摘要
一、钙在骨代谢的重要性（一）骨的成分：骨由胶原及其他蛋白质与骨细胞构成骨小梁和骨皮质，骨小梁和骨皮质形成了骨的支架，确定了骨的形状，大小和结构。骨盐沉着于上述骨质结构，增加其硬度。骨盐中最主要的是钙、磷、镁，还有少量的微量元素。体内总钙量为１０００ｇ...
Calcium is an important component of bone, totals to 1 000g in the body and distributes in bone up to 99%. The humoral substances influencing the metabolism of calcium include sex hormones, parathyroid hormone, calcitonin, thyroid hormones, vitamin D and cytokines. The organs and tissues influencing the metabolism of calcium include intestine, kidney, bone, skin and those organs and tissues secreting the aforementioned humoral substances. The dietetic calcium in Chinese is comparatively low, being 480 mg/d according to our measurement. The intestinal net absorption rate of calcium, measured in 124 healthy adult Chinese in serial cohorts in recent 20 years was gradually increased as time going on, and is 30 0% in average. The gradual increase of intestinal net absorption rate of calcium in past twenty years may be related to the rise of the living standard of the people year by year. The intake of calcium in different age groups should not be less than the RDA of China, otherwise the BMD will decrease. Supplementation of calcium for children, pregnant women, breast feeding women and old age is espescially important. HRT increases intestinal calcium absorption and decreases renal calcium excretion. The adequate intake of calcium is suggested to be 1 300 mg/d in children and adolescent, and 1 500 mg/d in old age. Intake of calcium should not be over 2.5 g/d in all age.
出处
《基础医学与临床》
CSCD
1998年第6期1-6,共6页
Basic and Clinical Medicine
关键词
钙
骨代谢
骨质疏松
calcium bone calcium metabolism osteoporosis calcium intake
