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Titolo:
INTESTINAL CALCIUM-ABSORPTION OF WOMEN DURING LACTATION AND AFTER WEANING
Autore:
KALKWARF HJ; SPECKER BL; HEUBI JE; VIEIRA NE; YERGEY AL;
Indirizzi:
CHILDRENS HOSP,MED CTR,DIV NEONATOL,ML-0541,3333 BURNET AVE CINCINNATI OH 45229 NICHHD,NIH BETHESDA MD 20892
Titolo Testata:
The American journal of clinical nutrition
fascicolo: 4, volume: 63, anno: 1996,
pagine: 526 - 531
SICI:
0002-9165(1996)63:4<526:ICOWDL>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
METABOLISM; PREGNANCY;
Keywords:
INTESTINAL CALCIUM ABSORPTION; LACTATION; WEANING; STABLE ISOTOPES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
H.J. Kalkwarf et al., "INTESTINAL CALCIUM-ABSORPTION OF WOMEN DURING LACTATION AND AFTER WEANING", The American journal of clinical nutrition, 63(4), 1996, pp. 526-531

Abstract

We investigated whether intestinal calcium absorption and serum 1,25-dihydroxycholecalciferol (calcitriol) concentrations are higher in women during lactation and after weaning to compensate for calcium lost in breast milk. Measurements were obtained at 4.6 mo postpartum in 24 lactating women and 24 nonlactating women, at 9.6 mo postpartum in 24 lactating women (2.6 mo after complete weaning) and 24 nonlactating women. One-half of the women in each group were randomly assigned to receive 1 g supplemental Ca/d as calcium carbonate. Fractional calcium absorption was measured by using stable isotopic tracers Ca-42 and Ca-44. Fractional absorption was 0.32 +/- 0.02 (+/- SEM) in both lactating and nonlactating women, but was higher in lactating women after weaning(0.37 +/- 0.02) compared with nonlactating postpartum control subjects (0.31 +/- 0.02). These effects were independent of calcium intake. Changes in serum calcitriol paralleled changes in fractional absorption. There were no differences in calcitriol concentrations between lactating and nonlactating women, but calcitriol was greater in women afterweaning compared with postpartum control subjects. Lactating women who had resumed menses had higher fractional absorption and serum calcitriol than did lactating women who had not. Serum calcium and phosphorus concentrations were greater in lactating compared with nonlactating women; there were no differences between groups after weaning. We conclude that lactation stimulates increases in fractional calcium absorption and serum calcitriol, but the responses are only apparent after weaning or the resumption of menses.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 21:39:40