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在胎儿生长发育过程中,孕妇体内的钙会主动经胎盘转运给胎儿。孕妇除了提供给胎儿大量的钙外,由于其自身循环血量的增加,使血钙浓度相对降低,因此容易出现低血钙。机体则从降钙素的变化来保住母体骨钙不被过多地再吸收,因而动用肌肉、结缔组织中的钙,使孕妇出现小腿抽筋、腰腿
In the process of fetal growth and development, calcium in pregnant women will be transported to the fetus through the placenta. In addition to providing a large number of pregnant women with fetal calcium, due to its own increased circulating blood volume, so that relatively lower serum calcium concentrations, and therefore prone to hypocalcemia. The body changes from calcitonin to maintain the mother’s bone calcium is not reabsorbed too much, and thus use muscle, connective tissue calcium, pregnant women appear calf cramps, waist and legs