Document Detail

Effect of sex steroids on beta-endorphin levels at rest and during submaximal treadmill exercise in anovulatory and ovulatory runners.
MedLine Citation:
PMID:  10360915     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To examine the interaction between circulating beta-endorphin levels and sex steroids during sustained submaximal exercise in runners who are either anovulatory and oligomenorrheic (AO) or ovulatory and eumenorrheic (EO). DESIGN: Controlled clinical study. SETTING: General clinical research center at an academic medical center. PATIENT(S): Three AO and four EO runners. INTERVENTION(S): The athletes underwent 60 minutes of submaximal treadmill exercise on three separate occasions. Anovulatory and oligomenorrheic runners underwent exercise at baseline and after physiologic estrogen and combined estrogen and progesterone replacement. Ovulatory and eumenorrheic runners underwent exercise in the follicular and luteal phases and after GnRH agonist desensitization. MAIN OUTCOME MEASURE(S): Serum cortisol, beta-endorphin, progesterone, estrogen, and gonadotropin levels at rest and during exercise. RESULT(S): Serum levels of E2 increased in response to exercise in both EO and AO runners during sex steroid replacement. Baseline peripheral beta-endorphin and cortisol levels were not different between the EO and AO groups. A significant increase in beta-endorphin levels in response to exercise occurred only in the EO group after GnRH agonist desensitization. CONCLUSION(S): Alterations in menstrual cyclicity and ovulation in conditioned runners probably are not due to an increase in opioid tone. The hypothalamic-gonadotropic axis appears to be intact in AO runners, as measured by the gonadotropic response to exogenous exposure to estrogen and progesterone. Sex steroid administration had no effect on basal beta-endorphin levels, but this probably was not due to preexisting increased opioid tone.
W R Meyer; D Muoio; T C Hackney
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Fertility and sterility     Volume:  71     ISSN:  0015-0282     ISO Abbreviation:  Fertil. Steril.     Publication Date:  1999 Jun 
Date Detail:
Created Date:  1999-06-17     Completed Date:  1999-06-17     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0372772     Medline TA:  Fertil Steril     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1085-91     Citation Subset:  IM    
Department of Obstetrics and Gynecology, School of Medicine, University of North Carolina, Chapel Hill 27599, USA.
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MeSH Terms
Amenorrhea / etiology
Anovulation / blood,  etiology*
Estradiol / blood
Estrogens / administration & dosage,  pharmacology
Exercise / physiology*
Follicle Stimulating Hormone / blood
Gonadal Steroid Hormones / pharmacology*
Hydrocortisone / blood
Leuprolide / pharmacology
Menstrual Cycle
Progesterone / administration & dosage,  blood,  pharmacology
beta-Endorphin / blood*
Grant Support
Reg. No./Substance:
0/Estrogens; 0/Gonadal Steroid Hormones; 50-23-7/Hydrocortisone; 50-28-2/Estradiol; 53714-56-0/Leuprolide; 57-83-0/Progesterone; 60617-12-1/beta-Endorphin; 9002-68-0/Follicle Stimulating Hormone

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