Natural Play, Healthy Play: Environmental Determinants of Young Children's Outdoor Physical Activity

Abstract

The prevalence of obesity among young children has markedly increased over the past two decades, with more than one-third of American preschoolers now overweight or obese and at risk for lifelong health problems. Physical activity is a recommended obesity prevention strategy, yet preschoolers typically fail to meet recommended daily physical activity guidelines, spending just 15 minutes engaged in moderate to vigorous physical activity, compared to six sedentary hours daily. Unstructured play in settings with varied features, such as childcare center playgrounds, potentially plays a significant role in increasing the amount of time preschoolers spend in moderate-to-vigorous physical activity (MVPA). The purposes of this study were first, to compare the intensity and type of preschoolers' physical activity across four distinctly different outdoor play settings; second, to identify particular features in each play setting associated with MVPA and sedentary behavior; and, third, to identify, test, and evaluate environmental modifications to increase preschoolers' MVPA in outdoor play settings. Seventeen 3-5 year-old children participated in repeated unstructured play sessions featuring 16 min of play in each of 4 novel settings: a traditional climber, a wooded natural area, a garden, and an adventure, or "loose parts" playground. Interventions to increase physical activity were introduced to the adventure playground during the first two phases, and to all four settings during the third phase. Physical activity intensity was measured using ActiGraph GT3x+ activity monitors and contextual information concerning motor skills was obtained by trained observers using the System for Observing Play and Recreation in Communities (SOPARC), adapted to the age and environment of the study. Results show that both play setting design theme and the composition of specific play features within the setting impact the type of motor skills children perform and the amount of MVPA young children accumulate during unstructured play. Findings additionally demonstrate that simple, low-cost modifications to play settings can increase MVPA for targeted subgroups and individual children; outcomes were setting-specific. Study results may be useful to public health and medical workers, parents, educators, playground designers, community planners, and policy makers who focus on increasing preschool children's daily MVPA and decreasing childhood obesity.