Michelia Essential Oil Inhalation Increases Fast Alpha Wave Activity

Koomhin, Phanit; Sattayakhom, Apsorn; Chandharakool, Supaya; Sinlapasorn, Jennarong; Suanjan, Sarunnat; Palipoch, Sarawoot; Na-Ek, Prasit; Punsawad, Chuchard; Matan, Narumol

doi:10.3390/scipharm88020023

Cited by 11 publications

(11 citation statements)

References 23 publications

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“…Garlic oil demonstrated the lowest threshold property compared with Litsea cubeba and Curcuma longa oils. The increase in alpha wave power can be observed in several essential oil, such as white champaka, eucalyptus, lavender, and Zizyphus jujuba oils [ 14 , 26 , 27 , 28 ]. This alteration is related to psychometric responses, a relaxing effect, an increase in attention and relaxation.…”

Section: Discussionmentioning

confidence: 99%

“…Demographic data were shown in Table 3 . The method was slighted modified from Kim et al, 2018, and Koomhin et al, 2020 [ 14 , 32 ]. To replicate odor or fragrance application in the real-life situation, the odor was attached near volunteer nose.…”

Section: Methodsmentioning

confidence: 99%

“…Phellandrene is found in Curcuma longa , rosemary, eucalyptus, etc. Essential oil affects the human nervous system depending on its composition and concentration [ 14 ]. Inhalation of essential oil has been reported to alter the arousal state of the human brain ranging from stimulatory effects to sedative effects.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Thai Local Ingredient Odorants, Litsea cubeba and Garlic Essential Oils, on Brainwaves and Moods

et al. 2021

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The functional food market is growing with a compound annual growth rate of 7.9%. Thai food recipes use several kinds of herbs. Lemongrass, garlic, and turmeric are ingredients used in Thai curry paste. Essential oils released in the preparation step create the flavor and fragrance of the famous tom yum and massaman dishes. While the biological activities of these ingredients have been investigated, including the antioxidant, anti-inflammatory, and antimicrobial activities, there is still a lack of understanding regarding the responses to the essential oils of these plants. To investigate the effects of essential oil inhalation on the brain and mood responses, electroencephalography was carried out during the non-task resting state, and self-assessment of the mood state was performed. The essential oils were prepared in several dilutions in the range of the supra-threshold level. The results show that Litsea cubeba oil inhalation showed a sedative effect, observed from alpha and beta wave power reductions. The frontal and temporal regions of the brain were involved in the wave alterations. Garlic oil increased the alpha wave power at lower concentrations; however, a sedative effect was also observed at higher concentrations. Lower dilution oil induced changes in the fast alpha activity in the frontal region. The alpha and beta wave powers were decreased with higher dilution oils, particularly in the temporal, parietal, and occipital regions. Both Litsea cubeba and turmeric oils resulted in better positive moods than garlic oil. Garlic oil caused more negative moods than the others. The psychophysiological activities and the related brain functions require further investigation. The knowledge obtained from this study may be used to design functional food products.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effects of Thai Local Ingredient Odorants, Litsea cubeba and Garlic Essential Oils, on Brainwaves and Moods

et al. 2021

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“…Subjects’ baseline characteristics are shown in Table 4 ; Table 5 . The method was slighty modified from Koomhin et al 2020 [ 36 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of Tangerine Essential Oil on Brain Waves, Moods, and Sleep Onset Latency

et al. 2020

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Tangerine (Citrus tangerina) is one of the most important crops of Thailand with a total harvest that exceeds 100,000 tons. Citrus essential oils are widely used as aromatherapy and medicinal agents. The effect of tangerine essential oil on human brain waves and sleep activity has not been reported. In the present study, we therefore evaluated these effects of tangerine essential oil by measurement of electroencephalography (EEG) activity with 32 channel platforms according to the international 10–20 system in 10 male and 10 female subjects. Then the sleep onset latency was studied to further confirm the effect on sleep activity. The results revealed that different concentrations, subthreshold to suprathreshold, of tangerine oil gave different brain responses. Undiluted tangerine oil inhalation reduced slow and fast alpha wave powers and elevated low and mid beta wave powers. The subthreshold and threshold dilution showed the opposite effect to the brain compared with suprathreshold concentration. Inhalation of threshold concentration showed effectively decreased alpha and beta wave powers and increased theta wave power, which emphasize its sedative effect. The reduction of sleep onset latency was confirmed with the implementation of the observed sedative effect of tangerine oil.

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“…In the present study, the alpha component placed at each participant's occipital lobe showed significant increases during the inhalation of the LG sample of common rush. Previous studies have shown that the alpha component can increase when participants perceive scents produced by natural plants [32]. One of the compounds, benzaldehyde, was used as a chemical flavoring, particularly to mimic "cool mint".…”

Section: Discussionmentioning

confidence: 99%

Physiological and Psychological Effects of Volatile Organic Compounds from Dried Common Rush (Juncus effusus L. var. decipiens Buchen.) on Humans

Sun

Nakashima

Yoshimura

et al. 2022

IJERPH

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This study compared the participants’ physiological responses and subjective evaluations of air scented with different concentrations of common rush (Juncus effusus L. var. decipiens Buchen.) (30 g and 15 g, with fresh air as a control). We asked 20 participants to complete a series of visual discrimination tasks while inhaling two different air samples. We evaluated (1) brain activity, (2) autonomic nervous activity, and (3) blood pressure and pulse rate, (4) in combination with self-evaluation. In addition, we quantified the concentrations of volatile organic compounds. The participants reported the scent to be sour, pungent, and smelly; this impression was likely caused by hexanal and acetic acid. Although the self-evaluations showed that participants did not enjoy the scent, their alpha amplitudes of electroencephalogram and parasympathetic nervous activity were increased, suggesting that participants were relaxed in this atmosphere. Moreover, a lower concentration resulted in a greater induction of relaxation. While the air was not pleasant-smelling, the volatile organic compounds present had a positive psychophysiological impact.

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Michelia Essential Oil Inhalation Increases Fast Alpha Wave Activity

Cited by 11 publications

References 23 publications

Effects of Thai Local Ingredient Odorants, Litsea cubeba and Garlic Essential Oils, on Brainwaves and Moods

Effects of Thai Local Ingredient Odorants, Litsea cubeba and Garlic Essential Oils, on Brainwaves and Moods

Effects of Tangerine Essential Oil on Brain Waves, Moods, and Sleep Onset Latency

Physiological and Psychological Effects of Volatile Organic Compounds from Dried Common Rush (Juncus effusus L. var. decipiens Buchen.) on Humans

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