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Lower extremity muscle size and strength and aerobic capacity decrease with caloric restriction but not with

Edward P Weiss1, Susan B Racette, Dennis T Villareal

  • 1Division of Geriatrics and Nutritional Sciences, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA. eweiss4@slu.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 11, 2006
PubMed
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Caloric restriction leads to muscle loss and reduced strength, while exercise-induced weight loss preserves or improves these parameters. Exercise is superior for maintaining physical capacity during weight loss.

Area of Science:

  • Exercise physiology
  • Human metabolism
  • Sports science

Background:

  • Caloric restriction (CR) causes fat loss but may also lead to muscle mass reduction, decreasing strength and aerobic capacity (VO2 max).
  • Exercise-induced weight loss (EX) might counteract these effects due to exercise's anabolic impact on muscles.

Purpose of the Study:

  • To test if CR reduces muscle size, strength, and VO2 max, while EX preserves or improves these metrics.
  • Investigate the long-term effects of CR versus EX on body composition and physical performance in middle-aged adults.

Main Methods:

  • 12-month study comparing CR (n=18) and EX (n=16) in healthy men and women (50-60 years old).
  • Assessed lean mass (DXA), thigh muscle volume (MRI), knee flexor strength (dynamometry), and maximal oxygen uptake (VO2 max).

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Main Results:

  • Both groups lost weight and lean mass similarly.
  • CR group showed significant decreases in thigh muscle volume and strength.
  • CR group experienced reduced absolute VO2 max, while the EX group significantly increased absolute and relative VO2 max.

Conclusions:

  • CR for 12 months decreases muscle mass and physical work capacity.
  • Weight loss through exercise preserves or enhances muscle mass and physical performance.
  • Exercise is a more effective strategy for maintaining physical capacity during weight loss compared to CR.