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          J Clin Endocrinol Metab. 2002 Dec;87(12):5746-50.
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Is the short follicular phase in older women secondary to advanced or accelerated dominant follicle development?

Klein NA, Harper AJ, Houmard BS, Sluss PM, Soules MR.

Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington 98105, USA. nklein@u.washington.edu

This study sought to determine whether the shortened follicular phase in ovulatory older women is secondary to advanced (i.e. earlier) or accelerated (i.e. more rapid) folliculogenesis. Normal ovulatory women, aged 40-45 yr (n = 15) and 20-25 yr (n = 13), underwent daily venipuncture and transvaginal ultrasonography throughout the follicular phase of a spontaneous menstrual cycle (control cycle) and after pituitary down-regulation with a GnRH agonist (study cycle). As expected, the older subjects in the control cycles demonstrated an elevated d 3 FSH and a shortened follicular phase compared with the younger subjects. After release from hypothalamic-pituitary-ovarian axis suppression, the early follicular phase FSH peak occurred earlier (6.8 vs. 9.8 d; P < 0.01) and was of a greater magnitude (12.1 vs. 6.5 mIU/ml; P < 0.01) in the older subjects. The time from release of suppression until the subsequent LH surge was also shorter (17.5 vs. 20.8 d; P < 0.01) in the older group. However, the time from FSH peak to LH surge was similar in the older and younger groups (10.7 vs. 11.0 d; P = 0.74). Compared with younger women, older subjects had normal follicular phase levels of estradiol and inhibin A and lower levels of inhibin B in both control and study cycles. We conclude that the shortened follicular phase observed in older ovulatory women is due to earlier dominant follicle selection, independent of hormonal influences from the preceding luteal phase.
 
 
 
           Derzeit aus Zeitmangel nur die Übersetzung des rotmarkierten Textes:
 
          Ist eine kurze Follikelphase ( = 1. Zyklushälfte) der Nebeneffekt eines vorzeitigen oder beschleunigten   
          Wachstums des Leitfollikels?

          Wie erwartet zeigte sich bei den älteren Testpersonen ein erhöhter FSH-Wert an Tag 3 sowie eine verkürzte
          Follikelphase.

          Wir schliessen daraus, dass eine verkürzte Follikelphase, welche bei älteren ovulierenden Frauen 
          beobachet wird, an einer früheren Selektion des Leitfollikels liegt - unabhängig von hormonellen Einflüssen 
          der vorangegangenen Lutealphase