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Heart rate variability (HRV) at each of the five episodes of the face-to-face still-face paradigm [HRV is represented by mean respiratory sinus arrhythmia (RSA) values].
| Mean RSA | Mean (SD) |
|---|---|
| Baseline | 3.33 (0.70) |
| First still-face | 2.91 (1.03) |
| First reunion | 3.40 (0.80) |
| Second still-face | 3.02 (1.16) |
| Second reunion | 3.11 (0.85) |
| First reactivity | 0.47 (0.73) |
| Second reactivity | 0.25 (0.82) |
