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http://dx.doi.org/10.5352/JLS.2013.23.9.1170

Effect of Essential Oil from San-Jo-In (Zizyphus jujuba Mill. seeds) on Human Electroencephalographic Activity  

Cho, Haeme (Department of Biological Environment, Kangwon National University)
Yu, Byoungsun (Department of Biological Environment, Kangwon National University)
Sowndhararajan, Kandhasamy (Department of Biological Environment, Kangwon National University)
Jung, Ji-Wook (Department of Herbal Medicinal Pharmacology, Daegu Haany University)
Jhoo, Jin-Woo (Department of Animal Products and Food Science, Kangwon National University)
Kim, Songmun (Department of Biological Environment, Kangwon National University)
Publication Information
Journal of Life Science / v.23, no.9, 2013 , pp. 1170-1176 More about this Journal
Abstract
Essential oils have been used to treat psychophysiological disorders, but their effects on human electroencephalographic (EEG) activity have not been thoroughly investigated. We evaluated the effects of essential oil of Zizyphus jujuba seeds, a Korean folk medicine known as San-Jo-In, on human EEG activity. For this purpose, essential oil was extracted from San-Jo-In by the supercritical carbon dioxide extraction method. The effect of its inhalation on EEG activity was evaluated by measuring the EEG power spectrum (25 indices) in 20 healthy participants. The results of the EEG power spectrum indicated that the values of the theta wave decreased significantly (p<0.05) in the left (from 17.277 to $13.854{\mu}V$) and right parietal (from 15.324 to $13.020{\mu}V$) regions compared to the other regions. During the inhalation of San-Jo-In oil, the EEG spectrum values of fast alpha, relative gamma, and spectral edge frequency increased 50% compared to those before inhalation. The values of the fast alpha wave increased significantly (p<0.05) in the left prefrontal (from 0.063 to $0.085{\mu}V$), right prefrontal (from 0.064 to $0.085{\mu}V$), and left frontal (from 0.073 to $0.100{\mu}V$) regions following inhalation of the San-Jo-In essential oil. The changes in the EEG activities following inhalation of San-Jo-In suggest that the oil can improve psychological well-being by increasing attention and relaxation.
Keywords
Aromatherapy; electroencephalogram; essential oil; San-Jo-In; Zizyphus jujuba;
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