Outdoor play in children: associations with objectively-measured physical activity, sedentary behavior and weight status

Abstract

Objectives: To determine the amount of time children play outdoors and examine associations with weekday, weekend and after-school physical activity (PA), sedentary behavior (SB), and weight-status (normal-weight, overweight/obese).

Methods: Data were extracted from Project BEAT (Toronto, 2010-2011; www.beat.utoronto.ca). Children's (n=856; mean age=11±0.6years) PA and SB were measured using accelerometry. Outdoor play (OP) was assessed via parental report and collapsed into three categories (<1h/day, 1-2h/day, >2h/day) and differences in anthropometric and PA characteristics were assessed.

Results: 55.1%, 37.2%, and 7.7% of children played outdoors for <1h/day, 1-2h/day and >2h/day, respectively, on weekdays. OP was higher on weekends and in boys. OP was associated with SB, light PA and MVPA at all time-points, whereby children attaining <1h/day had lower activity profiles. Boys playing outdoors for <1h/day were more likely to be overweight/obese and had lower PA levels than normal weight boys. However, overweight/obese boys who spent >2h/day playing outdoors had PA profiles similar to normal weight counterparts.

Conclusion: Encouraging children to spend more time outdoors may be an effective strategy for increasing PA, reducing SB, and preventing excess weight gain (particularly boys' play).

Keywords: Accelerometer; Child; Health; Outdoor play; Overweight.