Department of Quantitative Health Sciences
Behavior and Behavior Mechanisms | Cardiology | Cardiovascular Diseases | Women's Health
BACKGROUND: How physical activity (PA) and sitting time may change after first myocardial infarction (MI) and the association with mortality in postmenopausal women is unknown.
METHODS AND RESULTS: Participants included postmenopausal women in the Women's Health Initiative-Observational Study, aged 50 to 79 years who experienced a clinical MI during the study. This analysis included 856 women who had adequate data on PA exposure and 533 women for sitting time exposures. Sitting time was self-reported at baseline, year 3, and year 6. Self-reported PA was reported at baseline through year 8. Change in PA and sitting time were calculated as the difference between the cumulative average immediately following MI and the cumulative average immediately preceding MI. The 4 categories of change were: maintained low, decreased, increased, and maintained high. The cut points were > /=7.5 metabolic equivalent of task hours/week versus /=8 h/day versus /day for sitting time. Cox proportional hazard models estimated hazard ratios and 95% CIs for all-cause, coronary heart disease, and cardiovascular disease mortality. Compared with women who maintained low PA (referent), the risk of all-cause mortality was: 0.54 (0.34-0.86) for increased PA and 0.52 (0.36-0.73) for maintained high PA. Women who had pre-MI levels of sitting time /day, every 1 h/day increase in sitting time was associated with a 9% increased risk (hazard ratio=1.09, 95% CI: 1.01, 1.19) of all-cause mortality.
CONCLUSIONS: Meeting the recommended PA guidelines pre- and post-MI may have a protective role against mortality in postmenopausal women.
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Copyright 2017 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley. Citation: J Am Heart Assoc. 2017 May 15;6(5). pii: e005354. doi: 10.1161/JAHA.116.005354. Link to article on publisher's site
exercise, mortality, myocardial infarction, physical exercise, sitting time, women
Gorczyca, Anna M.; Eaton, Charles; Lamonte, Michael J.; Manson, JoAnn E.; Johnston, Jeanne D.; Bidulescu, Aurelian; Waring, Molly E.; Manini, Todd; Martin, Lisa W.; Stefanick, Marcia L.; He, Ka; and Chomistek, Andrea K., "Change in Physical Activity and Sitting Time After Myocardial Infarction and Mortality Among Postmenopausal Women in the Women's Health Initiative-Observational Study" (2017). University of Massachusetts Medical School Faculty Publications. 1307.
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