Kang Yu-Tien, Liao Yi-Sheng, Hsieh Ching-Liang
Graduate Institute of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan Department of Traditional Chinese Medicine, Taichung Veterans General Hospital, Taichung, Taiwan.
Department of Neurology, Taichung Hospital, Ministry of Health and Welfare, Taichung, Taiwan.
Acupunct Med. 2015 Feb;33(1):36-41. doi: 10.1136/acupmed-2014-010650. Epub 2014 Nov 28.
The effects of transcutaneous electric nerve stimulation (TENS) and electroacupuncture (EA) on the cerebral cortex are largely unclear. The purpose of the present study was to investigate the effect of TENS and EA on the cerebral cortex by examining their effect on the median nerve-somatosensory evoked potentials (MN-SEPs).
Twenty volunteers were studied. The cortical and cervical spinal potentials were recorded by median nerve stimulation at the left wrist. Sham TENS, 2 Hz TENS and 2 Hz EA were applied to both ST36 and ST37. MN-SEPs were recorded during sham TENS, 2 Hz TENS and 2 Hz EA, with at least 1 week interval for each subject. One-way analysis of variance was used to determine the differences in latency and amplitude of the MN-SEPs observed in the stimulation and post-stimulation periods compared with baseline. Scheffe's post hoc correction was employed to identify pairwise differences.
No differences in mean latency were found between the stimulation procedures during the stimulation and post-stimulation periods. 2 Hz EA but not sham TENS or 2 Hz TENS caused higher mean amplitudes in N20 and N30 during the stimulation and post-stimulation periods.
EA, but not TENS, induces changes in certain components of the signal.
经皮电刺激神经疗法（TENS）和电针疗法（EA）对大脑皮层的影响尚不清楚。本研究旨在通过检测经皮电刺激神经疗法和电针疗法对正中神经体感诱发电位（MN-SEP）的影响，来研究它们对大脑皮层的作用。
对20名志愿者进行研究。通过刺激左手腕正中神经来记录皮层和颈脊髓电位。对双侧足三里穴（ST36）和上巨虚穴（ST37）施加假TENS、2Hz TENS和2Hz EA。在假TENS、2Hz TENS和2Hz EA期间记录MN-SEP，每位受试者各刺激之间至少间隔1周。采用单因素方差分析来确定与基线相比，刺激期和刺激后期MN-SEP潜伏期和波幅的差异。采用谢费尔事后检验来确定两两之间的差异。
在刺激期和刺激后期，各刺激程序之间的平均潜伏期无差异。在刺激期和刺激后期，2Hz EA而非假TENS或2Hz TENS使N20和N30的平均波幅更高。
电针疗法而非经皮电刺激神经疗法会引起信号某些成分的变化。
