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Acidity helps prevent muscle fatigue

Aug. 19, 2004 at 5:02 PM   |   Comments

MELBOURNE, Aug. 19 (UPI) -- Australian scientists have found that acidity in the muscles helps prevent fatigue, something that contradicts previous notions that acid build-up is a cause.

Scientists at La Trobe University and other institutions found the muscles use acidosis, or the build-up of acid, to avoid fatigue and make sure they keep responding properly and efficiently to nerve signals.

The research appears in the August 20 issue of the journal Science.

Muscle contraction occurs when a network of tiny tubes in muscle fiber -- known as the T-system -- receives electrical signals from nerves to excite movement throughout the muscle.

Chloride ions depress muscle fibers by reducing the excitability of the surface membrane and T-system in this process, but researchers suspect that acidity counters these depressive effects and lowers fatigue.

"It is a very clever trick because rested muscles need the chloride effect normally to prevent them spontaneously contracting," said George Stephenson at La Trobe's Muscle Research Laboratory. "The acidity produced by the strenuous exercise reduces chloride's stabilizing effect."

© 2004 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
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