This release is available in French.
Montreal, March 31, 2009 Although winter's grasp has subsided to spring, its effects could have a long term impact on the exercise patterns of teenagers. According to a five-year study published in the Annals of Epidemiology, while teens are generally more active in warmer months, significant drops in physical activity during winter months contributes to a general slowdown in exercise habits throughout adolescence that could persist over time.
Study investigators from the Centre de Formation Mdicale du Nouveau-Brunswick of the Universit de Moncton and Universit de Sherbrooke, the Universit de Montral and McGill University counter that declines in physical activity could be offset by promoting a diversity of physical activities including those that can be enjoyed during winter.
"While physical activity augments in spring and summer, these increases do not compensate for winter drop offs, which contribute to declining physical activity throughout adolescence," says Mathieu Blanger, lead author of the study, research director at the Centre de formation mdicale du Nouveau-Brunswick and epidemiologist at the Centre de recherche Beausejour. "Throughout our five-year study, the average daily number of physical activity sessions among participants decreased by nearly one third. The sharpest declines occurred during the coldest months."
As part of the study, 1293 students initially aged 12 to 13 years were monitored from grade 7 to grade 11. Participants were recruited from 10 schools in the Montreal area and were asked to report involvement in physical activity over different seasons. Results were then compared to weather data from Environment Canada.
"Poor weather is one of the most frequently reported barriers to the practice of physical activity," says Jennifer O'Loughlin a researcher from the Universit de Montral's department of social and preventive medicine Centre Hospitalier de l'Universit de Montral.
"In this study we found weather conditions did affect participation in physical activities, but the effects of climate were very modest, suggesting the impact of seasons on physical activity is not solely related to weather changes," says O'Loughlin.
Blanger and colleagues hypothesised that weather curtailed spontaneous and unplanned physical activities among teens, since adolescents favour structured activities. What's more, planned activities unfold to preset schedules and are less likely to be cancelled because of inclement weather.
The research team advises that winter activities of all types be promoted to curb drops in physical activity among teens. "We are not advocating that indoor physical activities be preferred to outdoor activities, simply that efforts be made to ensure that a variety of activities be available during winter," cautions Blanger.
|Contact: Sylvain-Jacques Desjardins|
University of Montreal