Effects of three-week intake of Matcha green tea powder on heart rate variability metrics

Mark Elisabeth Theodorus Willems, Cameron Thomas Foster
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Abstract

Introduction: Compared to other green teas, higher intake of multiple phytochemicals is achieved with Matcha green tea consumption. Green tea consumption is known to have metabolic effects but is also consumed for supposed calming effects. The aim of the present study was to examine the effects of encapsulated Matcha green tea on heart rate variability metrics during supine rest, as well as on physiological and metabolic responses during both supine rest and moderate-intensity exercise. Methods: Healthy females (n=8, age: 22±3 yrs, body mass: 68±11 kg, height: 162±5 cm) volunteered. The study employed a placebo-controlled, randomised cross-over design. Time-domain heart rate variability metrics during supine rest (n=5) and physiological and metabolic responses using indirect calorimetry techniques during supine rest and 60-min of moderate-intensity (~ 4-METs) treadmill walking (speed: 4.4±0.5 km·h-1) were measured following 3 weeks of 3 g·day-1 of Matcha green tea or placebo. Results: During supine rest with Matcha green tea, all participants had lower heart rates by 13±7% (P=0.01, d= -1.45), higher mean beat-to-beat RR intervals by 16±9% (P=0.03, d=1.25), higher SDNN by 44±32% (P=0.01, d=0.76) and higher pNN50 by 139±139% (P<0.01, d=1.28). Matcha green tea had no effects on the physiological and metabolic responses during supine rest and moderate-intensity treadmill walking (e.g. respiratory exchange ratio, placebo: 0.78±0.04; Matcha: 0.78±0.03, P=0.87). Fat oxidation during supine rest was correlated (r=0.75, P<0.01) with the moderate-intensity walking induced fat oxidation. Conclusions: In young adult healthy females, Matcha green tea beneficially effects heart rate variability metrics during supine rest indicating an alteration in parasympathetic nervous activity and therefore suggestive of a relaxing effect. Matcha green tea did not change the metabolic responses during supine rest and exercise possibly due to the low respiratory exchange ratio in the female cohort. Future work should address the effectiveness of Matcha green tea during conditions of psychological stress.Keywords: Matcha green tea, heart rate variability, rest, walking, substrate oxidation 
连续三周摄入抹茶绿茶粉对心率变异性指标的影响
介绍:与其他绿茶相比,饮用抹茶能摄入更多的多种植物化学物质。众所周知,饮用绿茶具有促进新陈代谢的作用,但饮用绿茶也会产生所谓的镇静作用。本研究旨在考察封装抹茶绿茶对仰卧休息时心率变异性指标的影响,以及对仰卧休息和中等强度运动时生理和代谢反应的影响。方法:健康女性(n=8,年龄:22±3 岁,体重:68±11 千克,身高:162±5 厘米)自愿参加。研究采用安慰剂对照、随机交叉设计。在服用抹茶绿茶 3 克-天-1 或安慰剂 3 周后,测量仰卧休息时的时域心率变异指标(n=5),以及仰卧休息和 60 分钟中等强度(~ 4-METs)跑步机行走(速度:4.4±0.5 km-h-1)时使用间接热量计技术的生理和代谢反应。结果显示在服用抹茶绿茶的仰卧休息期间,所有参与者的心率降低了13±7%(P=0.01,d=-1.45),平均搏动RR间期增加了16±9%(P=0.03,d=1.25),SDNN增加了44±32%(P=0.01,d=0.76),pNN50增加了139±139%(P<0.01,d=1.28)。抹茶绿茶对仰卧休息和中等强度跑步机行走时的生理和代谢反应没有影响(如呼吸交换比,安慰剂:0.78±0.04;抹茶:0.78±0.03,P=0.87)。仰卧休息时的脂肪氧化与中等强度步行引起的脂肪氧化相关(r=0.75,P<0.01)。结论在年轻的成年健康女性中,抹茶绿茶有益地影响了仰卧休息时的心率变异性指标,这表明副交感神经活动发生了改变,因此提示了放松效果。抹茶绿茶没有改变仰卧休息和运动时的新陈代谢反应,这可能是由于女性群体的呼吸交换比率较低。未来的工作应关注抹茶绿茶在心理压力条件下的功效:抹茶绿茶 心率变异性 休息 步行 底物氧化
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