Exercise intensity and blood pressure during sleep.
Exercise, of appropriate intensity and duration, could help maintain normotension if post-exercise hypotension persists over subsequent everyday activities. Therefore, we monitored ambulatory blood pressure (BP) for 24 h following four separate exercise bouts which differed in intensity, duration and total work completed. At 08:00 h, six normotensive males completed a no exercise control and, in two further trials, 30 min of cycling at 70 % V O (2 peak) and 40 % V O (2 peak). A fourth trial involved cycling at 40 % V O (2 peak) for a time which equated total work with that in the most intense exercise trial. Between 20 min and 24 h after exercise, ambulatory BP, heart rate (HR) and wrist-activity were compared between trials using general linear models. Participants slept normally at night. Post-exercise changes in BP and HR were not affected by exercise intensity or total work completed from 20 min after exercise until nocturnal sleep-onset (p > 0.21). During sleep, mean arterial BP was lower following exercise at 70 % V O (2 peak) compared to the other trials (p = 0.03), including the 40 % V O (2 peak) trial equated for total work (90 % CI for difference = - 22.1 to - 0.1). We conclude that daytime exercise can elicit a physiologically meaningful lower BP during sleep and exercise intensity is the most important factor in this phenomenon.
Jones
H
H
Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK. h.jones1@ljmu.ac.uk
George
K
K
Edwards
B
B
Atkinson
G
G
D000328:Adult; D001642:Bicycling / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology*; D018660:Blood Pressure Monitoring, Ambulatory; D003971:Diastole; D016552:Ergometry; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D017079:Exercise Tolerance / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D012890:Sleep / Q000502:physiology*; D013599:Systole; D013997:Time Factors