Table 4.
Summary of HRV acquisition methods.
| Acquisition category | Number of studies | Percentage |
|---|---|---|
| ECG/Holter-based acquisition | 17 | 70.8% |
| Wearable heart-rate monitor/chest strap | 6 | 25.0% |
| Optical PPG-based acquisition | 3 | 12.5% |
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