Table 1.
Criteria of the automatic state classification based on the original Nijhuis criteria.
| State/fHRP | 1F/fHRP1 quiet sleep | 2F/fHRP2 active sleep | 4F/fHRP4 active awake |
|---|---|---|---|
| Original criteria | • Quiescence which can be regularly interrupted by brief body movements (startles) • Stable heart rate, small oscillation • Isolated accelerations occur strictly related to movement |
• Frequent gross body movement Heart rate with wider bandwidth than 1F • Frequent accelerations during movement |
• Vigorous activity with many trunk rotations • Unstable heart rate • Large and long lasting accelerations fused into sustained tachycardia |
| Criteria for automatic state detection | |||
| Baseline | <160 bpm | <160 bpm | >160 bpm possible |
| Oscillation bandwith | <±7.5 bpm | ±7.5–±15 bpm | >±15 bpm |
| Accelerations | No | >15 bpm/>15 s | >30 bpm/>30 s |
| Movement | No | Yes | Yes |