Frequent and occasional physical activity in the elderly: a 12-year follow-up study of mortality.
BACKGROUND
The positive health effects of physical activity are well known. However, there are few studies of the association between different levels of physical activity and all-cause mortality among elderly people.


METHODS
A national random sample of 3206 women and men aged >/=65 were interviewed in 1988 and 1989 and followed until December 31, 2000, for all-cause mortality. Cox regression was used to analyze the association between five different levels of physical activity and all-cause mortality, after adjustment for gender, age, education, smoking habits, body mass index, diabetes, hypertension, and self-rated health. All analyses were conducted in 2003.


RESULTS
For elderly people who were physically active occasionally, the risk of all-cause mortality was 28% lower than for those who were physically inactive (hazard ratio [HR]=0.72; confidence interval [CI]=0.64-0.81), after adjustment for all explanatory variables. For those who were physically active once a week, the risk of all-cause mortality was 40% lower than for those who were physically inactive (HR=0.60; CI=0.50-0.71). For those who were physically active more frequently, the reduction in all-cause mortality risk was about the same as for those who were physically active once a week. Diabetes, hypertension, and daily smoking were, as expected, significant risk factors for all-cause mortality.


CONCLUSIONS
Physical activity, even occasionally, decreases the risk of all-cause mortality among elderly people. Preventive resources among the elderly should include moderate exercise such as walking.
Sundquist
Kristina
K
Karolinska Institutet, Family Medicine, Stockholm, Sweden. Kristina.Sundquist@klinvet.ki.se
Qvist
Jan
J
Sundquist
Jan
J
Johansson
Sven-Erik
SE
D000368:Aged; D000369:Aged, 80 and over; D003920:Diabetes Mellitus / Q000401:mortality; D005260:Female; D005500:Follow-Up Studies; D006306:Health Surveys; D006801:Humans; D006973:Hypertension / Q000401:mortality; D008297:Male; D009026:Mortality; D009043:Motor Activity; D012307:Risk Factors; D012494:Sampling Studies; D012907:Smoking / Q000401:mortality; D013548:Sweden / Q000453:epidemiology