Physical activity of Canadian children and youth: accelerometer results from the 2007 to 2009 Canadian Health Measures Survey.

Background Physical activity is an important determinant of health and fi tness. This study provides contemporary estimates of the physical activity levels of Canadians aged 6 to 19 years. Data and methods Data are from the 2007 to 2009 Canadian Health Measures Survey. The physical activity of a nationally representative sample was measured using accelerometers. Data are presented as time spent in sedentary, light, moderate and vigorous intensity movement, and in steps accumulated per day. Results An estimated 9% of boys and 4% of girls accumulate 60 minutes of moderate-to-vigorous physical activity on at least 6 days a week. Regardless of age group, boys are more active than girls. Canadian children and youth spend 8.6 hours per day—62% of their waking hours—in sedentary pursuits. Daily step counts average 12,100 for boys and 10,300 for girls. Interpretation Based on objective and robust measures, physical activity levels of Canadian children and youth are low. Keywords Actical, pedometer, sedentary behaviour, obesity, public health, motion sensor