Methods Forty 6-month old female Wistar rats were randomly divided into four different groups according to body mass: ovariectomy group(OVX),sham operation group (Sham), E group (Estrogen+ OVX) and EM group(BEMF+OVX).

• 方法6月龄雌性未孕Wistar大鼠40只,按体质量随机分为模型组(OVX)、假手术组(Sham)、仿生脉冲电磁场治疗组(BEMF+OVX,EM)、雌激素治疗组(Estrogen+OVX,E)。