强化钙与维生素D牛奶对10～12岁女童体格发育的影响

Effects of calcium and vitamin D-fortified milk on physical development in school girls aged 10 to 12 years

目的 探讨补充强化钙与维生素D牛奶对我国 1 0～ 1 2岁女童体格发育的影响。方法1 999年 3月至 2 0 0 1年 3月 ,我们进行了为期 2年、设有对照的双盲干预实验。将北京市 9所小学 757名平均年龄 1 0 1岁的女童分为对照组 (2 59人 ,保持日常饮食 )、A组 (2 38人 ,除日常饮食外 ,饮用钙强化牛奶 1 4 4ml/d)和B组 (2 60人 ,除日常饮食外 ,饮用钙和维生素D强化牛奶 1 4 4ml/d)。调查其食物摄入和体力活动情况。干预前、中、后测定研究对象的体重、身高、坐高及膝高。结果 干预 2年后 ,A组和B组的身高增长率 (9 52 %和 9 2 6 % )显著高于对照组的 8 59% ;A组和B组的体重增长率(34 53 %和 35 38% )显著高于对照组的 30 91 % ;A组的坐高增长率为 9 2 1 % ,显著高于B组的8 58% ,又高于对照组的 7 87% ;A组膝高的增长率为 9 0 0 % ,显著高于B组 (8 37% )和对照组(8 44% )。结论 长期补充强化钙与维生素D的牛奶可能会促进我国 1 0～ 1

Objectives To investigate the effects of calcium and vitamin D supplementation in fortified milk on physical development in Chinese school girls aged 10?-12 years Methods A non randomized,double blind intervention trial was carried out at nine primary schools of Beijing for two years Seven hundred and fifty seven girls (with an average age of 10 1 years) were recruited from nine primary schools in Beijing,China They were divided into three trial groups,a control group ( n =259) having regular diet without milk supplementation,Group 1 ( n =238) having regular diet supplemented with 144 ml/d of calcium fortified milk,and Group 2 ( n =260) having regular diet supplemented with 144 ml/d of calcium and vitamin D fortified milk Data of dietary intake and physical activities were collected by questionnaire,and height,weight,sitting height and knee height were measured before,during and after intervention Results Two years after intervention,the percentage increases in height and weight were significantly greater in Groups 1 and 2 than those in control group(9 52%,9 26% and 8 59% in height,and 34 53%,35 38% and 30 91% in weight,respectively) The percentage increase of sitting height was greater in Group 1 than those in Group 2, and then than that in control group (9 21%,8 58% and 7 87%,respectively) The percentage increase of knee height was significantly greater in Group 1 than that in Group 2 and control group(9 00%,8 37% and 8 44%,respectively) Conclusion Calcium and vitamin D fortified milk supplementation could promote their physical development in girls aged 10?-12 years