Key result
Breathing of linearly varying frequency induced phase and frequency locking of 0.1-Hz oscillations in both R-R intervals and photoplethysmogram, with differing durations and relative positions.
Observational (n=25)
The mechanisms of autonomic 0.1-Hz control of heart rate and blood pressure appear to be functionally independent based on differing phase and frequency locking responses to varying respiration rates.
No immediate clinical implications in healthy adults; leaves open relevance to disease states or interventions.
Functional interaction was studied between the subsystems that ensure autonomic control of the heart rate (HR) and blood pressure (BP) and give rise to 0.1-Hz oscillations in R-R intervals (RRI) and photoplethysmogram (PPG). Twenty-five recordings were obtained from 18- to 32-year-old healthy persons (six women and nineteen men). The RRI and PPG were recorded simultaneously while the respiration rate of a subject in the sitting position increased linearly from 0.05 Hz to 0.25 Hz within 25 min. Phase and frequency locking of 0.1-Hz oscillations by breathing proved to be possible in both RRI and PPG. The intervals of phase and frequency locking of oscillations by respiration differed in duration and relative position. These distinctions suggest that the mechanisms of autonomic 0.1-Hz control of HR and BP are functionally independent.
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Karavaev et al. (2013) conducted an observational in Healthy (n=25). Breathing of linearly varying frequency was evaluated on Phase and frequency locking of 0.1-Hz oscillations in RRI and PPG. Breathing of linearly varying frequency induced phase and frequency locking of 0.1-Hz oscillations in both R-R intervals and photoplethysmogram, with differing durations and relative positions.
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