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Heart rate variability and 24-hour minimum heart rate
Robert L Burr1, Sandra A Motzer, Wan Chen
1Department of Biobehavioral Nursing and Health Systems, School of Nursing, University of Washington, Seattle 98195-7266, USA. bobburr@u.washington.edu
Biological Research for Nursing
|April 4, 2006
Summary
Twenty-four-hour minimum heart rate (HR) can serve as a simpler proxy for heart rate variability (HRV) in clinical research. This simpler measure correlates well with standard HRV indices, offering a potential alternative for data collection.
Area of Science:
- Cardiology
- Physiology
- Biomedical Engineering
Background:
- Heart rate variability (HRV) assessed via 24-hour electrocardiograph recordings is a key indicator of autonomic nervous system activity.
- Current HRV assessment methods, while noninvasive, incur significant costs and participant burden due to extensive data collection and processing.
- Exploring simpler alternatives to traditional HRV analysis is crucial for improving research efficiency and accessibility.
Purpose of the Study:
- To evaluate the relationship between 24-hour minimum heart rate (HR) and various time-domain HRV indices.
- To determine if 24-hour minimum HR can function as a simpler substitute or complementary measure for HRV in clinical research.
- To investigate the utility of minimum HR across diverse patient populations and research datasets.
Main Methods:
- Analysis of 24-hour electrocardiograph recordings from multiple datasets including healthy individuals, children, and patients with various conditions (irritable bowel syndrome, sudden cardiac arrest, heart failure).
- Calculation and comparison of standard time-domain HRV indices (Ln SDNN, Ln SDANN, Ln SDNNIDX, Ln RMSSD, Logit50).
- Correlation analysis between 24-hour minimum HR, average HR, and HRV indices, including repeated measurements.
Main Results:
- Strong correlations (r ≈ -0.80) were observed between 24-hour minimum HR and global HRV measures (Ln SDNN, Ln SDANN), exceeding correlations with average HR (r ≈ -0.50).
- Changes in minimum HR were also significantly correlated with changes in overall HRV (r ≈ -0.60) in longitudinal analyses.
- Modest discrepancies between minimum HR and HRV measures were noted in patients using cardiac medications like beta-blockers and anti-arrhythmics.
Conclusions:
- Twenty-four-hour minimum HR demonstrates a robust correlation with standard time-domain HRV measures.
- Minimum HR may serve as a practical proxy, surrogate, or auxiliary variable in specific clinical research settings.
- The utility of minimum HR as an HRV substitute is most promising in studies where participants are not on cardiac-influencing medications.