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The effect of work level and dietary intake on sweat nitrogen losses in a hot climate

Published online by Cambridge University Press:  09 March 2007

J. S. Weiner ,
J. O. C. Willson ,
Hamad El-Neil  and
Erica F. Wheeler
J. S. Weiner
Affiliation:
MRC Environmental Physiology Research Unit, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT
J. O. C. Willson
Affiliation:
MRC Environmental Physiology Research Unit, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT
Hamad El-Neil
Affiliation:
Department of Physiology, Faculty of Medicine, University of Dar es Salaam
Erica F. Wheeler
Affiliation:
Department of Human Nutrition, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT
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Abstract

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1. Nitrogen intakes, and N output in urine, faeces and sweat have been measured in six young Tanzanian men who were accustomed to a hot climate. The measurements were done while the subjects were receiving first a normal and then a low-N diet; and when they were performing moderate physical work, and had undergone a period of acclimatization.

2. When the subject were acclimatized and working on a normal diet, their sweat output increased, with a fall in its N concentration. Total sweat N loss increased from an average of 0.10 to 0.71 g/d.

3. The effect of the low-N diet was to decrease both the sweat N concentration, and the rate of increase of total N loss in sweat, as sweat volume increased.

4. It is estimated that maximum sweat N losses would not exceed 1 g/d on an adequate diet, or 0.5 g/d on a low-protein diet. Our results provide no basis for recommending extra protein allowances to cover sweat N losses for workers in tropical climates.

Type
Clinical and Human Nutrition
Information
British Journal of Nutrition , Volume 27 , Issue 3 , May 1972 , pp. 543 - 552
Copyright
Copyright © The Nutrition Society 1972

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