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 .
Obesity, physical activity, and mortality in a prospective chinese elderly cohort.
BACKGROUND In older people , it is unclear whether obesity relates to mortality , which calls into question its etiologic role in disease and its public health relevance . This apparent lack of relationship in older people could be an artifactual result of their diverse health states . METHODS We used Cox regression analysis to determine whether the effect of body mass index ( BMI ) ( calculated as weight in kilograms divided by the square of height in meters ) or physical activity on mortality varied with health status in a prospect i ve cohort study of Chinese people 65 years or older enrolled from 1998 to 2000 at all of the 18 Elderly Health Centers of the Hong Kong Government Department of Health . Health status was categorized into 5 morbidity groups using a 12-item index covering illnesses , medications , frailty , and smoking . RESULTS After a mean follow-up of 4.1 years , there were 3819 deaths in 54 088 subjects ( 96.5 % successful follow-up ) . The effect of BMI on mortality varied with baseline health status ( P<.001 ) . In the healthiest group , obese people ( BMI > /=25 ) had higher mortality ( adjusted hazard ratio [ HR ] , 1.54 ; 95 % confidence interval [ CI ] , 1.02 - 2.33 ) , but in the unhealthiest group they had lower mortality ( HR , 0.55 ; 95 % CI , 0.49 - 0.63 ) compared with subjects of normal weight . Daily physical activity was associated with lower mortality compared with inactivity in the unhealthiest group ( HR , 0.70 ; 95 % CI , 0.61- 0.81 ) but not in the healthiest group . CONCLUSIONS In the elderly , the relationship between obesity and mortality varies according to the underlying health status . In those with poor health status , obesity is associated with better outcome , whereas in those with initially good health status , obesity is associated with worse outcome
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 .