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KMID : 0389520210280020053
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Sleep Medicine.Psychophysiology
2021 Volume.28 No. 2 p.53 ~ p.69
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A Review on Effects of Non-Invasive Brain Stimulation in the Treatment of Sleep Disorders
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Kim Shin-Hye
Lee Su-Ji
Lim Soo-Mee
Yoon Su-Jung
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Abstract
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Sleep disorders, increasingly prevalent in the general population, induce impairment in daytime functioning and other clinical problems. As changes in cortical excitability have been reported as potential pathophysiological mechanisms underlying sleep disorders, multiple studies have explored clinical effects of modulating cortical excitability through non-invasive brain stimula- tion in treating sleep disorders. In this study, we critically reviewed clinical studies using non-invasive brain stimulation, partic- ularly transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS), for treatment of sleep disor- ders. Previous studies have reported inconsistent therapeutic effects of TMS and tDCS for various kinds of sleep disorders. Specifically, low-frequency repetitive TMS (rTMS) and cathodal tDCS, both of which exert an inhibitory effect on cortical excit- ability, have shown inconsistent therapeutic effects for insomnia. On the other hand, high-frequency rTMS and anodal tDCS, both of which facilitate cortical excitability, have improved the symptoms of hypersomnia. In studies of restless legs syn- drome, high-frequency rTMS and anodal tDCS induced inconsistent therapeutic effects. Single TMS and rTMS have shown differential therapeutic effects for obstructive sleep apnea. These inconsistent findings indicate that the distinctive character- istics of each non-invasive brain stimulation method and specific pathophysiological mechanisms underlying particular sleep disorders should be considered in an integrated manner for treatment of various sleep disorders. Future studies are needed to provide optimized TMS and tDCS protocols for each sleep disorder, considering distinctive effects of non-invasive brain stimulation and pathophysiology of each sleep disorder.
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KEYWORD
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Sleep disorders, Transcranial direct current stimulation, Transcranial magnetic stimulation, Neural activity, Non-inva- sive brain stimulation
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