Figure 2.

Mean (±SEs) heart rate plotted every 30 seconds across the 5 minutes preceding and 5 minutes following SO, defined as the first epoch of four consecutive epochs of stable sleep (N2/N3) (SO-C), separately for girls (green rhombuses) and boys (blue circles). For illustrative purpose only, the sample was split in thirds according to the age distribution: young (<14 years; N = 34), mid (≥14 years, <17 years; N = 34), and older (≥17 years; N = 34) age categories. However, age was included as a continuous factor in the statistical models.