Interval and continuous exercise elicit equivalent postexercise hypotension in prehypertensive men, despite
Shawn P Lacombe1, Jack M Goodman, Carly M Spragg
1Graduate Deptartment of Exercise Sciences, University of Toronto, Toronto, ON M5S 2W6, Canada.
Summary
Older prehypertensive men experienced similar postexercise hypotension (PEH) after interval exercise (IE) and steady-state exercise (SS). Both exercise types similarly affected blood pressure, but IE caused greater changes in heart rate variability and baroreflex sensitivity.
Area of Science:
- Exercise Physiology
- Cardiovascular Health
- Gerontology
Background:
- Prehypertension in older adults poses cardiovascular risks.
- Understanding exercise's impact on blood pressure is crucial for this demographic.
- Different exercise modalities may yield varied physiological responses.
Purpose of the Study:
- To compare the effects of interval exercise (IE) and steady-state exercise (SS) on postexercise hypotension (PEH) in older prehypertensive males.
- To investigate cardiovascular responses, including blood pressure, heart rate, stroke volume, cardiac output, total peripheral resistance, baroreflex sensitivity (BRS), and heart rate variability (HRV), following different exercise modes.
- To determine if exercise mode influences the magnitude and duration of PEH in this population.
Main Methods:
- 13 older prehypertensive males completed equicaloric bouts of IE and SS exercise on separate days, alongside a control session.
- Cardiovascular measures were recorded for 30 minutes pre-exercise and 60 minutes post-exercise.
- PEH was assessed via systolic blood pressure (SBP) decrease, area under the SBP curve, and minimum SBP achieved.
Main Results:
- PEH was equivalent between IE and SS exercise, with no significant difference compared to the control.
- Stroke volume was significantly reduced, and heart rate significantly elevated post-exercise for both IE and SS.
- IE induced greater reductions in BRS and some HRV parameters compared to SS exercise.
Conclusions:
- Equicaloric IE and SS exercise elicit similar PEH in older prehypertensive adults.
- Despite similar PEH, IE leads to more pronounced alterations in autonomic cardiovascular regulation (BRS and HRV).
- Exercise mode may differentially impact autonomic function even when producing equivalent hypotension.
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