April 1, 1997Circulation
Origin of Respiratory Sinus Arrhythmia in Conscious Humans
Key result
Counteracting respiration-induced cycles of carotid blood pressure using neck suction significantly decreased respiratory sinus arrhythmia from 2136 to 1372 ms2 (P<0.01).
Why the study?
Does sinusoidal neck suction influence respiratory sinus arrhythmia in healthy humans?
Population
Healthy conscious humans
Comparison
Sinusoidal neck suction during controlled… vs Suction of a non-baroreceptor area or baseline
Design
Other
Authors
Discussion
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Implication
Neck suction blunts RSA in healthy humans; supports baroreflex contribution but leaves open relevance to disease or therapy.
Key Points
- The study aims to determine whether respiratory sinus arrhythmia (RSA) arises from central nervous system activities or peripheral baroreceptor responses.
- Controlled breathing experiments in healthy subjects (N=11, N=13) to assess RSA effects via neck suction.
- Utilized spectral analysis of RR intervals to evaluate changes in RSA during sinusoidal neck suction and controlled apnea.
- Assessed the impact of neck suction at 12 cycles/min to differentiate effects of central and peripheral influences on RSA.
- Apnea reduced RSA from 2136 +/- 682 to 1372 +/- 561 ms2, P < .01.
- Neck suction at respiratory frequency restored RSA, indicating baroreceptor involvement.
- Stimulation of a non-baroreceptor area (thigh) showed minimal effect on RSA, reinforcing the role of arterial baroreceptors.
Structured PICO
Does sinusoidal neck suction influence respiratory sinus arrhythmia in healthy humans?
P
Population
Healthy conscious humans
I
Intervention
Sinusoidal neck suction during controlled breathing
C
Comparator
Suction of a non-baroreceptor area (the thigh) or baseline
O
Outcome
Respiratory sinus arrhythmia (measured via spectral analysis of RR interval)surrogate
Main Result
Absolute Event Rate: 1372% vs 2136%
p-value: p=<.01
Respiratory sinus arrhythmia in conscious humans is significantly influenced by arterial baroreceptors responding to respiratory changes in blood pressure.
Cite This Study
Piepoli et al. (1997) studied Healthy (n=13). Sinusoidal neck suction vs. Suction of a non-baroreceptor area (the thigh) was evaluated on Respiratory sinus arrhythmia (spectral analysis of RR interval) (p=<.01). Counteracting respiration-induced cycles of carotid blood pressure using neck suction significantly decreased respiratory sinus arrhythmia from 2136 to 1372 ms2 (P<0.01).