Hinton Tina, Jelinek Herbert F, Viengkhou Vincent, Johnston Graham A, Matthews Slade
Pharmacology, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia.
Clinical Medicine, Macquarie University, Sydney, NSW, Australia.
Front Nutr. 2019 Mar 26;6:27. doi: 10.3389/fnut.2019.00027. eCollection 2019.
GABA-containing tea has gained popularity as an accessible intervention to reduce the impact of chronic stress-induced autonomic imbalance and increased risk for cardiovascular disease despite a lack of evidence concerning the γ-aminobutyric acid (GABA) content in a cup of the tea and its effects on physiological and psychological stress as measures of cognitive function. We aimed to measure the effects of GABA-fortified tea consumption on heart rate variability (HRV) and stress in 30 participants using a pre-post cohort study design. Ten minute lead II ECG recordings were analyzed with Kubios software. Frequency domain parameters including total power, high and low frequency power, along with heart rate, were determined. A control group that consumed a non-fortified tea was included in the research. Statistical analysis was by two-way ANOVA for two-group comparison with time as an interaction and a significance level of < 0.05. Oolong tea consumption led to a significant decrease in the immediate stress score and a significant improvement in HRV. We conclude that autonomic imbalance and HRV in people with acute stress is significantly reduced following a cup of GABA fortified oolong tea and highlights the complex interaction between autonomic nervous system function and mood.
尽管缺乏关于一杯茶中γ-氨基丁酸（GABA）含量及其对作为认知功能指标的生理和心理压力影响的证据，但含GABA的茶作为一种可减轻慢性应激引起的自主神经失衡和心血管疾病风险增加影响的便捷干预措施，已受到欢迎。我们旨在采用前后队列研究设计，测量30名参与者饮用强化GABA茶对心率变异性（HRV）和压力的影响。使用Kubios软件分析10分钟的II导联心电图记录。确定了包括总功率、高频和低频功率以及心率在内的频域参数。研究中纳入了饮用非强化茶的对照组。采用双向方差分析进行两组比较，时间作为交互因素，显著性水平<0.05。饮用乌龙茶导致即时压力评分显著降低，HRV显著改善。我们得出结论，一杯强化GABA的乌龙茶后，急性应激人群的自主神经失衡和HRV显著降低，突出了自主神经系统功能与情绪之间的复杂相互作用。
