Cell Size and Oxidative Enzyme Activity of Rat Biceps Brachii and Triceps Brachii Muscles

The Journal of Physiological Sciences

Ayako Mori²  Akihiko Ishihara²  Fumiko Nagatomo²  Yoshinobu Ohira¹  Akiko Matsumoto² 

[1] Section of Applied Physiology, Graduate School of Medicine, Osaka University;Laboratory of Neurochemistry, Graduate School of Human and Environmental Studies, Kyoto University

关键词: biceps brachii muscle;    cell size;    oxidative enzyme activity;    rat;    triceps brachii muscle;   

DOI  :  10.2170/physiolsci.RP008907

学科分类：生理学

来源: Springer

【 摘 要 】

References(34)Cited-By(2)Fiber-type distributions, cross-sectional areas, and oxidative enzyme activities of type-identified fibers in the biceps brachii and triceps brachii muscles of 10-week-old male Wistar rats were determined and compared with those in the soleus and plantaris muscles. The soleus and plantaris muscles consisted of two (I and IIA) and three (I, IIA, and IIB) types of fibers, respectively. The deep regions of the biceps brachii and triceps brachii muscles consisted of three types of fibers, while the surface regions of those muscles consisted only of type IIB fibers. The cross-sectional areas of fibers in the deep and surface regions of the plantaris muscle and in the deep regions of the biceps brachii and triceps brachii muscles were in the rank order of type I = type IIA < type IIB, while the oxidative enzyme activities of fibers in the deep and surface regions of the plantaris muscle and in the deep region of the triceps brachii muscle were in the rank order of type IIB < type I = type IIA. These results indicate that fiber-type distributions, cross-sectional areas, and oxidative enzyme activities are muscle type- and region-specific. Therefore, the metabolic and functional significance of the biceps brachii and triceps brachii muscles, especially in the surface regions, where only type IIB fibers are located, in those muscles, appears to be determined by their fibers having larger cells and lower oxidative enzyme activity.

【 授权许可】

Unknown