Wang Ninghua, Hui-Chan Christina
Department of Physical Medicine and Rehabilitation, the First Hospital, Peking University, Beijing 100034, China.
Chin Med J (Engl). 2003 Dec;116(12):1864-8.
To delineate the influence of transcutaneous electrical nerve stimulation (TENS) on heat pain threshold and vibration threshold in human.
Twenty healthy, young subjects, aged from 20 to 39, participated in the study. They were randomly allocated into either TENS or placebo group. Thirty minutes of conventional TENS (200 micro s pulses at 100 Hz and 2 - 3 times sensory threshold) or placebo stimulation was applied to the acupuncture points (LI4) on each subject's left hand. Heat pain and vibration thresholds were measured using Medoc TSA-2001 and VSA-3000 respectively on the thenar eminence of each subject's left hand. These assessments were done at 30, 20 and 10 minutes before and 0, 10, 20, 30, 40 and 50 minutes after 30 minutes of TENS or placebo treatment.
This study showed a significant increase in heat pain threshold by 0.81 degrees C and 1.54 degrees C respectively at 0 (P = 0.002) and 20 minutes (P = 0.004) after 30 minutes of TENS application to the LI4 acupoint of young healthy subjects, compared with placebo stimulation. Interestingly, no significant difference in vibration threshold was found between the TENS and placebo groups.
The effect of TENS on the acupoint is to reduce pain but not tactile (specifically vibration) sensibility.
探讨经皮电刺激神经疗法（TENS）对人体热痛阈和振动阈的影响。
20名年龄在20至39岁之间的健康年轻受试者参与了本研究。他们被随机分为TENS组或安慰剂组。对每位受试者左手的穴位（合谷穴）施加30分钟的传统TENS（100Hz、200微秒脉冲，强度为感觉阈的2 - 3倍）或安慰剂刺激。分别使用Medoc TSA - 2001和VSA - 3000在每位受试者左手的鱼际肌测量热痛阈和振动阈。这些评估在TENS或安慰剂治疗30分钟前的30、20和10分钟以及治疗后的0、10、20、30、40和50分钟进行。
本研究表明，对年轻健康受试者的合谷穴施加30分钟TENS后，与安慰剂刺激相比，热痛阈在0分钟（P = 0.002）和20分钟（P = 0.004）时分别显著升高0.81℃和1.54℃。有趣的是，TENS组和安慰剂组之间的振动阈没有显著差异。
TENS作用于穴位的效果是减轻疼痛，但不影响触觉（特别是振动觉）敏感性。
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