Deakin University
Browse

File(s) under permanent embargo

A worksite program for overweight middle-aged men achieves lesser weight loss with exercise than with dietary change

Version 2 2024-06-03, 09:49
Version 1 2017-05-09, 15:16
journal contribution
posted on 2024-06-03, 09:49 authored by JE Pritchard, Caryl NowsonCaryl Nowson, JD Wark
OBJECTIVE: To compare changes in total and regional body composition using dual energy X-ray absorptiometry (DEXA) after subjects lost weight through change in diet or exercise. DESIGN: A 12-month, randomized, controlled study of two weight-loss interventions-low-fat diet ad libitum or moderate, unsupervised exercise-in free-living, middle-aged men. Compliance was determined at monthly measurement sessions through food records and activity logs; DEXA scans were performed every 3 months. SUBJECTS/SETTING: Fifty-eight overweight men (mean body mass index = 29.0 +/- 2.6; mean age = 43.4 +/- 5.7 years) recruited from a national corporation were assigned randomly to diet, exercise, or control groups. INTERVENTIONS: One group reduced dietary fat to 26.4% of energy intake but kept activity unchanged; another group self-selected aerobic exercise (three sessions per week at 65% to 75% maximum heart rate) but kept diet unchanged. A control group maintained weight. MAIN OUTCOME MEASURES: At 12 months, measurements of weight, total and regional fat mass and lean mass, energy intake, and percentage dietary fat; physical activity indexes. STATISTICAL ANALYSES: Results were analyzed using paired t tests and analysis of variance. RESULTS: Mean weight loss was 6.4 +/- 3.3 kg in dieters and 2.6 +/- 3.0 kg in exercisers; control subjects maintained weight. DEXA scans revealed that 40% of dieters' weight loss was lean tissue; more than 80% of weight lost by exercisers was fat. Exercisers maintained limb lean tissue and lost fat mass. CONCLUSIONS: Greater total weight and lean tissue loss occurred when subjects lost weight through a low-fat diet consumed ad libitum than when subjects participated in unsupervised aerobic exercise. Use of DEXA enabled identification of progressive total and regional changes in fat and lean tissue.

History

Journal

Journal of the American Dietetic Association

Volume

97

Pagination

37-42

Location

Amsterdam, The Netherlands

ISSN

0002-8223

Language

eng

Publication classification

CN.1 Other journal article

Copyright notice

1997, American Dietetic Association

Issue

1

Publisher

Elsevier

Usage metrics

    Research Publications

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC