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October 27, 1999

Lifestyle and Structured Interventions to Increase Physical Activity

Author Affiliations

Copyright 1999 American Medical Association. All Rights Reserved. Applicable FARS/DFARS Restrictions Apply to Government Use.1999

JAMA. 1999;282(16):1515-1517. doi:10.1001/jama.282.16.1515

To the Editor: Dr Dunn and colleagues1 compared the benefits of incorporating moderate-intensity physical activity into one's daily routine (lifestyle approach) with those of a structured, fitness center–based exercise program. After 6 months, the structured program increased in cardiorespiratory fitness nearly 3-fold more than the lifestyle program.2 Between 6 and 24 months, participants in the structured program lost some of their initial fitness gain, leading the authors to conclude that "a lifestyle physical activity intervention is as effective as a structured exercise program in improving physical activity, cardiorespiratory fitness, and blood pressure." However, differences in the delivery of the intervention between groups could weaken this conclusion.