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KMID : 0371919880010010111
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Journal of Wonju College of Medicine
1988 Volume.1 No. 1 p.111 ~ p.120
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A Morphometric Study on Skeletal Muscles of Active and Hibernating Bats(Rhinolophus ferrumequinum korai)
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Abstract
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The changes ocuurring during hibernation in the distribution and cross-sectional area of each muscle fiber type in various skeletal muscles were investigated in active and hibernating greater horseshoe bats (Rhinolophus ferrumequinum korai Kuroda).
The results were summarized as follows:
1. Most fibers of the pectoralis major ware composed of C fibers. In contrast, relatively high populations of A and B fibers were found in the biceps brachii, triceps brachii and gracilis.
2. During hibernation, the percentage of A fibers increased and the percentage of C fibers decreased in the biceps brachii and triceps brachii, but contrary results were observed in the pectoralis major and gracilis. The percentage of B fibers slightly decreased in the gracilis and did not change in the biceps brachii and triceps brachii.
3. During hibernation, in all muscles except the gracilis, crossectional area of A fibers significantly increased but those of C fibers decreased. In gracilis, an increase in cross-sectional areas of C fibers was observed but A and B fibers did not change in the cross-sectional area.
These results suggest that A and C fibers may be responsible for the adaptation of skeletal muscles to hibernation through the interconversion between A and C fibers in response to usage intensities.
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