Objective To observe the character of amplitude of myoelectric activity with surface electromyography (sEMG) on pharyn-geal swallowing in healthy middle-aged and elderly people. Methods From January, 2015 to January, 2016, 78 healthy subjects were separat-ed into middle-aged group (38~60 years old, n=38) and elderly group (61~82 years old, n=40). The amplitudes of sEMG activity of related muscles under different swallowing modes were recorded by sEMG technique and analysis system. The root mean square (RMS) was ana-lyzed. Results There was significant difference in RMS among different swallowing modes (F>105.120, P<0.001). There was no difference in RMS between two muscles under all the swallowing modes in both groups (t<1.135, P>0.05). There was no difference between two groups in both muscles under relax and dry swallow (t<1.412, P>0.05), and was different under water swallow and continuous drinking (t>2.700, P<0.05). Conclusion sEMG could be used for analyzing the characteristics of amplitude of myoelectric activity in healthy mid-dle-aged and elderly people during pharyngeal swallowing in different swallowing modes, that can be used to evaluate and screen swallow-ing and dysphagia in clinic.%目的：观察正常中老年人咽期吞咽相关肌群在不同吞咽模式下肌电活动振幅水平的特点。方法2015年1月~2016年1月，78例正常健康受试者按年龄分为中年组(38~60岁，n=38)和老年组(61~82岁，n=40)。应用表面肌电技术与分析系统，记录受试者不同吞咽模式下咽期吞咽相关肌群肌电活动的振幅均方根值(RMS)。结果不同吞咽模式下两组不同吞咽肌群RMS均有非常高度显著性差异(F>105.120, P<0.001)。在同组中，舌骨下肌群和颏下肌群在不同吞咽模式下，RMS均无显著性差异(t<1.135, P>0.05)。中年组与老年组相比，无论哪组肌群，放松状态及干吞咽状态RMS均无显著性差异(t<1.412, P>0.05)；而含水吞咽及连续饮水吞咽状态，老年组RMS较中年组低(t>2.700, P<0.05)。结论表面肌电技术可对正常中老年人不同吞咽模式不同吞咽肌群肌电活动振幅水平进行检测分析，初步揭示吞咽相关肌群肌肉活动强度的特征，为临床筛查和评估吞咽障碍提供科学参考依据。
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