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

Abstract

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.

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

“…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].…”

“…Green tea demonstrated inhibitory effects on cardiac ANS response. Demonstrating similar effects through endocrinological stress response, green tea inhibited the increase of salivary CgA [6]. Strawberry and Citrus ginger also showed positive physiological effects through inhibiting cardiac ANS response.…”

“…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.…”

Associação da cromogranina A e da amilase salivar com a ansiedade e o estresse de profissionais de enfermagem hospitalar

“…Suas medições salivares simples podem ser úteis como uma avaliação objetiva do estresse da pessoa (KANEKO et al, 2017;. Além disso, a atividade desta proteína é passível de aumentar durante as tarefas de cargas estressoras e em situações ansiogênicas, demonstrando sua possível candidatura como biomarcador de curto prazo da carga mental (NOMURA et al, 2010;WAGNER et al, 2010;YOTO et al, 2014).…”

“…Estudo realizado no Japão apontou associação significativa dos níveis de CgA com situações estressantes de estudantes de enfermagem (TAKATSUJI et al, 2008). Outros estudos demonstraram que houve um aumento da atividade desta proteína durante tarefas de cargas estressoras e em situações ansiogênicas (WAGNER et al, 2010;YOTO et al, 2014). Estes estudos sinalizam que a CgA pode ser um biomarcador para diagnosticar doenças mentais em várias populações, entre elas a de trabalhadores de enfermagem.…”