Table 2 Description of data recording used by each study.

From: Using heart rate variability to predict neurological outcomes in preterm infants: a scoping review

Study

Length of continuous HRV segment analysed

Infant state during recording

Device used for recording

Addison et al.46

>24 h

Long-term continuous recording

ECG

Doussard-Roosevelt et al.48a

10–15 min

Sleep (not specified)

ECG

Doussard-Roosevelt et al.47 a

10–15 min

Sleep (not specified)

ECG

Fairchild et al.45

>24 h

Long-term continuous recording

HeRO monitor (using ECG)

Gronlund et al.37

2 min

Quiet sleep

ECG

Hanna et al.38

20 min

During morning multisensory stimulation (done for a separate study)

NA

Huvanandana et al.39

Mean 156 min

NA

Umbilical or peripheral arterial catheter

Hadas et al.51

24 h

Long-term continuous recording

ECG

King et al.49

NA

NA

HeRO monitor (using ECG)

Lloyd et al.50

1 h

NA

NA

Prietsch et al.40

>24 h

Long-term continuous recording

Neonatal monitor measuring HR

Shiono et al.41

NA

NA

ECG

Sullivan et al.42

> 6 h

Long-term continuous recording

HeRO monitor (using ECG)

Tuzcu et al.43

~1 h

Supine quiet infants before surfactant administration/tracheal suctioning and then afterwards

ECG

van Ravenswaaij-Arts et al.44

3 min

Sleep (not specified)

ECG

  1. NA not specified in the report, ECG electrocardiogram, HR heart rate.
  2. aBoth studies were conducted in the same cohort of infants.