Cell size and oxidative enzyme activity of rat biceps brachii and triceps brachii muscles.

Cell size and oxidative enzyme activity of rat biceps brachii and triceps brachii muscles. Research Abstract Details 

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Cell size and oxidative enzyme activity of rat biceps brachii and triceps brachii muscles. Abstract Text:

Akiko Matsumoto,Fumiko Nagatomo,Ayako Mori,Yoshinobu Ohira,Akihiko Ishihara,

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.

Cell size and oxidative enzyme activity of rat biceps brachii and triceps brachii muscles. Publishing Authors By Initials

A Matsumoto,F Nagatomo,A Mori,Y Ohira,A Ishihara,

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Cell size and oxidative enzyme activity of rat biceps brachii and triceps brachii muscles. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The journal of physiological sciences : JPS

VOLUME: 57

Page Numbers: 311-6

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ISSN: 1880-6546

DAY: 1

MONTH: 11

YEAR: 2007

Cell size and oxidative enzyme activity of rat biceps brachii and triceps brachii muscles. Information

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LANGUAGE: eng

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AFFILIATION: Laboratory of Neurochemistry, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, 606-8501 Japan. ishihara@life.mbox.media.kyoto-u.ac.jp.

Country: Japan

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MEDLINETA: J Physiol Sci

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