Exercise dose and quality of life: a randomized controlled trial

Reference:

Martin, C. K., Church, T. S., Thompson, A. M., Earnest, C. P. and Blair, S. N., 2009. Exercise dose and quality of life: a randomized controlled trial. Archives of Internal Medicine, 169 (3), pp. 269-278.

Related documents:

Official URL:

http://dx.doi.org/10.1001/archinternmed.2008.545

Related URLs:

• http://www.ncbi.nlm.nih.gov/pubmed/19204218/

Abstract

BACKGROUND: Improved quality of life (QOL) is a purported benefit of exercise, but few randomized controlled trials and no dose-response trials have been conducted to examine this assertion. METHODS: The effect of 50%, 100%, and 150% of the physical activity recommendation on QOL was examined in a 6-month randomized controlled trial. Participants were 430 sedentary postmenopausal women (body mass index range, 25.0-43.0 [calculated as weight in kilograms divided by height in meters squared]) with elevated systolic blood pressure randomized to a nonexercise control group (n = 92) or 1 of 3 exercise groups: exercise energy expenditure of 4 (n = 147), 8 (n = 96), or 12 (n = 95) kilocalories per kilogram of body weight per week. Eight aspects of physical and mental QOL were measured at baseline and month 6 with the use of the Medical Outcomes Study 36-Item Short Form Health Survey. RESULTS: Change in all mental and physical aspects of QOL, except bodily pain, was dose dependent (trend analyses were significant, and exercise dose was a significant predictor of QOL change; P < .05). Higher doses of exercise were associated with larger improvements in mental and physical aspects of QOL. Controlling for weight change did not attenuate the exercise-QOL association. CONCLUSION: Exercise-induced QOL improvements were dose dependent and independent of weight change.

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