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Exercise and body composition.

G B Forbes1

  • 1Department of Pediatrics, University of Rochester School of Medicine and Dentistry, New York 14642.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1991
PubMed
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Young adults exercising gained lean body mass (LBM) with weight gain and lost LBM with weight loss. Body fat content influenced body composition changes in exercising individuals.

Area of Science:

  • Exercise physiology
  • Body composition analysis
  • Human metabolism

Background:

  • Understanding how exercise impacts body composition is crucial for health and performance.
  • Previous research indicates varied effects of exercise on lean body mass (LBM) and fat mass.

Purpose of the Study:

  • To assess changes in body composition in young adults undertaking exercise programs.
  • To determine the relationship between weight change and lean body mass (LBM) changes.
  • To investigate the influence of body fat content on exercise-induced body composition alterations.

Main Methods:

  • Assessed body composition changes in 41 young adults on ad libitum diets during various exercise programs.
  • Analyzed the relationship between weight change and LBM change using regression analysis.

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  • Reviewed and analyzed published data to corroborate findings.

    • Main Results:

    • Most participants who gained weight experienced an increase in LBM.
    • Most participants who lost weight experienced a loss in both LBM and fat mass.
    • A direct relationship was observed between LBM change and weight change (regression slope of 0.500).

    Conclusions:

    • Weight changes in exercising young adults are closely linked to alterations in lean body mass (LBM).
    • Body fat percentage influences the extent of body composition changes resulting from exercise.
    • Findings are consistent with existing literature and highlight the role of body fat in modulating exercise adaptations.