Circadian Patterns of Heart Rate Turbulence, Heart Rate Variability and Their Relationship
1Department of Cardiology, Taipei City Hospital-Heping Branch, No. 33, Sec. 2, Zhonghua Rd., Taipei City 100, Taiwan. Email: anigi426@ms24.hinet.net ; dae28@tpech.gov.tw.
Cardiology Research
|March 30, 2017
Summary
Heart rate turbulence (HRT) slope shows significant daily changes, reflecting autonomic activity. The relationship between heart rate variability (HRV) and HRT remains consistent throughout the day.
Area of Science:
- Cardiology
- Autonomic Nervous System Research
- Physiology
Background:
- Heart rate variability (HRV) assesses cardiac autonomic activity.
- Heart rate turbulence (HRT) is a newer method for autonomic dysfunction.
- Autonomic tone varies throughout the day.
Purpose of the Study:
- To investigate how circadian changes in autonomic tone affect HRT and HRV.
- To determine the relationship between HRT and HRV across different times of the day.
Main Methods:
- Collected 24-hour Holter recordings from 35 healthy subjects.
- Calculated HRV and HRT parameters: turbulence onset (TO) and turbulence slope (TS).
- Analyzed 24-hour circadian patterns and correlations between HRV and HRT parameters.
Main Results:
- Turbulence slope (TS) and HRV parameters exhibited significant diurnal oscillations; turbulence onset (TO) showed less variation.
- TS and high-frequency power (HF) demonstrated similar daily oscillation patterns.
- TS positively correlated with HF and low-frequency power (LF) but inversely with LF/HF ratio.
Conclusions:
- Circadian changes in TS are more pronounced than in TO, indicating greater autonomic relevance.
- The relationships between HRV and HRT are maintained irrespective of the time of day.
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