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Clinical Care/Education/Nutrition

Effects of an Energy-Restrictive Diet With or Without Exercise on Abdominal Fat, Intermuscular Fat, and Metabolic Risk Factors in Obese Women

  1. Ian Janssen, PHD1,
  2. Anne Fortier, MSC1,
  3. Robert Hudson, MD, PHD2 and
  4. Robert Ross, PHD12
  1. 1School of Physical and Health Education, Queen’s University, Kingston, Ontario, Canada
  2. 2School of Medicine, Division of Endocrinology and Metabolism, Queen’s University, Kingston, Ontario, Canada
    Diabetes Care 2002 Mar; 25(3): 431-438. https://doi.org/10.2337/diacare.25.3.431
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    Abstract

    OBJECTIVE—The primary objective was to examine whether the combination of diet and aerobic exercise (DA) or diet and resistance exercise (DR) is associated with greater improvements in metabolic risk factors by comparison to diet only (DO) in obese women. A second objective considered whether reductions in metabolic risk factors are related to concurrent changes in abdominal and/or intermuscular fat distribution.

    RESEARCH DESIGN AND METHODS—A total of 38 premenopausal obese women were randomly assigned to one of three 16-week treatments: DO (n=13), DA (n=11), or DR (n=14). Plasma glucose, insulin, and lipid levels were measured in a fasting state and after a 75-g oral glucose challenge (oral glucose tolerance test [OGTT]). Total, abdominal subcutaneous, visceral, and intermuscular fat were measured by magnetic resonance imaging.

    RESULTS—Significant reductions (P < 0.02) in body weight (∼10 kg or 10%) and in total, abdominal subcutaneous, visceral, and intermuscular fat were observed within each group. Fasting and OGTT insulin, total cholesterol, LDL cholesterol, and apolipoprotein B also decreased within each group (P ≤ 0.02). The changes in the body fat and metabolic variables were not different across treatment (P > 0.05). Visceral fat alone was related to the metabolic risk factors both before and after the treatment.

    CONCLUSIONS—Weight loss was associated with reductions in metabolic risk factors in obese women. The improvement in the metabolic profile was not enhanced by the addition of aerobic or resistance exercise. The findings reinforce the importance of diminished visceral fat in the treatment of insulin resistance.

    • DA, diet and aerobic exercise
    • DO, diet only
    • DR, diet and resistance exercise
    • MRI, magnetic resonance imaging
    • OGTT, oral glucose tolerance test
    • WHR, waist-to-hip ratio

    Footnotes

    • Address correspondence and reprint requests to Robert Ross, PhD, School of Physical and Health Education, Queen’s University, Kingston, Ontario, Canada, K7L 3N6. E-mail: rossr{at}post.queensu.ca.

      Received for publication 23 May 2001 and accepted in revised form 15 November 2001.

      R.H. has received financial support from Novo Nordisk.

      A table elsewhere in this issue shows conventional and Système International (SI) units and conversion factors for many substances.

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    Effects of an Energy-Restrictive Diet With or Without Exercise on Abdominal Fat, Intermuscular Fat, and Metabolic Risk Factors in Obese Women
    Ian Janssen, Anne Fortier, Robert Hudson, Robert Ross
    Diabetes Care Mar 2002, 25 (3) 431-438; DOI: 10.2337/diacare.25.3.431

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    Effects of an Energy-Restrictive Diet With or Without Exercise on Abdominal Fat, Intermuscular Fat, and Metabolic Risk Factors in Obese Women
    Ian Janssen, Anne Fortier, Robert Hudson, Robert Ross
    Diabetes Care Mar 2002, 25 (3) 431-438; DOI: 10.2337/diacare.25.3.431
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