青少年特发性脊柱侧弯症患者椎旁肌表面肌电信号频域指标变化规律

Patterns of Frequency Domain Indexes of Surface Electronic Signals of Adolescent Idiopathic Scoliosis Patients' Paraspinal Muscles

目的采用表面肌电图(sEMG)检测技术对青少年特发性脊柱侧弯症(AIS)患者脊柱旁椎旁肌肌电活动频域指标变化规律进行初步探讨。方法AIS患者25例,男7例,女18例,年龄11～21岁;所有患者均执行BST实验、抬物实验,采用芬兰ME6000型表面肌电仪记录患者凸、凹侧椎旁肌表面肌电信号频域指标中位频率(MF)、平均功率频率(MPF)、过零点率(ZCR)。结果AIS患者顶椎区凸、凹侧MF、MPF、ZCR波形曲线波幅较其他测试部位低平、数值降低,MF斜率(MFslope)、MPF斜率(MPFs-lope)、ZCR斜率(ZCRslope)随运动负荷时间的延长均呈线性递减。结论AIS患者脊柱旁顶椎区椎旁肌耐力较差,容易疲劳,表面肌电图可用作评定AIS脊柱旁凸、凹侧肌电活动差别的客观指标之一,具有较好的临床应用价值。

Objective To investigate the patterns of frequency domain indexes of surface electronic signals of adolescent idiopathic scoliosis （AIS） patients＇ paraspinal muscles by using surface electromyographic （sEMG） techniques.Methods 25 AIS patients enrolled,7 males,18 females,ages range from 11 to 21 years old.All of the enrolled patients undertook the Biering Sorensen test（BST） and the object-lifting test,a Finland made type ME3000P sEMG instrument was applied to record the electronic activities of paraspinal muscles（convex /concave） of all subjects,and the frequency domain indexes：median frequency（MF）,mean power frequency（MPF）,zero crossing rate（ZCR）were analyzed.Results The wave amplitudes and scales of paraspinal muscles electronic frequency domain indexes（MF,MPF,ZCR） were lower than the other tested positions when recorded at the zone of apex vertebrae,and MFslope,MPFslope and ZCRslope all showed a linear degressive tendency as the exercise time was extended.Conclusion Paraspinal muscles at the zone of apex vertebrae have low fatigue durabilities and more likely to be exhausted.sEMG ought to be one of the objective examinations used to evaluate the differences of electronic activities of paraspinal muscles（convex /concave） of AIS patients,and may have a promising value in clinical practice.