Retention of estradiol negative feedback relationship to LH predicts ovulation in response to caloric restriction and weight loss in obese patients with polycystic ovary syndrome

Retention of estradiol negative feedback relationship to LH predicts ovulation in response to... The present study tests the hypothesis that specific endocrine, metabolic, and anthropometric features distinguish obese women with polycystic ovary syndrome (PCOS) who resume ovulation in response to calorie restriction and weight loss from those who do not. Fifteen obese (body mass index 39 ± 7 kg/m 2 ) hyperandrogenemic oligoovulatory patients undertook a very low calorie diet (VLCD), wherein each lost ≥10% of body weight over a mean of 6.25 mo. Body fat distribution was quantitated by magnetic resonance imaging. Hormones were measured in the morning at baseline, after 1 wk of VLCD, and after 10% weight loss. To monitor LH release, blood was sampled for 24 h at 10-min intervals before intervention and after 7 days of VLCD. Responders were defined a priori as individuals exhibiting two or more ovulatory cycles in the course of intervention, as corroborated by serum progesterone concentrations ≥18 nmol/l followed by vaginal bleeding. At baseline, responders had a higher sex hormone-binding globulin (SHBG) concentration but were otherwise indistinguishable from nonresponders. Body weight, the size of body fat depots, and plasma insulin levels declined to a similar extent in responders and nonresponders. Also, SHBG increased, and the free testosterone index decreased comparably. However, responders exhibited a significant decline of circulating estradiol concentrations (from 191 ± 82 to 158 ± 77 pmol/l, means ± SD, P = 0.037) and a concurrent increase in LH secretion (from 104 ± 42 to 140 ± 5 U·l -1 ·day -1 , P = 0.006) in response to 7 days of VLCD, whereas neither parameter changed significantly in nonresponders. We infer that evidence of retention of estradiol-dependent negative feedback on LH secretion may forecast follicle maturation and ovulation in obese patients with PCOS under dietary restriction. fertility; ovarian cycle; sex hormones; body fat distribution; gonadotropins Address for reprint requests and other correspondence: H. Pijl, Leiden Univ. Medical Center, Dept of General Internal Medicine, C1-R39, PO Box 9600, 2300 RC Leiden, The Netherlands (E-mail: h.pijl@lumc.nl ). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Endocrinology and Metabolism The American Physiological Society

Retention of estradiol negative feedback relationship to LH predicts ovulation in response to caloric restriction and weight loss in obese patients with polycystic ovary syndrome

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Publisher
The American Physiological Society
Copyright
Copyright © 2011 the American Physiological Society
ISSN
0193-1849
eISSN
1522-1555
D.O.I.
10.1152/ajpendo.00377.2003
Publisher site
See Article on Publisher Site

Abstract

The present study tests the hypothesis that specific endocrine, metabolic, and anthropometric features distinguish obese women with polycystic ovary syndrome (PCOS) who resume ovulation in response to calorie restriction and weight loss from those who do not. Fifteen obese (body mass index 39 ± 7 kg/m 2 ) hyperandrogenemic oligoovulatory patients undertook a very low calorie diet (VLCD), wherein each lost ≥10% of body weight over a mean of 6.25 mo. Body fat distribution was quantitated by magnetic resonance imaging. Hormones were measured in the morning at baseline, after 1 wk of VLCD, and after 10% weight loss. To monitor LH release, blood was sampled for 24 h at 10-min intervals before intervention and after 7 days of VLCD. Responders were defined a priori as individuals exhibiting two or more ovulatory cycles in the course of intervention, as corroborated by serum progesterone concentrations ≥18 nmol/l followed by vaginal bleeding. At baseline, responders had a higher sex hormone-binding globulin (SHBG) concentration but were otherwise indistinguishable from nonresponders. Body weight, the size of body fat depots, and plasma insulin levels declined to a similar extent in responders and nonresponders. Also, SHBG increased, and the free testosterone index decreased comparably. However, responders exhibited a significant decline of circulating estradiol concentrations (from 191 ± 82 to 158 ± 77 pmol/l, means ± SD, P = 0.037) and a concurrent increase in LH secretion (from 104 ± 42 to 140 ± 5 U·l -1 ·day -1 , P = 0.006) in response to 7 days of VLCD, whereas neither parameter changed significantly in nonresponders. We infer that evidence of retention of estradiol-dependent negative feedback on LH secretion may forecast follicle maturation and ovulation in obese patients with PCOS under dietary restriction. fertility; ovarian cycle; sex hormones; body fat distribution; gonadotropins Address for reprint requests and other correspondence: H. Pijl, Leiden Univ. Medical Center, Dept of General Internal Medicine, C1-R39, PO Box 9600, 2300 RC Leiden, The Netherlands (E-mail: h.pijl@lumc.nl ).

Journal

AJP - Endocrinology and MetabolismThe American Physiological Society

Published: Apr 1, 2004

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