMG was statistically significant (r Ľ 0:76; Po0:01). Furthermore also the Pearson’s correlation coefficient between percentage of type 1 muscle fibers measured in the deep region of the muscle and contraction time at 50% MS obtained by TMG was also statistically significant (r Ľ 0:90; Po0:001). Findings of the study suggest that the contraction time obtained by TMG may be useful for non-invasive examining of muscle fiber types spatial distribution in humans.