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To examine 45-year trends in time use and physical activity energy expenditure (PAEE) in a nationally representative sample of US mothers.We quantified time allocation to physical activity (PA), sedentary behaviors (SED), and PAEE from 1965 to 2010 in mothers with older children (MOC) (>5 to ≤18 years) and mothers with younger children (MYC) (≤5 years). Physical activity was the sum of time allocated...
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