Key result
Carotid baroreceptor stimulation via neck suction during active expiration increased respiratory sinus arrhythmia amplitude by 6.8 beats/min (P<0.001), indicating decreased baroreflex sensitivity during active inspiration.
Why the study?
Does the phase of the breathing cycle affect carotid baroreflex heart rate control and respiratory sinus arrhythmia in healthy subjects?
Population
15 healthy subjects
Comparison
Carotid baroreceptor stimulation by neck suction… vs Within-subject comparisons across different…
Design
Other
Authors
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Baroreflex sensitivity modulates with breathing phase in healthy subjects; extends RSA mechanisms but leaves open clinical translation.
Does the phase of the breathing cycle affect carotid baroreflex heart rate control and respiratory sinus arrhythmia in healthy subjects?
Mean Difference: 6.8
p-value: p=<0.001
The sensitivity of the carotid arterial baroreflex is decreased during active inspiration, suggesting this change in sensibility is a prerequisite for the rise of respiratory sinus arrhythmia.
A. Melcher (1980) studied Healthy (n=15). Neck suction (carotid baroreceptor stimulation) vs. Different phases of breathing (inspiration vs expiration) and breathing types (active vs assisted) was evaluated on Amplitude of respiratory sinus arrhythmia (RSA) (MD 6.8 beats/min, p=<0.001). Carotid baroreceptor stimulation via neck suction during active expiration increased respiratory sinus arrhythmia amplitude by 6.8 beats/min (P<0.001), indicating decreased baroreflex sensitivity during active inspiration.
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