Abstract: This study examines time-use for outdoor recreation during 1965 to 2007. Using data on over 47,000 individuals from six nationally representative time-use surveys, we first document time-use trends between 1965 and 2007. We then develop a two-part instrumental variable censored regression model (a hurdle model) to predict individual-level time-use. Our results show that per capita time-use in outdoor recreation has more than doubled since 1965. This long-term increase was driven largely by increased participation rate. However, in the last decade or two, per capita time-use in outdoor recreation has stayed constant or slightly decreased. This change was driven mostly by reduced time-use by active participants; participation rate has not changed considerably. Demographics, amount of leisure, and other factors all have contributed to changes over time, but their effects and relative importance vary between participation, time-use per active participant, and time periods.

Abstract: The research literature on outdoor recreation as it relates to human health is vast and growing. To help policymakers take new and emerging findings into account when designing recreation and park services and initiatives for the 21st century, this paper summarizes the salient issues and identifies research gaps. It considers how being outside in natural surroundings may improve health and how outdoor physical activities benefit participants. Particular attention is given to children’s health problems that can be mitigated through outdoor play, sports, and nature study. The paper describes approaches to measuring physical activity and recent trends in park visitation and outdoor activity participation. It looks at variables that affect participation in outdoor activities and considers the projected demographic changes that will affect policymaking in this arena. The findings of this literature review point to potential new directions for outdoor recreation policy, as well as new policy questions to be explored.