Haga Megumi, Sakata Takashi
Department of Health and Nutrition, Shokei Gakuin University, Natori, Miyagi, Japan.
J Nutr Sci Vitaminol (Tokyo). 2010;56(5):305-10. doi: 10.3177/jnsv.56.305.
We measured concentrations of sodium and creatinine in previously validated overnight urine and 24-h urine of 79 healthy infants of 3 to 5 y of age in two cities in Miyagi Prefecture, Japan. Thereafter, we estimated daily salt intake from daily urinary sodium excretion and daily urinary volume. Corrections for potential sweat loss of sodium chloride were conducted based on urinary volume and urinary creatinine concentration. We also measured urinary volume and urinary sodium concentration in infants who failed to provide complete urine samples. The estimated salt intake did not differ between boys and girls, but varied between the two cities. The estimated salt intake per unit of body weight differed neither between genders nor between cities. The grand means for estimated salt intake and that per unit of body weight were 5.5 g/d (SD 1.8) and 0.32 g/kg/d (SD 0.10), which supported previous results both in Japan and abroad. It was also possible to roughly estimate salt intake from sodium concentration in overnight urine or incomplete 24-h urine, and published urine volume.
我们在日本宫城县两个城市中，对79名3至5岁健康婴儿的过夜尿和24小时尿中钠和肌酐的浓度进行了测量，这些尿液样本此前已经过验证。此后，我们根据每日尿钠排泄量和尿量估算每日盐摄入量。基于尿量和尿肌酐浓度对氯化钠潜在汗液流失进行了校正。我们还对未能提供完整尿液样本的婴儿测量了尿量和尿钠浓度。估算的盐摄入量在男孩和女孩之间没有差异，但在两个城市之间有所不同。单位体重的估算盐摄入量在性别之间和城市之间均无差异。估算盐摄入量及其单位体重的总体均值分别为5.5克/天（标准差1.8）和0.32克/千克/天（标准差0.10），这与日本国内外之前的研究结果相符。根据过夜尿或不完整的24小时尿中的钠浓度以及已公布的尿量，也有可能大致估算盐摄入量。
