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 .
Physical activity and the risk of colon cancer among women: a prospective cohort study (United States).
Physical activity has frequently been reported to decrease the risk of colon cancer in men , but data on the relation of physical activity to  colon cancer risk in women have generally been less consistent . To further investigate the relationship of physical activity with  colon cancer risk in women , we studied a cohort of 31,783 US women participating in the Breast Cancer Detection Demonstration Project Follow-up Study . Information on daily physical activity over the past year was ascertained using a self-administered question naire at study baseline . The Cox proportional hazards model was used to estimate relative risks ( RRs ) relating physical activity to the risk of incident colon cancer . During 270,325 person-years of follow-up , 243 colon cancer cases were identified . No association was observed between  physical activity  and the subsequent risk of colon cancer . The multivariable RRs of colon cancer across increasing quintiles of total physical activity were 1.0 , 1.45 , 1.16 , 1.27 and 1.15 ( 95 % CI : 0.76 , 1.75 ; p(trend ) = 0.77 ) . The multivariable RRs comparing women at the extremes of moderate and vigorous physical activity , respectively , were 1.07 ( 95 % CI : 0.70 , 1.62 ) and 1.10 ( 95 % CI : 0.78 , 1.55 ) . The relationship between  physical activity and colon cancer risk did not vary by anatomic subsite or across subgroups defined by age , body mass , dietary fiber intake , menopausal status , menopausal hormone use or aspirin use . The results of this large prospect i ve cohort study among women do not support the hypothesis that physical activity is related to a lower incidence of colon cancer
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 .