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 .
Commuting physical activity and risk of colon cancer in Shanghai, China.
Colon cancer incidence rates have been rapidly increasing in Shanghai , China , for reasons still unclear . Low physical activity is a known risk factor for colon cancer . The authors examined the effects of physical activity , particularly commuting physical activity , and its joint effects with body mass index on colon cancer risk in a population -based , case-control study . The study included 931 incident colon cancer patients and 1,552 r and omly selected controls in Shanghai between 1990 and 1993 .  Colon cancer risk was significantly reduced among subjects with high commuting physical activity ( odds ratio ( OR ) = 0.52 , 95 % confidence interval ( CI ) : 0.27 , 0.87 for men ; OR = 0.56 , 95 % CI : 0.21 , 0.91 for women ) , particularly among those who had high commuting physical activity for at least 35 years ( OR = 0.34 , 95 % CI : 0.09 , 0.76 for men ; OR = 0.31 , 95 % CI : 0.07 , 0.72 for women ) . Commuting physical activity significantly modified the risk conferred by high body mass index , with the highest risk observed among those at the highest quintile of body mass index and the lowest activity level ( OR = 6.43 , 95 % CI : 1.82 , 8.54 for men ; OR = 7.42 , 95 % CI : 2.84 , 10.01 for women ) . Our results suggest that regular and frequent physical activity over a long period of time protects from colon cancer and significantly modifies the body mass index-associated risk
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 .