Hsieh C L, Lin J G, Li T C, Chang Q Y
School of Chinese Medicine, China Medical College, Taichung, Taiwan.
Am J Chin Med. 1999;27(1):11-8. doi: 10.1142/S0192415X99000033.
The purpose of this study was to investigate the effect of electroacupuncture stimulation (EA) of different frequency on pulse rate and skin temperature. Sixteen healthy male medical student volunteers received EA of 2 Hz, and 100 Hz, respectively on the both Zusanli acupoints (St-36) while resting. Their pulse rates were measured on the middle finger, and skin temperature was taken between the thumb and index finger before, during, and after EA stimulation. Each test took 35 minutes. The initial 10 min were defined as baseline period (no EA), the following 15 min as the EA period and the last 10 min as the post-EA period. Three assessments were performed on each subject as follows: A) control assessment: no EA was done throughout the test; B) 2 Hz EA assessment: 2 Hz EA was applied to both Zusanli acupoints during the EA period; and C) 100 Hz EA assessment: 100 Hz EA was applied to both Zusanli acupoints during the EA period. Our results indicate that both 2 Hz EA and 100 Hz EA decreased pulse rates during the EA period, and these changes remained throughout the post-EA period in 2 Hz EA assessment, but not in 100 Hz EA assessment. Both 2 Hz and 100 Hz EA resulted in decreases of skin temperature during the EA period. Our conclusions are that 2 Hz EA and 100 Hz EA applied to both Zusanli acupoints resulted in the decrease of pulse rate, which possibly evoked greater parasympathetic nerve activity on heart beats. 2 Hz EA had a more sustained effect on heart beats than 100 Hz EA. Decreased skin temperatures in the EA period may have resulted from cutaneous vasoconstriction caused by EA induced sympathetic stress response, suggesting EA at least remains for 15 min in clinical application.
本研究旨在探讨不同频率电针刺激（EA）对脉搏率和皮肤温度的影响。16名健康男性医学生志愿者在休息时分别接受双侧足三里穴（St-36）2Hz和100Hz的电针刺激。在电针刺激前、刺激期间和刺激后，测量他们中指的脉搏率，并采集拇指和食指之间的皮肤温度。每次测试持续35分钟。最初的10分钟定义为基线期（无电针刺激），接下来的15分钟为电针刺激期，最后10分钟为电针刺激后期。对每个受试者进行如下三项评估：A）对照评估：整个测试过程中不进行电针刺激；B）2Hz电针刺激评估：在电针刺激期对双侧足三里穴施加2Hz电针刺激；C）100Hz电针刺激评估：在电针刺激期对双侧足三里穴施加100Hz电针刺激。我们的结果表明，2Hz电针刺激和100Hz电针刺激在电针刺激期均使脉搏率降低，并且在2Hz电针刺激评估中，这些变化在电针刺激后期持续存在，但在100Hz电针刺激评估中则不然。2Hz和100Hz电针刺激在电针刺激期均导致皮肤温度下降。我们的结论是，双侧足三里穴施加2Hz电针刺激和100Hz电针刺激均导致脉搏率降低，这可能诱发了对心跳更强的副交感神经活动。2Hz电针刺激对心跳的影响比100Hz电针刺激更持久。电针刺激期皮肤温度下降可能是由电针诱导的交感应激反应引起的皮肤血管收缩所致，这表明电针在临床应用中至少应持续15分钟。
