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Physical activity improves protein utilization in young men.

G E Butterfield, D H Calloway

    The British Journal of Nutrition
    |March 1, 1984
    PubMed
    Summary
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    Physical activity impacts protein utilization in young men. Increased activity can enhance nitrogen retention, especially with higher energy intake, despite greater nitrogen losses in sweat and feces.

    Area of Science:

    • Nutrition Science
    • Human Physiology
    • Sports Nutrition

    Background:

    • Understanding protein utilization is crucial for optimizing nutrient intake, particularly in physically active individuals.
    • The interplay between energy availability, physical activity, and protein metabolism requires further investigation.
    • Established safe protein intake levels provide a baseline for studying utilization efficiency.

    Purpose of the Study:

    • To determine how physical activity and energy intake affect protein utilization in young men.
    • To quantify the efficiency of energy intake in improving nitrogen utilization under varying activity levels.
    • To correlate nitrogen balance data with body composition changes.

    Main Methods:

    • Nitrogen balance studies were conducted on young men.

    Related Experiment Videos

  • Protein intake was maintained at the Food and Agriculture Organization/World Health Organization (FAO/WHO) recommended safe level (0.57 g/kg body-weight).
  • Subjects experienced one or two periods of work with adequate and surfeit energy intake.
  • Body composition was assessed using total body potassium and hydrostatic weighing.

    • Main Results:

    • Physical activity negatively impacted protein utilization by increasing sweat and fecal nitrogen losses.
    • Increased physical activity positively influenced protein utilization by supporting higher energy intake.
    • The efficiency of utilizing surplus energy to improve nitrogen retention was greater with increased physical activity.
    • Changes in body composition supported the nitrogen retention findings.

    Conclusions:

    • Physical activity influences protein utilization through nitrogen losses and energy intake modulation.
    • Surplus energy intake enhances nitrogen utilization more effectively under higher physical activity conditions.
    • Body composition changes corroborate the observed effects of physical activity and energy balance on protein metabolism.