HRV metrics are computed byDocumentation Index
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_compute_hrv_metrics(peaks, fps) from rPPG inter-beat intervals.
| Metric | Field | Description |
|---|---|---|
| Time-domain | hrv_sdnn | Standard deviation of NN intervals (ms) |
| Time-domain | hrv_rmssd | Root mean square of successive differences (ms) |
| Frequency-domain | hrv_lf_hf_ratio | Low-frequency / high-frequency ratio |
| Nonlinear | hrv_sd1 | Poincaré plot short-term variability (ms) |
| Nonlinear | hrv_sd2 | Poincaré plot long-term variability (ms) |
min_hrv_duration). Lower SDNN and elevated LF/HF correlate with sympathetic dominance.