目的 观察颈椎牵引在不同加载重量和牵引角度时颈部肌肉表面肌电（electromyography, EMG）信号的变化特点，并与AnyBody软件中颈椎建模仿真所得的相关肌肉力活性变化特点进行对比，验证仿真结果的合理性。方法 选取10例青年志愿者，行仰卧位颈椎牵引，JE-TB0810表面肌电仪测试颈部双侧胸锁乳突肌、斜方肌上部EMG信号，利用平均肌电值（average EMG, AEMG）和平均功率频率（mean power frequency, MPF）分析颈部EMG信号的变化规律。结果 斜方肌上部和胸锁乳突肌AEMG均随着加载重量和牵引角度的增大而增大，差异均具有统计学意义（P<0.05），斜方肌上部AEMG较胸锁乳突肌高，差异有统计学意义（P<0.05）；2对肌肉在不同牵引角度和加载重量下MPF比较，差异无统计学意义（P>0.05）；实验结果与颈椎牵引建模仿真所得斜方肌上部和胸锁乳突肌肌肉力活性特点相符。结论 仿真结果具有一定的合理性，临床上可根据颈部肌肉的兴奋程度和疲劳时间合理施加牵引重量，既达到治疗效果，也提高患者的舒适性，为颈椎牵引设备的进一步研制和改进提供重要的参考。

Objective To observe changes of surface electromyography (sEMG) in cervical traction under different loading weight and at different angles, and compare the muscle activity changes obtained by experiment with simulation results obtained by AnyBody cervical modeling, so as to verify the rationality of the simulation results. Methods Ten young volunteers with supine cervical traction were selected to test the sEMG signals of bilateral sternocleidomastoid (SCM) and upper trapezius (UT) muscles by using the JE-TB0810 surface EMG device. The average EMG (AEMG) and mean power frequency (MPF) were used to analyze the variation patterns of sEMG in cervical spine. Results The AEMG values of SCM and UT muscles increased as the loading weight and traction angles increasing, with a statistically significant difference (P<0.05). The AEMG values of UT muscles was higher than that of SCM muscles, also with a statistically significant difference (P<0.05). No statistical differences were found in the MPF values at different traction angles and under different loading weight for both SCM and UT muscles (P>0.05). The experimental results were consistent with muscle force activity characteristics of SCM and UT muscles by modeling and simulation of cervical traction. Conclusions The simulation results are reasonable. The traction weight should be loaded reasonably according to the excitation and fatigue of the cervical muscles in clinic. This can both reach the treatment effect and improve the patient’s comfort, which will provide an important reference for further development and improvement of the cervical traction device.

国家重大科学研究计划（2012CB933604，2011CB013300），国家高技术研究发展计划 “863计划”（2015AA020308），国家自然科学基金项目（81171707， 8157090044），上海市科委产学研医项目（14DZ1941102，15DZ1942104），上海市卫生系统重要疾病联合攻关项目（2013ZYJB0501），上海教委重点学科建设基金（J50206），上海市卫生计生系统重要薄弱学科基金（2015ZB0404），上海交通大学医学院转化医学创新基金项目，上海交通大学医学院高峰高原计划-“研究型医师”项目（20152224）