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- W2037755006 abstract "Blood pressure (BP) fluctuates over a 24-hour period, but it is unclear to what extent this variation is governed completely by changes in physical activity. Our aim was to use a BP “reactivity index” to investigate whether the BP response to a given level of physical activity changes during a normal sleep-wake cycle. Hypertensive patients (n=440) underwent simultaneous 24-hour ambulatory BP, heart rate (HR), and activity monitoring. BP and HR were measured every 20 minutes. Actigraphy data were averaged over the 15 minutes that preceded a BP measurement. Individual BP and HR reactivity indices were calculated using least-squares regression for twelve 2-hour periods. These indices were then analyzed for time-of-day differences using a general linear model. Systolic BP and HR were generally more reactive to physical activity than diastolic BP. The highest reactivity of systolic BP (mean±SE=4±1 mm Hg per logged unit change in activity) was observed between 8:00 am and 10:00 am ( P =0.014). Between 10:00 am and 12:00 pm , BP reactivity then decreased ( P =0.048) and showed a secondary rise in the early afternoon. These 24-hour changes in BP reactivity did not differ significantly between groups formed on the basis of early and late wake times ( P =0.485), medication use, age, and sex ( P >0.350). In conclusion, under conditions of normal living, the reactivity of BP and HR to a given unit change in activity is highest in the morning and shows a secondary rise in the afternoon." @default.
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- W2037755006 date "2006-04-01" @default.
- W2037755006 modified "2023-09-23" @default.
- W2037755006 title "Reactivity of Ambulatory Blood Pressure to Physical Activity Varies With Time of Day" @default.
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- W2037755006 doi "https://doi.org/10.1161/01.hyp.0000206421.09642.b5" @default.
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