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Assess the effects of adding theanine to a caffeinated beverage on changes in blood pressure during acute mental stress.
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Caffeine and (mental) stress can increase blood pressure. In a typical everyday and/or work environment they commonly coincide. Tea has the reputation of being a relaxing drink. L-theanine is an amino acid found almost exclusively in tea. In a previous study it was shown that caffeine increased blood pressure, while theanine antagonised these effects. In the current study the effect of theanine to a placebo on blood pressure are directly compared.
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56 participants in 2 patient groups, including a placebo group
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Data sourced from clinicaltrials.gov
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