Table 4.

Phase synchronization indices of the high-frequency (HF) components (mean ± SD) of participants, and statistical results for group differences in response to the stress manipulation. CO: women without gestation during the last three years; UP: women with uncomplicated pregnancies; PE: women with a history of preeclampsia; γ: synchronization index; SBP: systolic blood pressure, DBP: diastolic blood pressure; RRI: R–R intervals; RESP: respiration.

	Baseline	Anticipation	Task	Post-Task	F-Statistics
γSBPxRRI,HF (−)
CO	0.60 ± 0.19	0.50 ± 0.20	0.33 ± 0.17	0.50 ± 0.25	period	F(2,240) = 0.6, p = 0.550
UP	0.63 ± 0.22	0.52 ± 0.21	0.33 ± 0.15	0.52 ± 0.22	period x group	F(4,240) = 1.0, p = 0.408
PE	0.66 ± 0.17	0.53 ± 0.19	0.29 ± 0.13	0.54 ± 0.20
γDBPxRRI,HF (−)
CO	0.40 ± 0.26	0.37 ± 0.20	0.29 ± 0.12	0.36 ± 0.23	period	F(2,240) = 8.4, p < 0.001
UP	0.36 ± 0.22	0.30 ± 0.20	0.29 ± 0.15	0.33 ± 0.17	period x group	F(4,240) = 1.3, p = 0.258
PE	0.37 ± 0.21	0.31 ± 0.21	0.22 ± 0.13	0.31 ± 0.20
γRESPxRRI,HF (−)
CO	0.71 ± 0.19	0.62 ± 0.18	0.39 ± 0.19	0.62 ± 0.22	period	F(2,240) = 0.5, p = 0.591
UP	0.69 ± 0.22	0.57 ± 0.20	0.33 ± 0.18	0.55 ± 0.26	period x group	F(4,240) = 0.5, p = 0.736
PE	0.70 ± 0.23	0.57 ± 0.25	0.32 ± 0.18	0.58 ± 0.22
γRESPxSBP,HF (−)
CO	0.67 ± 0.22	0.55 ± 0.20	0.30 ± 0.18	0.58 ± 0.24	period	F(1.9,223.4) = 1.1, p = 0.342
UP	0.70 ± 0.22	0.58 ± 0.19	0.27 ± 0.16	0.53 ± 0.26	period x group	F(3.7,223.4) = 2.2, p = 0.080
PE	0.68 ± 0.23	0.54 ± 0.24	0.22 ± 0.15	0.57 ± 0.25
γRESPxDBP,HF (-)
CO	0.33 ± 0.25	0.26 ± 0.18	0.18 ± 0.13	0.24 ± 0.19	period	F(2,240) = 3.0, p = 0.053
UP	0.33 ± 0.20	0.24 ± 0.15	0.17 ± 0.12	0.24 ± 0.16	period x group	F(4,240) = 2.2, p = 0.065
PE	0.28 ± 0.18	0.20 ± 0.19	0.11 ± 0.09	0.24 ± 0.19