PHYSICAL-ACTIVITY IN OLDER MIDDLE-AGED MEN AND REDUCED RISK OF STROKE- THE HONOLULU-HEART-PROGRAM

From 1965 to 1968, the Honolulu Heart Program began following 8,006 me n in a prospective study of cardiovascular disease. At the time of stu dy enrollment, an estimate of current 24-hour habitual physical activi ty was collected from each subject. On the basis of a calculated physi cal activity index, subjects were classified as being inactive, partia lly active, or active. This report examines the relation between the l evels of physical activity and stroke that occurred among 7,530 of the men over 22 years of follow-up. Risk of stroke was examined separatel y in younger (45-54 years) middle-aged men and older (55-68 years) mid dle-aged men. Among the older men, those who were inactive or partiall y active experienced a three- to fourfold excess incidence of hemorrha gic stroke as compared with active men (p < 0.01). There was a two- to threefold excess of intracerebral hemorrhage in men who were inactive or partially active as compared with those who were active (p < 0.05) . An excess of subarachnoid hemorrhage was observed in inactive older men, with only one event occurring in those who were active (p < 0.05) . After exclusion of subjects with hypertension, diabetes mellitus, an d left ventricular hypertrophy, the relative risk of hemorrhagic strok e for inactive men versus active men was 3.7 (95% confidence interval (CI) 1.3-10.4). In older men who did not smoke cigarettes, the relativ e risk of thromboembolic stroke among inactive men versus active men w as 2.8 (95% CI 1.2-6.7), and when partially active older men were comp ared with those who were active, the relative risk was 2.4 (95% CI 1.0 -5.7). These findings persisted after control for the residual effects of systolic blood pressure and other risk factors for stroke. Benefit s of physical activity in reducing the risk of thromboembolic stroke w ere not observed in men who smoked cigarettes. The authors conclude th at physical activity may be important in reducing the risk of stroke, particularly among nonsmoking men in older middle age.