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Exercise affects protein utilization in healthy children.

D R Bolster1, M A Pikosky, L M McCarthy

  • 1Department of Nutritional Sciences, University of Connecticut, Storrs, CT 06269, USA.

The Journal of Nutrition
|October 5, 2001
PubMed
Summary
This summary is machine-generated.

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Programmed aerobic exercise in children improved nitrogen balance, indicating better protein utilization. This study shows exercise impacts protein metabolism, suggesting a need to re-evaluate nutrient needs for active children.

Area of Science:

  • Pediatric Exercise Physiology
  • Nutritional Biochemistry
  • Sports Science

Background:

  • Health initiatives encourage physical activity in children, but its physiological effects, particularly on protein metabolism, are not fully understood.
  • Understanding how exercise impacts protein utilization is crucial for optimizing growth and development in pediatric populations.

Purpose of the Study:

  • To investigate the effects of a 6-week programmed aerobic exercise intervention on whole-body protein metabolism in healthy children.
  • To assess changes in nitrogen balance, protein synthesis, and protein breakdown in response to aerobic exercise.

Main Methods:

  • Seven healthy children (5 boys, 2 girls) participated in a 6-week walking program (5 days/week).
  • Protein metabolism was assessed using the (15)N-glycine methodology, measuring nitrogen balance, nitrogen flux (Q), protein synthesis (PS), and protein breakdown (PB) before and after the intervention.

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  • Dietary intake and anthropometric measurements were monitored throughout the study.

    • Main Results:

    • While body weight, fat-free mass, and body fat percentage remained unchanged, height significantly increased post-intervention.
    • Energy and protein intake were consistent, but nitrogen balance became significantly more positive after the exercise program.
    • A significant decrease in nitrogen flux (Q) was observed, accompanied by significant reductions in both protein synthesis (PS) and protein breakdown (PB).

    Conclusions:

    • This study provides the first evidence that programmed aerobic exercise alters whole-body protein utilization in healthy, nonobese children.
    • The findings suggest that increased physical activity may lead to more efficient protein utilization.
    • Further longitudinal research is needed to fully understand these changes, and current nutrient recommendations may need re-evaluation for active children.