Archivos Latinoamericanos de Nutrición (Sep 2006)
Ingesta de calcio y proteínas: relación con marcadores bioquímicos óseos en mujeres pre y posmenopáusicas de Comodoro Rivadavia (Argentina)
Abstract
Se estudió la relación de la ingesta de calcio y de proteínas con algunos marcadores de recambio óseo en 50 mujeres, 28 premenopáusicas (Pre) y 22 posmenopáusicas (Pos), de Comodoro Rivadavia (Argentina) con densidad mineral ósea (DMO) normal. Las ingestas de calcio (ICa) y de proteínas (IPr) se calcularon por encuesta de 7 días y frecuencia de consumo de alimentos. En orina de 24 h se determinaron: calcio (Ca), creatinina (Crea) y deoxipiridinolina (Dpir); en suero: fosfatasa alcalina ósea (BAPh). Los resultados (promedio ± DE, mínimo y máximo) fueron, para Pre y Pos, respectivamente: ICa (mg/d): 694 ± 411 (190 - 2.117); 918 ± 304 (471 - 1.740) (pHealthy premenopausal women (Pre n=28) and posmenopausal (Pos n=22), living in Comodoro Rivadavia (Argentina), with normal femoral neck and lumbar spine bone mineral density (BMD) were studied. Usual daily calcium intake (CaI) and protein intake (PrI) were calculated according to an special questionaire and the National Food Composition Tables. Fasting blood samples and 24 h urine were collected. Laboratory measurements were: in urine (U): calcium (Ca), creatinine (Crea) and deoxypiridinoline (Dpyr); in serum: Bone Alkaline Phosphatase (BAPh). The results presented the following media ± SD (minimum - maximum) in Pre and Pos, respectively: CaI (mg/d): 694 ± 411 (190 - 2,117); 918 ± 304 (471 - 1,740) (p<0.01); PrI (g/d): 64.6 ± 25.4 (33.5 - 136); 63.7 ± 17.6 (41.5 - 95.2); daily UCa (mg/d): 123 ± 85 (20 - 369); 114 ± 66 (17 - 252); Ca/crea (mg/mg): 0.124 ± 0.086 (0.014 - 0.372); 0.131 ± 0.077 (0.020 - 0.338); Dpyr/crea (nM/mM): 5.5 ± 1.5 (3.4 - 10.3); 7.1 ± 2.3 (3.9 - 14.5) (p<0.01); BAPh (UI/l): 58 ± 12 (28 - 94); 70 ± 20 (32 - 99) (p<0.01). CaI was lower than the Adequate Dietary calcium intake in 86 % and 82 % of the Pre and Pos women, respectively. There was no correlation between CaI, PrI and the biochemical indicators. Conclusions: in these healthy women, without bone mass loss and with wide range of CaI, although usually low, markers of bone turnover, would be a balance between the increase of bone formation and resorption.
