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 .
Occurrence of Breast Cancer in Relation to Recreational Exercise in Women Age 50‐64 Years
& NA ; To investigate the relation between recreational physical activity and breast cancer , we conducted an analysis of a population ‐based case‐control study of women age 50‐64 years in western Washington State . The study included 537 patients with breast cancer diagnosed during 1988‐1990 and 492 r and omly selected population control women . Detailed information on recreational exercise habits and other risk factors for breast cancer was ascertained by structured in‐person interviews . A similar proportion of cases and controls reported exercise in the 2 years before the referent date ( about 50 % ) , or during ages 12‐21 years ( about 40 % ) . Compared with women who reported no exercise , there was a slightly decreased risk of breast cancer in women who exercised more than 1.5 hours per week in the 2 years before diagnosis ( cases ) or referent date ( controls ) [ odds ratio ( OR ) = 0.7 ; 95 % confidence interval ( CI ) = 0.4‐1.1 ] , or who engaged in at least some high‐intensity exercise ( OR = 0.7 ; 95 % CI = 0.4‐1.1 ) , but there was no clear decline in risk at the highest categories of duration or intensity . There was no association between  any intensity exercise at ages 12‐21 years and risk of breast cancer . These results indicate a weak negative association between physical activity and risk of breast cancer in middle‐aged women
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 .