Retenção de cálcio ósseo em meninos com baixa ingestão dietética de cálcio

Autor: Streit, Márcia Fernanda Sardinha de Araujo Rodrigues Taveira
Přispěvatelé: Bezerra, Flávia Fioruci, Koury, Josely Correa, Azeredo, Vilma Blondet de
Jazyk: portugalština
Rok vydání: 2012
Předmět:
Zdroj: Biblioteca Digital de Teses e Dissertações da UERJ
Universidade do Estado do Rio de Janeiro (UERJ)
instacron:UERJ
Popis: Submitted by Boris Flegr (boris@uerj.br) on 2021-01-05T16:43:39Z No. of bitstreams: 1 Dissert_Marcia Fernanda S A R T Streit.pdf: 509264 bytes, checksum: ea83c995b1f09c904853b95eb48fd36d (MD5) Made available in DSpace on 2021-01-05T16:43:39Z (GMT). No. of bitstreams: 1 Dissert_Marcia Fernanda S A R T Streit.pdf: 509264 bytes, checksum: ea83c995b1f09c904853b95eb48fd36d (MD5) Previous issue date: 2012-09-21 Bone mass expansion and daily calcium retention in bones vary by pubertal stage, being higher in pubertal stages III and IV. During this period, the daily calcium retention in bones can reach around 290 and 360mg/d in boys with calcium intake over 1000mg/d. Little is known about the daily calcium retention in boys with low calcium intake. The aim of the present study was to determine daily bone calcium retention over a period of six months in boys with low calcium intake. Twenty seven boys in pubertal stages I (8.5 ± 0.6 years, n=9), II (10.8 ± 0.7 years, n=9) and III (13.0 ± 1.0 years, n=9) participated in the study. Blood samples, bone measurements and body composition using dual energy X-ray absorptiometry (DXA) were performed at baseline and after 6 months. Food intake was estimated by three 24-h recalls throughout the study and analyzed by the software Nutrisurvey. Analysis of PTH-i, 25(OH)D and IGF-I in serum were assessed by chemiluminescent immunoassays. The daily calcium retention was calculated assuming that calcium represents 32.2% of the whole body BMC and considering the ratio between change in total body calcium content and days elapsed between measurements. Calcium intake was similar between groups (684±265mg/d, 618±406mg/d e 597±332mg/d in stages I, II e III, respectively) and corresponded to about 55% of the recommended intake. Z-scores for whole body and total proximal femur BMD were greater than -2.0 at the beginning of the study and after six months. The daily calcium retention in bones was lower (P 0.49; P0,49; P
Databáze: OpenAIRE
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