Response to letter regarding article, "physical activity and heart rate variability in older adults: the cardiovascular health study".
نویسندگان
چکیده
BACKGROUND Cardiac mortality and electrophysiological dysfunction both increase with age. Heart rate variability (HRV) provides indices of autonomic function and electrophysiology that are associated with cardiac risk. How habitual physical activity among older adults prospectively relates to HRV, including nonlinear indices of erratic sinus patterns, is not established. We hypothesized that increasing the levels of both total leisure-time activity and walking would be prospectively associated with more favorable time-domain, frequency-domain, and nonlinear HRV measures in older adults. METHODS AND RESULTS We evaluated serial longitudinal measures of both physical activity and 24-hour Holter HRV over 5 years among 985 older US adults in the community-based Cardiovascular Health Study. After multivariable adjustment, greater total leisure-time activity, walking distance, and walking pace were each prospectively associated with specific, more favorable HRV indices, including higher 24-hour standard deviation of all normal-to-normal intervals (Ptrend=0.009, 0.02, 0.06, respectively) and ultralow-frequency power (Ptrend=0.02, 0.008, 0.16, respectively). Greater walking pace was also associated with a higher short-term fractal scaling exponent (Ptrend=0.003) and lower Poincaré ratio (Ptrend=0.02), markers of less erratic sinus patterns. CONCLUSIONS Greater total leisure-time activity, and walking alone, as well, were prospectively associated with more favorable and specific indices of autonomic function in older adults, including several suggestive of more normal circadian fluctuations and less erratic sinoatrial firing. Our results suggest potential mechanisms that might contribute to lower cardiovascular mortality with habitual physical activity later in life.
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متن کاملPhysical Activity and Heart Rate Variability in Older Adults : The Cardiovascular Health Study
Dept of Epidemiology, Harvard School of Public Health, Boston, MA; Research Centre in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto, Porto, Portugal; Benjamin Leon Center for Geriatric Research and Education and Dept of Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL; Dept of Epidemiology, University of Washington, Seatt...
متن کاملPhysical Activity and Heart Rate Variability in Older Adults : The Cardiovascular Health Study Running title :
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عنوان ژورنال:
- Circulation
دوره 131 7 شماره
صفحات -
تاریخ انتشار 2014