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Physical activity improves protein utilization in young men

Published online by Cambridge University Press:  09 March 2007

Gail E. Butterfield and
Doris H. Calloway
Gail E. Butterfield
Affiliation:
Department of Nutritional Sciences, University of California, Berkeley, California 94720, USA
Doris H. Calloway
Affiliation:
Department of Nutritional Sciences, University of California, Berkeley, California 94720, USA
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Abstract

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1. Protein utilization in young men under circumstances of one or two periods of work and both adequate and surfeit energy intake was determined by nitrogen balance; protein intake was constant at the FAO/WHO (1973) safe level (0.57 g/kg body–weight).

2. Physical activity affected protein utilization negatively by increasing sweat and faecal N losses, and positively by supporting increased energy intake.

3. Efficiency with which surfeit energy improved N utilization (mg N retained/added kJ) was greater under circumstances of increased activity.

4. Changes in body composition as determined by total body potassium and hydrostatic weighing supported the N retention values.

Information

Type
Papers of direct relevance to Clinical and Human Nutrition
Information
British Journal of Nutrition , Volume 51 , Issue 2 , March 1984, pp. 171 - 184
Copyright
Copyright © The Nutrition Society 1984

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