Article

Amount of Time Spent in Sedentary Behaviors in the United States, 2003-2004

Institute for Medicine and Public Health, Department of Medicine, School of Medicine, Vanderbilt University, Nashville, TN 37232-1738, USA.
American journal of epidemiology (Impact Factor: 4.98). 05/2008; 167(7):875-81. DOI: 10.1093/aje/kwm390
Source: PubMed

ABSTRACT Sedentary behaviors are linked to adverse health outcomes, but the total amount of time spent in these behaviors in the United
States has not been objectively quantified. The authors evaluated participants from the 2003–2004 National Health and Nutrition
Examination Survey aged ≥6 years who wore an activity monitor for up to 7 days. Among 6,329 participants with at least one
10-hour day of monitor wear, the average monitor-wearing time was 13.9 hours/day (standard deviation, 1.9). Overall, participants
spent 54.9% of their monitored time, or 7.7 hours/day, in sedentary behaviors. The most sedentary groups in the United States
were older adolescents and adults aged ≥60 years, and they spent about 60% of their waking time in sedentary pursuits. Females
were more sedentary than males before age 30 years, but this pattern was reversed after age 60 years. Mexican-American adults
were significantly less sedentary than other US adults, and White and Black females were similarly sedentary after age 12
years. These data provide the first objective measure of the amount of time spent in sedentary behavior in the US population
and indicate that Americans spend the majority of their time in behaviors that expend very little energy.

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