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Effect of endurance training on muscle fiber type composition and capillary supply in rat diaphragm

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Summary

Muscle fiber type composition and capillary supply in rat diaphragm were investigated after 14 weeks of endurance training: body weight and muscle fiber area were significantly decreased, the muscle fiber type composition, capillary to fiber ratio and number of capillaries around each fiber type were unchanged, and the capillary density and number of capillaries around each fiber relative to fiber type areas were significantly increased. These small fiber areas and increased capillary supplies in the trained rats would facilitate oxygen transport to all parts of the muscle fiber during exercise. It is concluded that the changes observed in the trained rat diaphragm appear to enhance the capacity for oxidative metabolism.

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Authors and Affiliations

  1. Institute of Sports Medicine, Yokohama City University, Seto 22-2 Kanazawa-ku, Yokohama 236, Japan

    Nobukazu Tamaki

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  1. Nobukazu Tamaki
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Tamaki, N. Effect of endurance training on muscle fiber type composition and capillary supply in rat diaphragm. Europ. J. Appl. Physiol. 56, 127–131 (1987). https://doi.org/10.1007/BF00640634

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  • DOI: https://doi.org/10.1007/BF00640634

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