Table S1. Overview of heart rate variability parameters.
| Frequency domain HRV measures | Unit | Description | |
|---|---|---|---|
| VLF | Power in very low frequency range | ms2 | Physiological correlate unclear; may reflect vasomotor function, renin angiotensin system, and/or parasympathetic influence |
| LF | Power in low frequency range | ms2 | Reflects sympathetic or sympathetic parasympathetic influence. |
| LF/HF | Ratio of low to high frequency power | – | Reflects sympathovagal balance. |
| TP | Total power | ms2 | Estimate of overall HRV. |
| Time domain HRV measures | Unit | Description | |
| ASDNN | Average of all 5-minute SDNN over 24 | ms | Estimate of short-term components of HRV (i.e., changes in heart rate due to cycles < 5 minutes). |
References: [10] Heart Rate Variability. Standards of measurement, physiological interpretation and clinical use, Task Force of European Society of Cardiology and the North American society of pacing and electrophysiology. Eur Heart J. 1996; 17: 354-381. Kleiger RE, Stein PK, Bigger JT. Heart Rate Variability: Measurement and Clinical Utility. Ann Noninvasive Electrocariol. 2005; 10: 88-101.