Overall , the current literature supports clearly the dose-response relationship between physical activity and the seven chronic conditions identified .
Moreover , higher levels of physical activity reduce the risk for premature all-cause mortality .
The current Canadian guidelines appear to be appropriate to reduce the risk for the seven chronic conditions identified above and all-cause mortality
This systematic review examines critically the scientific basis for Canada 's Physical Activity Guide for Healthy Active Living for adults .
Particular reference is given to the dose-response relationship between physical activity and premature all-cause mortality and seven chronic diseases ( cardiovascular disease , stroke , hypertension , colon cancer , breast cancer , type 2 diabetes ( diabetes mellitus ) and osteoporosis ) .
The strength of the relationship between physical activity and specific health outcomes is evaluated critically .
Leisure-time physical activity and the risk of nonfatal myocardial infarction in postmenopausal women.
BACKGROUND Few studies have examined the association of physical activity with coronary heart disease among women . OBJECTIVE To examine whether participation in physical activity during leisure time decreases the risk of myocardial infa rct ion in postmenopausal women . METHOD A population -based , case-control study among enrollees of the Group Health Cooperative of Puget Sound , a health maintenance organization based in Seattle , Wash. Cases were postmenopausal women who sustained an incident nonfatal myocardial infa rct ion during the period 1986 through 1991 . Controls were a r and om sample of Group Health Cooperative enrollees who were frequency matched to the cases by age and calendar year . Participation in physical activity during leisure time was assessed from a telephone interview .  A total of 268 cases and 925 controls were interviewed . RESULTS After adjustment for potential confounding factors , the odds ratios for nonfatal myocardial infa rct ion for women in the second , third , and fourth quartile of total energy expenditure , relative to women in the first quartile , were 0.52 ( 95 % confidence interval , 0.34 to 0.80 ) , 0.40 ( 95 % confidence interval , 0.26 to 0.63 ) , and 0.40 ( 95 % confidence interval , 0.25 to 0.63 ) , respectively . Similar odds ratios were associated with the energy expended in nonstrenuous leisure-time physical activity , and with walking for exercise . CONCLUSION This case-control study suggests that the risk of myocardial infa rct ion among postmenopausal women is decreased by 50 % with modest leisure-time energy expenditures , equivalent to 30 to 45 minutes of walking for exercise three times a week
Overall , the current literature supports clearly the dose-response relationship between physical activity and the seven chronic conditions identified .
Moreover , higher levels of physical activity reduce the risk for premature all-cause mortality .
The current Canadian guidelines appear to be appropriate to reduce the risk for the seven chronic conditions identified above and all-cause mortality
This systematic review examines critically the scientific basis for Canada 's Physical Activity Guide for Healthy Active Living for adults .
Particular reference is given to the dose-response relationship between physical activity and premature all-cause mortality and seven chronic diseases ( cardiovascular disease , stroke , hypertension , colon cancer , breast cancer , type 2 diabetes ( diabetes mellitus ) and osteoporosis ) .
The strength of the relationship between physical activity and specific health outcomes is evaluated critically .