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Changes in Sensory Function After Transcranial Direct Current Stimulation Primary Motor Cortex Area

한국전문물리치료학회지 2014년 21권 4호 p.1 ~ 8
민동기,
소속 상세정보
민동기 ( Min Dong-Ki ) - Keimyung University College of Medicine Dongsan Medical Center Department of Rehabilitation Medicine

Abstract


Transcranial direct current stimulation (tDCS) is a neuromodulatory technique that delivers low-intensity direct current to cortical areas, thereby facilitating or inhibiting spontaneous neuronal activity. This study was designed to investigate changes in various sensory functions after tDCS. We conducted a single-center, single-blinded, randomized trial to determine the effect of a single session of tDCS with the current perception threshold (CPT) in 50 healthy volunteers. Nerve conduction studies were performed in relation to the median sensory and motor nerves on the dominant hand to discriminate peripheral nerve lesions. The subjects received anodal tDCS with 1 ㎃ for 15 minutes under two different conditions, with 25 subjects in each groups: the conditions were as follows tDCS on the primary motor cortex (M1) and sham tDCS on M1. We recorded the parameters of the CPT a with Neurometerⓡ at frequencies of 2000, 250, and 5 ㎐ in the dominant index finger to assess the tactile sense, fast pain and slow pain, respectively. In the test to measure CPT values of the M1 in the tDCS group, the values of the distal part of the distal interphalangeal joint of the second finger statistically increased in all of 2000 ㎐ (p=.000), 250 ㎐ (p=.002), and 5 ㎐ (p=.008). However, the values of the sham tDCS group decreased in all of 2000 ㎐ (p=.285), 250 ㎐ (p=.552), and 5 ㎐ (p=.062), and were not statistically significant. These results show that M1 anodal tDCS can modulate sensory perception and pain thresholds in healthy adult volunteers. The study suggests that tDCS may be a useful strategy for treating central neurogenic pain in rehabilitation medicine.

키워드

Current perception threshold; Primary motor cortex area; Sensory function; Transcranial direct current stimulation

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