仿生脉冲电磁场预防性治疗对大鼠继发性骨质疏松骨密度的影响

目的 观察仿生脉冲电磁场(bionic pulsed electromagnetic fields,BEMF)对Wistar大鼠骨质疏松动物模型不同时间点的预防性治疗作用.方法 本实验取32只3月龄雌性Wistar大鼠,分成4组:正常对照组(A组)8只,地塞米松组(B组)8只,降钙素组(C组)8只,电磁场组(D组)8只.A组常规喂养,同时给予注射等量生理盐水,B组仅给予地塞米松注射(1 mg/kg,肌注、2次/周),C组及D组在给予地塞米松(1 mg/kg,肌注,2次/周)的同时分别给予降钙素(2 IU/kg,皮下注射,1次/d)及电磁场照射(1 h/次,1次/d)预防性治疗,以上各组均分别于第4、8、12周不同时间点在麻醉状态下测取腰椎及股骨的骨密度值,以观察各不同时间点各组大鼠骨密度的改变.结果 BEMF预防性治疗4周各组大鼠骨密度无显著性差异(P＞0.05),8周D组较B组骨密度高(P＜0.01),12周D组较B组骨密度高(P＜0.01),D组较C组股骨骨密度亦显著增高(P＜0.05).结论 BEMF有预防骨密度下降的作用,并随着预防治疗时间的延长,BEMF的预防作用较降钙素有更显著的效果.

Preventive effect of bionic pulsed electromagnetic fields on bone mineral density

Objective To observe the short-term and long-term effect of preventive therapy of bionic pulsed electromagnetic fields(BEMF) on the osteoporosis model of Wistar rats.Methods Thirty-two 3-month-old female Wistar rats were randomly divided into 4 groups with 8 rats in each group: control group(group A),desamethasone group(group B),calcitonin group(group C) and BEMF group(group D).Rats in group A were raised normally and received normal saline.Rats in group B were injected with desamethasone only(1 mg/kg,intramuscularly,twice a week).Rats in group C were injected with calcitonin(2 IU/kg,subcutaneously,once a day) and rats in group D were irradiated with BEMF for preventive therapy,simultaneouly all rats were injected with desamethasone(1 mg/kg,intramuscularly,twice a week).The rat bone mineral density(BMD) was measured under narcosis at 4,8,12 weeks after starting preventive therapy.Results No significant differences in BMD were found among all groups 4 weeks later.The significant differences in BMD were observed between group D and group B 8 weeks later and lasted to 12 weeks(P<0.01).There was significant differences in BMD of femur between group D and group C 12 weeks later(P<0.05).Conclusion BEMF preventive therapy is effective in preventing the BMD decline in Wistar rats.BEMF is more effective than calcitonin as the therapy time prolongs.