31: Objectively Measuring Physical Activity in Early Childhood Using Accelerometers: Are Four Days Enough?

Studies of physical activity (PA) in young children have generally included only participants with at least four days of accelerometer wear-time. It is unclear whether four days characterizes usual PA in children 5 years and under. Investigating this protocol may inform future studies of early childhood obesity. To determine the minimal number of days, and what days, of accelerometer monitoring are needed to reliably estimate usual PA in young …