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Am J Physiol Endocrinol Metab 271: E38-E43, 1996;
0193-1849/96 $5.00
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AJP - Endocrinology and Metabolism, Vol 271, Issue 1 E38-E43, Copyright © 1996 by American Physiological Society

ARTICLES

Metabolic response of type I and II muscle fibers during repeated bouts of maximal exercise in humans

A. Casey, D. Constantin-Teodosiu, S. Howell, E. Hultman and P. L. Greenhaff
Department of Physiology and Pharmacology, University of Nottingham Medical School, Queen's Medical Center, United Kingdom.

Nine male subjects performed two bouts of 30-s maximal isokinetic cycling. Each bout of exercise was performed at 80 revolutions/min and was separated by 4 min of recovery. Mixed-muscle phosphocreatine (PCr) resynthesis during recovery (88.1 +/- 6.1%) was positively correlated with the restoration of total work production during bout 2 (r = 0.80, P < 0.05). During bout 1, ATP and PCr utilization were greater in type II compared with type I fibers (P < 0.01 and P < 0.05, respectively). The subsequent 4-min period of recovery was insufficient to allow total restoration of ATP and PCr in type II fibers, but restoration of ATP and PCr in type I fibers was almost complete. During the second bout of exercise, ATP and PCr utilization were reduced in type II fibers (P < 0.01), without a corresponding change in type I fibers, and performance was also significantly reduced. The reduction in work capacity observed during bout 2 may have been related to a slower resynthesis, and consequently a reduced availability, of ATP and PCr in type II fibers.


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