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Parasympathetic cardiac control in mild hypertension
1Psychology Section, Murdoch University, Western Australia.
Journal of Hypertension
|April 1, 1990
Summary
Mildly hypertensive individuals exhibit reduced respiratory sinus arrhythmia (RSA) amplitude, indicating potential parasympathetic nervous system dysfunction. Breathing patterns may influence cardiac control in hypertension.
Area of Science:
- Cardiology
- Physiology
- Hypertension Research
Background:
- Respiratory sinus arrhythmia (RSA) reflects parasympathetic cardiac modulation.
- Mild hypertension is associated with altered autonomic nervous system function.
Purpose of the Study:
- To investigate RSA amplitude differences between mildly hypertensive and normotensive individuals.
- To explore the impact of breathing patterns on cardiac autonomic control in hypertension.
Main Methods:
- Measured RSA amplitude during quiet breathing and CO2 rebreathing.
- Compared RSA in 32 hypertensive and 28 normotensive subjects.
- Analyzed heart rate variability and breathing rate.
Main Results:
- Hypertensive subjects showed smaller RSA amplitude, especially with higher diastolic blood pressure.
- Hypertensive subjects had faster breathing rates and shorter R-R intervals.
- Adjusting for breathing rate, RSA amplitude was similar, but R-R intervals remained shorter in hypertensives.
Conclusions:
- Reduced RSA in mild hypertension may stem from altered breathing patterns.
- Breathing style could contribute to diminished parasympathetic cardiac control in hypertension.