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

(2008) C. E. Matthews et al.   AMERICAN JOURNAL OF EPIDEMIOLOGY

Breaks in Sedentary Time: Beneficial associations with metabolic risk

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A comparison of direct versus self-report measures for assessing physical activity in adults: a systematic review

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International prevalence of physical activity in youth and adults

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