Table 1.

Mean and Standard Deviation of Estradiol (E2), Progesterone (P4) and Log High Frequency Heart Rate Variability (HFlog) across the Menstrual Cycle Phases Investigated in Study One (N = 105 visits).

Menstrual Cycle Phase	E2	P4	HFlog
Midluteal	3.52 (0.73)	14.87 (8.81)	5.61 (1.06)
Perimenstrual	3.14 (0.86)	9.97 (5.12)	5.89 (1.05)
Mid-follicular	3.40 (1.22)	8.10 (3.95)	6.15 (1.06)
Ovulatory	3.85 (0.88)	7.13 (4.36)	6.01 (1.09)

Note. Estradiol is shown in pg/mL. Progesterone is shown in ng/dL.