Human Reproduction, Vol. 16, No. 12, 2501-2507,
December 2001
© 2001 European Society of Human Reproduction and Embryology
Characteristics of human ovulation in natural cycles correlated with age and achievement of pregnancy
1 Fukuda Ladies Clinic, 30–9 Kariya, Ako, Hyogo 678-0239, Japan and 2 Laboratory of Reproductive Biology, Juliane Marie Center for Children, Women and Reproduction, Rigshospitalet, Section 5712, University Hospital of Copenhagen, Blegdamsvej 9, DK-2100, Copenhagen, Denmark
BACKGROUND: The aim of this study was to evaluate whether characteristics of human ovulation correlate with age and pregnancy potential. METHODS: Two groups of women with regular menstrual cycles were included (i.e. one fertile and one infertile group), which were divided into four age groups (
29, 30–34, 35–39, 
40 years). Monitoring included observations of follicular phase length, whether ovulations occurred from the left or right ovary, the pattern of ovulations in succeeding natural cycles and, in a subset of women, early follicular phase FSH concentrations. RESULTS: Ovulation moving from one ovary to the other in two consecutive cycles (i.e. contralateral ovulation) was inversely correlated with age, showing a ratio of contralateral ovulation per contra plus ipsilateral ovulations (C/C+I) of 62% in women <29 years, gradually decreasing to 42% in women >40 years. The ratio of right-sided ovulation per right plus left-sided ovulations (R/R+L) was unrelated to age and remained almost constant at a level of ~55%. The follicular phase length was inversely correlated with age, being 16.2 ± 2.9, 15.4 ± 2.9, 14.8 ± 2.8 and 13.7 ± 1.3 days in women < 29, 30–34, 35–39 and >40 years of age respectively. The follicular phase length was similar when comparing ovulations occurring from the right and left ovary, but comparing two successive cycles, the length of the follicular phase of the second cycle, showing contralateral ovulation, was shorter than ipsilateral ovulation with two consecutive ovulations in the same ovary. The pregnancy rate of the four groups decreased with age, being 14, 12, 5 and 3% respectively. The C/C+I ratio correlates with pregnancy rate and follicular phase length, and inversely correlates with basal FSH, whereas R/R+L is unrelated to age and pregnancy rate. CONCLUSIONS: Human ovulation shows characteristics related to age. The interaction between the two ovaries seems to be most pronounced in the younger years, where ovulations jump from one ovary to the other more frequently than later on in life. The C/C+I ratio shows a clear correlation with age and pregnancy rate.
Key words: age/contralateral versus ipsilateral ovulations/follicular phase length/pregnancy/right-sided versus left-sided ovulations
3 To whom correspondence should be addressed. E mail: fukuda8767{at}gem.bekkoame.ne.jp
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  C. Chapron, N. Chopin, B. Borghese, H. Foulot, B. Dousset, M. C. Vacher-Lavenu, M. Vieira, W. Hasan, and A. Bricou Deeply infiltrating endometriosis: pathogenetic implications of the anatomical distribution Hum. Reprod., July 1, 2006; 21(7): 1839 - 1845. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T. Piltonen, R. Koivunen, A. Ruokonen, and J. S. Tapanainen Ovarian Age-Related Responsiveness to Human Chorionic Gonadotropin J. Clin. Endocrinol. Metab., July 1, 2003; 88(7): 3327 - 3332. [Abstract] [Full Text] [PDF]
|
|