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.
Blair SN, LaMonte MJ. How Much and What Type of Physical Activity Is Enough? What Physicians Should Tell Their Patients. Arch Intern Med. 2005;165(20):2324–2325. doi:10.1001/archinte.165.20.2324
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