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J Appl Physiol 61: 482-485, 1986;
8750-7587/86 $5.00
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Journal of Applied Physiology, Vol 61, Issue 2 482-485, Copyright © 1986 by American Physiological Society

ARTICLES

Mitochondrial creatine kinase activity alterations in skeletal muscle during long-distance running

F. S. Apple and M. A. Rogers

In human gastrocnemius muscle obtained from long-distance runners, mitochondrial creatine kinase (CK) activities were significantly greater than nonrunning control skeletal muscle and significantly increased during training for and after a marathon race. Thus skeletal muscle tended to become similar to heart muscle in its mitochondrial CK composition. Total muscle CK activity was significantly different in males and females, was unaffected by marathon training and racing, and was similar to gastrocnemius muscle obtained from nonrunning controls. There was an inverse correlation between the maximum O2 uptake and the percentage increase in mitochondrial CK activity after training. These studies suggest that mitochondrial CK may play a key role in the intracellular transport of energy from mitochondrial to myofibrils in skeletal muscle during endurance exercise such as long-distance running.


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