| Effects of Dietary Sodium on Muscle Water and Electrolytes during Heat Acclimatization. | |
Abstract/OtherAbstract
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In an effort to assess the influence of daily sodium intake on muscle water and electrolytes during eight, successive days of exercise and heat exposure (90min/day; 40.1 C; 23.5% R.H.; 44-50% Vo2 max), nine men were studied under two dietary sodium (Na+) regimens (399 and 98 mEq Na+/day). Both the 399 mEq Na+ (HI) and 98 mEq Na+ (LO) diets contained 80 mEq potassium (K+) per day. The LO treatment resulted in higher heart rates, higher rectal temperatures, and a smaller plasma volume expansion than during the HI regimen. Though plasma K+ concentration was unchanged throughout both treatments, the plasma K+, Na+ and C1- content increased in proportion to the increase in plasma volume. Muscle water, Na+, and C1- contents were significantly increased (P<.05) were found between the two Na+ diets. Muscle K+, on the other hand, remained unaffected by either the days of heat-exercise stress or the HI-LO diets. Although the LO diet appeared to lessen the subjects' acclimatization to the heat, neither diet affected the body K+ content, nor did they effect the excretion of K+ in urine or sweat. |
Authors
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Costill,David L., Armstrong,Larry |
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Contributors
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BALL STATE UNIV MUNCIE IN HUMAN PERFORMANCE LAB |
Publication Detail
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Publisher : - Type : Text Format : text/html |
Date Detail
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1984-04-30 |
Subject
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BIOCHEMISRTY, STRESS PHYSIOLOGY, *WATER, *SODIUM, *HEAT STRESS(PHYSIOLOGY), *ACCLIMATIZATION, *ELECTROLYTES(PHYSIOLOGY), DEFICIENCIES, MUSCLES, HEART RATE, DIET, CONCENTRATION(CHEMISTRY), POTASSIUM, CHLORINE, BLOOD VOLUME, BODY TEMPERATURE, EXERCISE(PHYSIOLOGY), PERSPIRATION. |
Coverage
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Relation
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Source
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DTIC AND NTIS |
Copyright Information
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APPROVED FOR PUBLIC RELEASE |
Other Details
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Languages : en |
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