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Tsukuba Business-Academia Cooperation Support Center, Agriculture, Forestry and Fisheries Research Council Secretariat of the Ministry of Agriculture, Forestry and Fisheries, Japan (MAFF) was established in 1978 as Tsukuba Office and has been planning and operating various research facilities for supporting experimental research activities of research agencies, prefectural organizations and universities. The Tsukuba Business-Academia Cooperation Support Center is currently managing two centers, Agriculture, Forestry and Fisheries Research Infor [...]

Actif (Le fournisseur de données a soumis des métadonnées au cours de la dernière année civile)
Journal Article

Article de revue

Effects of L-theanine on the release of alpha-brain waves in human volunteers  [1998]

Kobayashi, K. (Taiyo Kagaku Co. Ltd., Yokkaichi, Mie (Japan)); Nagato, Y.; Aoi, N.; Juneja, L.R.; et al.

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L-Theanine is an amino acid found in green tea leaf and in its infusion, and is known to control excitement caused by caffeine. It is also known that the oral administration of L-theanine to rats results in a decrease of serotonin and increase of catecholamines in their brain. L-Theanine has been confirmed to be safe in animal experiments. We found recently that oral intake of L-theanine caused a feeling of relaxation among the human volunteers examined. These observations led us to do experiments on the effects of administration of L-theanine on the brain electric waves. Eight female university students were selected as volunteers. Four of them were ranked to be Grade I (the highest anxiety) and the remaining four, Grade V (the lowest anxiety) in an investigation done by the manifest anxiety scale method. A dose of oral administration of 200 mg of L-theanine dissolved in 100 ml of water resulted in the generation of alpha-electric waves in the occipital and parietal regions of the brains of the subjects. The emission intensity of alpha-brain waves (integrated s a function of investigation times and area) was significantly greater inthe group of Grade I than that of Grade V. These results indicate the possibility for L-theanine to be applied to foods and beverages as a new type of functional food ingredient for its relaxation effect
(Revue
Journal of the Agricultural Chemical Society of Japan (Japan)
ISSN : 0002-1407

Information bibliographique

Langue:
Japanese
Type:
Summary
Sur AGRIS depuis:
2001
Volume:
72
Numéro:
2
Page initiale:
153
Page finale:
157
Tous les titres:
"Effects of L-theanine on the release of alpha-brain waves in human volunteers"@eng
Autre:
"Summaries (En, Ja)"
"6 fig.; 24 ref"
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Information bibliographique

Langue:
Japanese
Type:
Summary
Sur AGRIS depuis:
2001
Volume:
72
Numéro:
2
Page initiale:
153
Page finale:
157
Tous les titres:
"Effects of L-theanine on the release of alpha-brain waves in human volunteers"@eng
Autre:
"Summaries (En, Ja)"
"6 fig.; 24 ref"