Effect of Smelling Green Tea on Mental Status and EEG Activity

Murao, Sato; Yoto, Ai; Yokogoshi, Hidehiko

doi:10.5057/ijae.12.37

Cited by 29 publications

(18 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Psychological effects measured in terms of VAS score were not significant in our study for any aroma, whereas positive psychological effects are reported in the past with Chocolate [3,4], Green tea [5,6], Apple [7], and Chamomile [12,13]. Chamomile which demonstrated no any significant physiological effect in our study, is reported to have stabilized blood pressure [13] and reduced pulse [14].…”

Section: Discussioncontrasting

confidence: 40%

“…Strawberry is reported to have reduced nausea and vomiting [1], and ginger has led to pain relief [2]. Chocolate improved relaxation [3,4] and shaded white tea demonstrated improved task performance and enhanced positive mood [5,6]. With regard to the physiological impacts, reduced EEG theta activity with apple [7], reduced sympathetic nervous system (SNS) activity and increased in parasympathetic nervous system (PNS) activity with cedarwood [8], and decreased stress-related hormones with musk [9,10] are reported.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, their outcomes might be affected by olfactory fatigue. Examples include perfumer's paper strips [3], cups or vials containing the odourants [5,7], aroma stones [13], impregnated materials worn by the participants [15] and aroma lamps [14] or electric dispensers [11] used to diffuse the odours in the ambient environment. Meanwhile, only a limited evidence is reported so far for the use of well-controlled administration techniques such as olfactometers [8,16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Psychophysiological Effects of Aroma Inhalation during a Short-term Cognitive Stressor: A Preliminary Study using Eight Different Aromas

Lekamge

Nakachi

Sato

et al. 2017

IJAE

View full text Add to dashboard Cite

Abstract:We investigated the psychophysiological effects of eight different aromas under a short-term stressor, in a within-subject experiment using an olfactometer. In this preliminary study, 6 male university students performed a 30-min calculation task under the aroma conditions: Chocolate, Strawberry, Green tea, Apple, Citrus ginger, Chamomile, Cedarwood, Musk or dipropylene glycol (control). Each aroma was intermittently delivered using a proprietary olfactometer on separate experiment days. Along with a visual analogue scale for psychological assessment, skin conductance level and electrocardiograms were recorded throughout the experiment. The increase/decrease in heart rate and high-frequency component of heart rate variability during the task were inhibited by Cedarwood, Strawberry, Green tea, Apple, and Citrus ginger, demonstrating inhibitory effects on cardiac sympathetic nervous system elevation and parasympathetic nervous system suppression. While identifying some prominent aromas for further research, the study revealed a stimulus-specific nature of aroma which led to discrepant psychophysiological effects.

show abstract

Section: Discussioncontrasting

confidence: 40%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Psychophysiological Effects of Aroma Inhalation during a Short-term Cognitive Stressor: A Preliminary Study using Eight Different Aromas

Lekamge

Nakachi

Sato

et al. 2017

IJAE

View full text Add to dashboard Cite

show abstract

“…We presume that this TMD score decrease came from the influence of the odor of the green tea. Our previous study showed that smelling shaded white tea increased the band power of alpha and beta in the frontal and occipital regions and suppressed the decrease of Vigor-Activity in POMS after mental tasks [31]. The mechanism might be that one of the main odor components of green tea stimulated the release of dopamine, which regulates brain functions, mood and attention in rats, and induced changes of event-related potential P-300 and perceived pleasure in human studies [32,33].…”

Section: Discussionmentioning

confidence: 99%

Intake of green tea inhibited increase of salivary chromogranin A after mental task stress loads

Yoto

Murao

Nakamura

et al. 2014

J Physiol Anthropol

Self Cite

View full text Add to dashboard Cite

BackgroundGreen tea has become renowned for its health benefits. In this study, we investigated the anti-stress effect of two kinds of green tea against a mental stress task load.MethodsWarm water, ordinary green tea (Sagara), and shaded white tea, which contains more amino acid components than Sagara, were used as test samples in a randomized cross-over design study. Eighteen students (nine male and nine female) participated in three experimental trials on different days at intervals of seven days. Saliva was collected before beverage intake and after performing the mental stress load tasks. Concentration of chromogranin A (CgA) in the saliva was used as an index of autonomic nervous system activity.ResultsCgA level increased after the mental tasks, but intake of green tea inhibited this increase; the anti-stress effect was even greater after consumption of shaded white tea. Intake of shaded white tea also lowered Total Mood Disturbance (TMD) score on the Profile of Mood States (POMS); subjects in this condition tended to perform more calculations in the arithmetic task than those in the warm water treatment condition.ConclusionsSalivary CgA concentration levels increased after mental stress load tasks, but ingestion of green tea inhibited this increase. This anti-stress effect was larger after the consumption of shaded white tea than after Sagara. Shaded white tea intake also lowered TMD score (POMS) and tended to improve performance on an arithmetic task compared to warm water, suggesting that shaded white tea might also improve mood during and after mental stress load.

show abstract

“…In our previous paper, smelling green tea showed an increase of the subjective rating about relaxed feeling and a less decrease in vigor score after stress loads, and electroencephalographic (EEG) activities changed after smelling green tea, suggesting that smelling green tea may have anti-stress effects. The more, different types of green tea, depending on how they were processed, not only showed their different effects on the mood, but also on EEG activity and task performance [11]. We found that smelling the Shaded white tea induced a more positive emotion, and affected EEG activity and task performance more than the normal green tea did.…”

Section: Introductionmentioning

confidence: 63%

Effect of Smelling Green Tea Rich in Aroma Components on EEG Activity and Memory Task Performance

Yoto

Moriyama

Yokogoshi

et al. 2014

IJAE

Self Cite

View full text Add to dashboard Cite

We investigated the memory task performance and the central nervous activity after smelling two kinds of pan-fired Japanese green tea to examine their physical and psychological effects. Twenty eight subjects participated in this study. We used Koushun and Kouju for test samples, which were made by different manufacturing processes. After smelling each odor sample, a memory task and an arithmetic task were used to test mental stress. Electroencephalogram (EEG) was recorded before and after smelling the test samples, and EEG activity was estimated for 4 frequency bands (alpha 1, alpha 2, beta 1 and beta 2). The profiles of mood states (POMS) and the visual analog scale (VAS) after mental stress task were completed for subjective assessments. The results showed that the odor of Kouju may induce a positive emotion. It may also affect the EEG band power of beta 1 at right frontal region and improve memory task performance.

show abstract

Effect of Smelling Green Tea on Mental Status and EEG Activity

Cited by 29 publications

References 8 publications

Psychophysiological Effects of Aroma Inhalation during a Short-term Cognitive Stressor: A Preliminary Study using Eight Different Aromas

Psychophysiological Effects of Aroma Inhalation during a Short-term Cognitive Stressor: A Preliminary Study using Eight Different Aromas

Intake of green tea inhibited increase of salivary chromogranin A after mental task stress loads

Effect of Smelling Green Tea Rich in Aroma Components on EEG Activity and Memory Task Performance

Contact Info

Product

Resources

About