长期饮用学生奶与儿童骨密度的关系

目的了解长期饮用学生奶对儿童骨密度的影响。方法于2009年7月份,在湖南省长沙市整群抽取435名10～12岁学生(其中男生188名,女生247名),调查学生奶饮用情况,根据学生饮奶频率和连续饮奶的时间,将被调查的学生分为长期饮奶组(连续1年以上和坚持每周饮奶4次以上或连续3年以上每周饮奶1～3次者为长期饮奶组,220人)和较少饮奶组,测定其右前臂长度、桡尺骨远端1/3处骨宽度(BW)、骨矿物质含量(BMC)和骨密度(BMD)、血磷和钙含量。结果长期饮奶组男孩右前臂长(22.53cm±1.63cm vs.21.95cm±1.75cm,P<0.05)、桡骨BW(1.370cm±0.237cm vs.1.300cm±0.176cm,P<0.05)、桡骨BMC(0.690±0.270 vs.0.599±0.090,P<0.01)、桡骨BMD(0.498±0.135 vs.0.462±0.055,P<0.05);女孩桡骨BMD(0.489±0.076 vs.0.469±0.081,P<0.05)、尺骨BMC(0.564±0.176 vs.0.512±0.100,P<0.01、尺骨BMD(0.470±0.129 vs.0.439±0.059,P<0.05均明显高于较少饮奶组。儿童饮用学生奶与奶制品的种类和性状密切相关。结论长期饮用学生奶可增加儿童骨密度,奶制品的种类及性状影响学生奶计划的实施与推广。

Relation of long-term consumption of school milk to bone density in children

Objective To evaluate the status of bone density of children consumed school milk for relative long-term period.Methods According to the frequency and duration that children had consumed school milk,cluster sampling of 435 children(10-12years old,including 188 boys and 247 girls.) were sampled to divided into two groups,that is milk consumption group and seldom milk consumption group,the children in milk consumption group had consumed the school milk 4 time weekly and duration for more than 1 year or 1-3 times weekly and duration for more than 3 years and this group included 220 children.Right forearm length,bone width of 1 /3 distal end of radius and ulna,bone mineral content,bone density,serum calcium and phosphorus contents were determined.The research was carried out from July to August(2009) in Changsha,Hunan Province.Results Right forearm length of the milk consumption group boys(22.53cm ± 1.63cm) was significantly longer than that of seldom milk consumption group(21.95cm ± 1.75cm),P < 0.05,radius width(1.370 ± 0.237cm) was significantly larger than that of seldom milk consumption group(1.300cm ± 0.176cm),P < 0.05,bone mineral content(0.690 ± 0.270) was significantly higher than that of seldom milk consumption group(0.599 ± 0.090),P < 0.01,bone density of radius(0.498 ± 0.135) was significantly higher than that of seldom milk consumption group(0.469 ± 0.081),P < 0.05.Bone density of radius of girls(0.489 ± 0.076) was significantly higher than that of seldom milk consumption group(0.469 ± 0.081),P < 0.05,bone mineral content of ulna(0.564 ± 0.176) was significantly higher than that of seldom milk consumption group(0.512 ± 0.100),P < 0.01,bone density of ulna(0.470 ± 0.129) was significantly higher than that of seldom milk consumption group(0.439 ± 0.059),P < 0.05.The state of children consumed school milk was correlative closely with type and characteristics of milk.Conclusion The long-term consumption of school milk could increase their bone density and the type and characteristics of milk would haveeffect on the practice and generalization of the school milk planning.