Physical activity and mortality in postmenopausal women

JAMA. 1997 Apr 23-30;277(16):1287-92.

Abstract

Objective: To evaluate the association between physical activity and all case mortality in postmenopausal women.

Design: Prospective cohort study with 7 years of follow-up through December 31, 1992.

Setting and participants: Subjects were 40417 postmenopausal Iowa women, aged 55 to 69 years at baseline in 1986. Physical activity was assessed by mailed questionnaire.

Main outcome measure: All-cause mortality (n=2260).

Results: After adjustment for potential confounders and excluding women who reported having cancer or heart disease and those who died in the first 3 years of follow-up, women who reported regular physical activity were at significantly reduced risk of death during follow-up compared with women who did not (relative risk [RR], 0.77; 95% confidence interval [CI], 0.66-0.90). Increasing frequency of moderate physical activity was associated with reduced risk of death during follow-up (from rarely or never engaging in activity to activity at least 4 times per week, RRs, 1.0 [referent], 0.76, 0.70, and 0.62; P value for trend<.001). A similar pattern was seen for vigorous physical activity (corresponding RRs, 1.0, 0.89, 0.74, and 0.57; Pvalue for trend=.06). Reduced risks of death with increased physical activity were evident for cardiovascular diseases (n=729) and respiratory illnesses (n=147). Women who engaged only in moderate but not vigorous physical activity also benefited, with moderate activity as infrequently as once per week demonstrating a reduced mortality risk of 0.78 (95% CI, 0.64-0.96).

Conclusions: These results demonstrate a graded, inverse association between physical activity and all-cause mortality in postmenopausal women. These findings strengthen the confidence that population recommendations to engage in regular physical activity are applicable to postmenopausal women.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aged
  • Exercise*
  • Female
  • Follow-Up Studies
  • Health Status
  • Humans
  • Life Style*
  • Middle Aged
  • Mortality*
  • Multivariate Analysis
  • Postmenopause
  • Proportional Hazards Models
  • Prospective Studies