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Human Reproduction, Vol. 10, No. 11, pp. 2849-2853, 1995
© 1995 European Society of Human Reproduction and Embryology

research-article

Diminished luteinizing hormone biopotency in breastfeeding women

M. Serón-Ferre1,4, M. Vergara1, V. García-Huidobro1, I. Huhtaniemi2 and S. Díaz3

1Unidad de Reproduccion y Desarrollo, Facultad de Ciencias Biologicas, Pontificia Universidad Católica de Chile, Santiago, Chile 2Department of Physiology, University of Turku Turku, Finland 3Consultorio de Planificación Familiar, Instituto Chileno de Medicina Reproductiva Santiago, Chile

Correspondence: 4To whom correspondence should be addressed

The effect of nursing on plasma luteinizing hormone bioactivity (B-LH) and immunoactivity (I-LH) was assessed at 4 and 6 months post partum in fully nursing women who experienced their first bleeding between months 5 and 6 post partum (n = 6, short amenorrhoea) or after the month 6 (n = 10, long amenorrhoea). Controls were 10 nonnursing fertile women. Blood samples were drawn twice weekly at month 4 post partum and at month 6 post partum. In the nursing women who were cycling at month 6 and in non-nursing women samples were drawn during the follicular phase. I-LH was measured by a time resolved immunofluorometric assay (DELFIA) and B-LH by the mouse Leydig cell assay. Nursing decreased B-LH more than I-LH resulting in a relationship between B-LH and I-LH different to that of non-nursing women (B-LH=2.84xI-LH-0.16and B-LH=4.27xI-LH$3.11 respectively, P < 0.05, by likelihood test). Plasma B-LH or I-LH were similar in nursing women with short or long amenorrhoea. In conclusion, nursing alters the quality of circulating LH, however, the decreased LH steroidogenic potency does not play a role in determining the duration of lactational amenorrhoea.

Key words: breastfeeding/lactation/LH bioactivity/nursing/women


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