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(a) Frequency of uterine contractions detected in vivo in a cohort of menstruating women during the menstrual cycle detected with ultrasound (US) and Intrauterine Pressure detection (IUP); (b) Timings detected were menstrual cycle (mens), early follicular (EF), late follicular (LF), peri-ovulatory (PO), early luteal (EL), and late luteal (LL) phase of normal menstrual cycles. Adapted with permission from Ref. [62]. Copyright 2000, European Society of Human Reproduction and Embryology.
