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What Physicians Should Tell Their Patients

Arch Intern Med. 2005;165:2324-2325.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Regular physical activity is associated with higher levels of physical fitness, particularly aerobic power or cardiorespiratory fitness, favorable chronic-disease risk-factor profiles, reduced risk of clinical events, and greater longevity.^1-4 However, an incomplete understanding still exists as to the specific dose of physical activity, in terms of frequency, intensity, and duration, and the related volume of energy expenditure that is effective in achieving specific biological or clinical outcomes.

The report by Duncan et al⁵ in this issue of the ARCHIVES provides important new information on patterns of exercise intensity and frequency in relation to changes in cardiorespiratory fitness and cardiovascular disease (CVD) risk factors. In this well-designed and well-conducted study, the investigators assigned participants to physician-assisted counseling (the comparison group) or to 1 of 4 intervention groups composed of 2 exercise intensities (45%-55% or 65%-75% of maximal heart rate [HR] reserve) and 2 exercise frequencies (3-4 sessions/wk or 5-7 sessions/wk). . . . [Full Text of this Article]

AUTHOR INFORMATION
Steven N. Blair, PED; Michael J. LaMonte, PhD

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