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We investigated the population trajectory of leisure time physical activity (LTPA) in adults age 18 to 60 y (n = 881), who were recruited in 1981 for the Canada Fitness Survey and followed-up through the Campbell’s Survey on Well-Being (1988) and the Physical Activity Longitudinal Study (2002/04).
Data on involvement in LTPA were collected by questionnaire and used to estimate average daily energy expenditure (EE) (kcal · kg-1 · d-1) during leisure time. Growth trajectory modeling was used to describe the overall population trajectory of LTPA and the extent to which average trajectories varied between sub-groups defined by age, sex, and education.
The population trajectory of LTPA over time was modified by baseline age, but not by sex or by level of education. Disparities in LTPA related to sex and education persisted over two decades.
This longitudinal investigation improves our understanding of the processes underlying patterns of LTPA in adults.
Barnett and Gauvin are with the Dept of Social and Preventive Medicine, Groupe de Recherche Interdisciplinaire de Santé, and the Centre de Recherche Léa-Roback sur les Inégalités Sociales de Santé de Montréal, Université de Montréal, Montreal, PQ H3C 3J7. Craig is with the Canadian Fitness and Lifestyle Research Institute and the Faculty of Applied Health Sciences, University of Waterloo, Waterloo, ON N2L 3G1. Katzmarzyk is with the School of Kinesiology and Health Studies and Dept of Community Health and Epidemiology, Queen’s University, Kingston, ON K7L 3N6.