Abstract
BackgroundGrowing attention has been paid to the effects of food flavor components on alleviating negative brain functions caused by stressful lifestyles. In this study, we investigated the alleviating effect of two kinds of black tea aromas on physical and psychological stress induced by the Uchida-Kraepelin test, based on salivary chromogranin-A (CgA) levels as a stress marker and subjective evaluations (Profile of Mood States).ResultsCompared with the water exposure control, inhaling black tea aroma (Darjeeling and Assam in this study) induced lower salivary CgA concentration levels after 30 min of mental stress load tasks. This anti-stress effect of black tea aroma did not differ between the two tea types even though the concentration of the anti-stress components in the Darjeeling tea aroma was higher than that in the Assam aroma. However, Darjeeling tea aroma tended to decrease the tension and/or anxiety score immediately after the first exposure.ConclusionsInhaling black tea aroma may diminish stress levels caused by arithmetic mental stress tasks, and Darjeeling tea aroma tended to improve mood before mental stress load.
Highlights
Growing attention has been paid to the effects of food flavor components on alleviating negative brain functions caused by stressful lifestyles
visual analogue scale (VAS) VAS scores taken immediately after the first odor inhalation showed that feelings regarding the aroma samples were different among the three inhalation conditions, as measured by Friedman tests (χ2(2) = − 15.400, 28.000, 22.057, 14.111, P = 0.000, 0.000, 0.000, 0.001)
Wilcoxon signed-rank tests indicated that the inhalation of Darjeeling tea aroma tended to decrease the tension and/or anxiety (TA) score compared with the water condition (Fig. 3, Z = − 2.155, P < 0.1/3)
Summary
Growing attention has been paid to the effects of food flavor components on alleviating negative brain functions caused by stressful lifestyles. We investigated the alleviating effect of two kinds of black tea aromas on physical and psychological stress induced by the Uchida-Kraepelin test, based on salivary chromogranin-A (CgA) levels as a stress marker and subjective evaluations (Profile of Mood States). Tea consumption beneficially affects mood and attention, such as improving relaxation and concentration, reducing tiredness and psychological distress, increasing work performance, and so on [1,2,3,4,5]. Aroma has been reported as one of the functional tea components affecting the central nervous system (CNS) and autonomic nervous system (ANS). There is no literature available comparing the anti-stress effects of different black tea aroma samples on ANS activities
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