The primary purpose of this narrative review was to evaluate the current literature and to
provide further insight into the role physical inactivity plays in the development of chronic …

Importance It is unclear whether, for the same amount of total physical activity, a higher
proportion of vigorous physical activity (VPA) to total physical activity is associated with a …

Objectives. We examined the association of intensity and type of physical activity with
mortality. Methods. We assessed the duration of physical activity by intensity level and type …

Objectives: To examine any association between social, productive, and physical activity
and 13 year survival in older people. Design: Prospective cohort study with annual mortality …

MMWR/May 3, 2013/Vol. 62/No. 17 327 muscle-strengthening guidelines (27.4%); this
decreased by decreasing education levels, with persons who had less than a high school …

Background Although previous studies have found physical activity to be associated with
lower mortality, the dose–response relationship remains unclear. In this systematic review …

Objective To examine how change in level of physical activity after middle age influences
mortality and to compare it with the effect of smoking cessation. Design Population based …

Background Physical activity has a protective effect against cardiovascular disease (CVD) in
high-income countries, where physical activity is mainly recreational, but it is not known if …

Recent epidemiological and clinical evidence support this observation by the 18th century
Scottish physician Dr William Buchan. Studies suggest causal associations between regular …

This review of the literature provides an update on the scientific biological and psychosocial
bases for Canada's physical activity guide for healthy active living, with particular reference …