Why Acupuncture and TENS are Different?
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.
Source: Kang YT,
Liao YS,
Hsieh CL.
Different
effects of transcutaneous electric nerve stimulation and electroacupuncture at
ST36-ST37 on the cerebral cortex. Acupunct Med.
2014 Nov 28.