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J Appl Physiol (May 10, 2002). doi:10.1152/japplphysiol.00732.1999
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Articles in PresS, published online ahead of print May 10, 2002
J Appl Physiol, 10.1152/jap.00732.1999
Submitted on September 24, 1999
Accepted on May 3, 2002

Smaller muscle ATP reduction in women than in men by repeated bouts of sprint exercise

Mona Esbjornsson-Liljedahl1*, Kristina Bodin1, and Eva Jansson1

1 Department of Medical Laboratory Sciences & Technology, Division of Clinical Physiology, Huddinge Hospital, Karolinska Institutet, Huddinge, Sweden

* To whom correspondence should be addressed. E-mail: mona.esbjornsson.liljedahl{at}labtek.ki.se.

It was hypothesized that the reduction of high-energy phosphates in muscle following repeated sprints is smaller in women than men. Fifteen healthy and physically active women and men with an average age of 25 (range 19-42) years performed three 30-s cycle sprints (Wingate-test) with 20 min rest between sprints. Repeated blood and muscle samples were obtained. Freeze-dried pooled muscle fibers of type I and II were analyzed for high-energy phosphates and their breakdown products and for glycogen. Accumulation of plasma ATP breakdown products, plasma catecholamines and blood lactate, as well as glycogen reduction in type I fibers, was all lower in women than in men during sprint exercise. Repeated sprints induced smaller reduction of ATP and smaller accumulation of IMP and inosine in women than in men in type II muscle fibers, with no gender differences in changes of ATP and its breakdown products during the bouts of exercise themselves. This indicates that the smaller ATP reduction in women than in men during repeated sprints was created during recovery periods between the sprint exercises, and that women possess a faster recovery of ATP via reamination of IMP during these recovery periods.




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