Figure 2. LF/HF ratio (ln(LF/HR)_RRI; mean ± SD) throughout gestation: Black bars depict the values of the variables in rest, the grey bars show the post stress (deep breathing) condition (RRI = R-R interval; LF = low frequency; HF = high frequency; ln = natural logarithmic transformation).

*denotes a significant difference (p<.05) between rest and post DB in case of a significant univariate interaction effect.