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Heart rate variability and the exercise pressor reflex during dynamic handgrip exercise and postexercise arterial
Heidi A Kluess1, Robert H Wood
1Department of Kinesiology, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
The American Journal of the Medical Sciences
|March 16, 2005
Summary
The exercise pressor reflex involves changes in heart rate and blood pressure during exercise. Post-exercise occlusion reveals sustained sympathetic activity and parasympathetic withdrawal, indicating complex cardiovascular regulation.
Area of Science:
- Cardiovascular Physiology
- Autonomic Nervous System Regulation
- Exercise Physiology
Background:
- The exercise pressor reflex is a key cardiovascular control mechanism.
- This reflex may be impaired in conditions like heart failure and metabolic syndrome.
Purpose of the Study:
- To characterize the exercise pressor reflex.
- To observe heart rate variability and blood pressure responses during handgrip exercise and postexercise occlusion.
Main Methods:
- Collected continuous ECG, blood pressure, and respiratory data from 38 participants.
- Analyzed heart rate variability (mean R-R interval, SDNN) and blood pressure (MAP) during exercise and postexercise occlusion.
- Measured respiratory rate and normalized low-frequency power (LFnu) of heart rate variability.
Main Results:
- Exercise increased respiratory rate, LFnu, and mean arterial pressure (MAP).
- Mean R-R interval and SDNN decreased during exercise.
- MAP and mean R-R interval remained elevated post-exercise, while respiratory rate, SDNN, and LFnu showed partial recovery.
Conclusions:
- Sustained MAP elevation post-exercise suggests metaboreceptor-mediated sympathetic activity.
- Increased LFnu during exercise followed by recovery indicates parasympathetic withdrawal and subsequent vagal activation.
- The findings highlight dynamic autonomic adjustments during and after exercise, with persistent sympathetic drive.
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