Margaret A.WinkerMD, Deputy EditorIndividualAuthorPhil B.FontanarosaMD, Interim CoeditorIndividualAuthor
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.
Williams PT. Lifestyle and Structured Interventions to Increase Physical Activity. JAMA. 1999;282(16):1515-1517. doi:10.1001/jama.282.16.1515