The World Health Organization (WHO)1 and the US Department of Health and Human Services (HHS)2 recommend a minimum of 150 min/wk of moderate-intensity aerobic activity (or 75 min/wk of vigorous-intensity activity). These recommendations suggest that “substantial” health benefits accrue by meeting the recommended minimum level of physical activity and that “additional” benefit can be gained by performing more than the minimum level.1,2 The HHS and WHO guidelines advise that the recommended level of physical activity be spread throughout the week. Because the optimal combination of physical activity frequency, intensity, and duration to reduce mortality risk remains poorly understood, interest is emerging in the relative benefits of compressing recommended levels of activity into 1 to 2 days per week to accommodate time constraints.
Researchers examined data on nearly 64,000 U.K. adults aged 40 and older who reported on their activity level several times from 1994 through 2008. Activity levels were defined as follows:
- Inactive: no moderate-to-vigorous activity
- Insufficiently active: <150 minutes/week of moderate-intensity activity and <75 min/wk of vigorous-intensity activity
- "Weekend warrior": ≥150 min/wk of moderate-intensity or ≥75 min/wk of vigorous-intensity activity from 1–2 sessions
- Regularly active: ≥150 min/wk of moderate-intensity or ≥75 min/wk of vigorous-intensity activity from 3 or more sessions
During some 9 years' follow-up, 8800 participants died, including 2800 from cardiovascular disease (CVD) and 2500 from cancer. Compared with inactive adults, insufficiently active adults and weekend warriors had significant risk reductions in all-cause mortality (about 30%) and CVD mortality (about 40%); regularly active adults had slightly greater risk reductions. Reductions in cancer mortality ranged from 14% for insufficiently active adults to 21% for regularly active adults.
FONTE: JAMA Internal Medicine, January 2017.
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