Comparative study on the regional composition of fiber types in the cranial portion of M. biceps femoris in Japanese black steers
1995
Goto, T. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Iwamoto, H. | Ono, Y. | Nishimura, S. | Shigematsu, I. | Nakanishi, Y. | Umetsu, R. | Takahara, H.
A variation in fiber type distribution between regions was clarified in the cranial portion of the M. biceps femoris of Japanese Black steers. The cranial portion was divided into three main parts (proximal, middle and distal) and 15 subparts (5 arranged with respect to the superficial-profound subpart in each part). Muscle fibers were classified into type beta-R, alpha-R and Alpha-W fibers according to the nomenclature of Ashmore et al. Among the proximal, middle and distal parts, the percentage of Type beta-R fibers was higher in the proximal than in the middle and distal parts, while Type alpha-R fibers showed a converse tendency. The percentage of Type alpha-W fibers was highest in the distal part and lowest in the proximal part. Among proximal subparts, the fiber type percentages did not show and difference. Among the middle subparts, however, the percentage of Type beta-R and alpha-W fibers was higher in the superficial than in the profound subparts, while that of Type alpha-R fibers exhibited a converse tendency. Among the distal subparts, the percentage of Type alpha-W fiber was higher in the superficial than in the profound subpart and that of Type alpha-R fibers was lower in the superficial than in the profound subparts
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