Figure 1.
Overview of the Still-Face Paradigm.
Table 1.
Percentages of breaths too short to allow extraction of two inter-beat intervals for peak-valley RSA calculation in infants.
Figure 2.
RSA (uncorrected and corrected for respiration), respiratory parameters, physical activity and heart rate across the two Still-Face Test challenges (n = 16).
Table 2.
Means ± standard deviations of respiration-uncorrected and respiration-corrected RSA indices, respiration measures, and HR for Still-Face Test episodes.
Table 3.
Overall ANOVA time effects (df = 4,66 or 2,44) for changes in physiological parameters across Still-Face Tests and paired t-tests (df = 15 or 22) testing changes from Play to Still-Face episodes 1 and 2.
Table 4.
Within-individual association of infant RSA with respiratory parameters TTOT entered in Step 1 and VT entered in Step 2, or in reverse order, calculated across all episodes of the Still-Face Paradigm.
Figure 3.
Individual trajectories of RSA uncorrected and corrected for respiration (both tidal volume and respiration rate) across the three episodes of the first Still-Face Test (n = 23).
Table 5.
ANOVA time effects (df = 4,60 or 2,44) and paired t-tests (df = 15 or 22) measuring reduction in additional respiration-uncorrected and corrected RSA indices during Still-Face Test 1 and 2.
Table 6.
RSA, respiration, and heart rate across Still-Face Test episodes controlled for physical activity: Linear mixed model overall F tests (df = 2 or 4, 50.0 to 67.7), time-varying covariate activity effect F-tests (df = 1, 25.7 to 77.8) and t-tests (df = 52.4 to 77.7) testing changes from Play to Still-Face episode 1 and 2.