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Does the intensity of an exercise programme modulate body composition changes?

V Mougios1, M Kazaki, K Christoulas

  • 1Laboratory of Sport Hygiene and Nutrition, Department of Physical Education and Sport Science, Aristotle University of Thessaloniki, Thessaloniki, Greece. mougios@phed.auth.gr

International Journal of Sports Medicine
|March 17, 2006
PubMed
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Lower intensity exercise resulted in greater weight loss, while higher intensity exercise helped preserve fat-free mass in women. Both exercise intensities can be beneficial for weight management goals.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Body Composition Analysis

Background:

  • Exercise training is a key component of weight maintenance programs.
  • The impact of exercise intensity on body composition changes, beyond total energy expenditure, requires further clarification.

Purpose of the Study:

  • To compare the effects of two isoenergetic exercise training programs of differing intensities on body composition.
  • To investigate whether exercise intensity influences weight loss and body mass components.

Main Methods:

  • Fourteen healthy premenopausal untrained women were divided into two groups.
  • Both groups underwent treadmill exercise training for three months, four times weekly, expending 1548 kJ (370 kcal) per session.
  • One group exercised at 45% of maximal oxygen uptake (V(O2max)), while the other exercised at 72% of V(O2max).

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Main Results:

  • Body mass decreased significantly in both groups, with greater loss in the low-intensity group (3.3 kg) compared to the high-intensity group (1.9 kg).
  • Fat mass decreased significantly in both groups, with no significant difference between them.
  • Fat-free mass showed no significant change in either group, but a trend towards preservation was observed in the high-intensity group (p=0.058).

Conclusions:

  • Exercise training at 45% of V(O2max) led to greater weight loss than at 72% of V(O2max) without dietary changes.
  • Higher intensity exercise (72% V(O2max)) tended to better maintain fat-free mass, potentially due to the lower overall weight loss.
  • Both low and high-intensity exercise programs can be beneficial for weight management, depending on the primary goal (weight loss vs. fat-free mass preservation).