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Effects of running exercise with increasing loads on tibialis anterior muscle fibres in mice

Published online by Cambridge University Press:  09 January 2002

Akihiko Ishihara ,
Chiyoko Hirofuji ,
Toshiaki Nakatani ,
Kazuo Itoh ,
Minoru Itoh  and
Shigeru Katsuta
Akihiko Ishihara
Affiliation:
Laboratory of Neurochemistry, Faculty of Integrated Human Studies, Kyoto University, Kyoto 606-8501, Japan, Department of Exercise Physiology, Osaka Gakuin Junior College, Suita 564-8511, Japan, Human Performance and Exercise Prescription Laboratory, Tenri University, Tenri 632-0071, Japan and Graduate School of Integrated Science and Art, University of East Asia, Shimonoseki 751-0807, Japan
Chiyoko Hirofuji
Affiliation:
Laboratory of Neurochemistry, Faculty of Integrated Human Studies, Kyoto University, Kyoto 606-8501, Japan, Department of Exercise Physiology, Osaka Gakuin Junior College, Suita 564-8511, Japan, Human Performance and Exercise Prescription Laboratory, Tenri University, Tenri 632-0071, Japan and Graduate School of Integrated Science and Art, University of East Asia, Shimonoseki 751-0807, Japan
Toshiaki Nakatani
Affiliation:
Laboratory of Neurochemistry, Faculty of Integrated Human Studies, Kyoto University, Kyoto 606-8501, Japan, Department of Exercise Physiology, Osaka Gakuin Junior College, Suita 564-8511, Japan, Human Performance and Exercise Prescription Laboratory, Tenri University, Tenri 632-0071, Japan and Graduate School of Integrated Science and Art, University of East Asia, Shimonoseki 751-0807, Japan
Kazuo Itoh
Affiliation:
Laboratory of Neurochemistry, Faculty of Integrated Human Studies, Kyoto University, Kyoto 606-8501, Japan, Department of Exercise Physiology, Osaka Gakuin Junior College, Suita 564-8511, Japan, Human Performance and Exercise Prescription Laboratory, Tenri University, Tenri 632-0071, Japan and Graduate School of Integrated Science and Art, University of East Asia, Shimonoseki 751-0807, Japan
Minoru Itoh
Affiliation:
Laboratory of Neurochemistry, Faculty of Integrated Human Studies, Kyoto University, Kyoto 606-8501, Japan, Department of Exercise Physiology, Osaka Gakuin Junior College, Suita 564-8511, Japan, Human Performance and Exercise Prescription Laboratory, Tenri University, Tenri 632-0071, Japan and Graduate School of Integrated Science and Art, University of East Asia, Shimonoseki 751-0807, Japan
Shigeru Katsuta
Affiliation:
Laboratory of Neurochemistry, Faculty of Integrated Human Studies, Kyoto University, Kyoto 606-8501, Japan, Department of Exercise Physiology, Osaka Gakuin Junior College, Suita 564-8511, Japan, Human Performance and Exercise Prescription Laboratory, Tenri University, Tenri 632-0071, Japan and Graduate School of Integrated Science and Art, University of East Asia, Shimonoseki 751-0807, Japan
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Abstract

Cross-sectional areas and succinate dehydrogenase (SDH) activities of type identified fibres in the deep, middle and superficial regions of the tibialis anterior muscle in mice were examined after 4 weeks of voluntary running exercise with increasing loads. Nineteen-week-old male mice were assigned randomly to either a control or exercise group. The mean cross-sectional areas of all types (IIa, IIx and IIb) of fibres in the superficial region of the muscle were greater in the exercise group than in the control group. The mean SDH activities of type IIx and type IIb fibres in the middle region and of all types (IIa, IIx and IIb) of fibres in the superficial region of the muscle were greater in the exercise group than in the control group. These results suggest that voluntary running exercise with increasing loads causes hypertrophy and/or an increase in the SDH activity of fibres in the specific muscle region where fibres with a high threshold and a low-oxidative enzyme activity are distributed, and these fibres are recruited to adapt to changes in exercise conditions. Experimental Physiology (2002) 87.2, 113-116.

Type
Rapid Communications
Information
Experimental Physiology , Volume 87 , Issue 2 , March 2002 , pp. 113 - 116
Copyright
© The Physiological Society 2002

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