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 .
Occupational physical activity and breast cancer risk in the upper Cape Cod cancer incidence study.
BACKGROUND In several epidemiological studies , breast cancer risk has been reduced among women who reported high levels of occupational or leisure-time physical activity .  We used data from a population -based case control study to evaluate the effect of occupational physical activity on breast cancer risk . METHODS Two hundred-thirty three incident cases of breast cancer and 670 controls or their next of kin were interviewed for information on breast cancer risk factors and a complete job history .  Physical activity level of jobs were classified using a Department of Labor rating scheme . We calculated adjusted odds ratios for light and medium/heavy activity jobs compared to sedentary jobs . RESULTS Odds ratios for women who held medium/heavy jobs for less than 10 years and more than ten years were , respectively , 0.7 ( 95 % CI = 0.4,1.3 ) and 1.7 ( 95 % CI = 0.9,3.3 ) . CONCLUSIONS In these data there was no evidence that holding a job of medium/heavy activity reduced breast cancer risk . The study was limited by misclassification inherent in the occupational exposure scheme and by the lack of information on leisure time physical activity . The modest risk increase for subjects holding a medium/heavy job for at least 10 years probably represents either confounding or r and om variation
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 .