2.3 当火警铃响
英文是核对事实的源头。 用页顶语言切换栏在英文/繁体/简体之间跳转。
模块二 · 第 3 课/共 4 课 — 属于 2. 身体、大脑与心情。刚来?先到 模块入口 看完整章节地图。
上标数字是可点击的脚注(跳到来源,箭头跳回;悬停常会弹出摘要)。折叠的「更多详情…」方框收着荷尔蒙回路名、剂量表,以及一篇篇论文的诚实笔记,让打开的页面保持白话。
压力也有化学
大脑讯号(2.1)与脑节奏(2.2)是茶双重故事的两个窗口。这一坐打开第三个:当日子本身嘈杂时,身体里发生什么。
当你受压时,身体跑着一条化学火警回路。一个主要输出是许多人听过的压力荷尔蒙:皮质醇。另一个快速的「前进」讯号是肾上腺素。你不需要完整回路图也能跟上故事——折叠里有它。
白话带走
想象一个火警铃(真实压力),也想象一声响亮的咖啡因「助推」警报。
- 咖啡因可以推动压力化学回路,并抬高皮质醇。
- 在每日使用咖啡因时,那个由咖啡因驱动的警报往往数天内变得较安静——但真实压力的火警铃仍可以响。1
- L-茶氨酸被研究用于:在负荷加上时,帮助令心率、血压、与压力相关的酶,以及人们感觉有多受压,较接近基线。234
用日常衣装说:习惯可以令咖啡因警报变安静。它不会删掉火警铃。那正是 L-茶氨酸研究赚到席位的地方。
当你受压时,身体跑着一条常被称为 HPA 轴的回路(脑 → 垂体 → 肾上腺)。一个输出是皮质醇。另一个相关讯号是epinephrine(肾上腺素)。唾液 α-淀粉酶(sAA) 是常被用作「前进系统」标记的压力相关酶。
| 量度 | 条件 | 发现 | 来源 |
|---|---|---|---|
| 算术压力下的心率/唾液 IgA | L-茶氨酸 vs 安慰剂 | L-茶氨酸减少心率与唾液免疫—压力反应;心跳节奏模式提示较少「前进」驱动 | Kimura et al. (2007)5 |
| 心智作业下的血压/紧张—焦虑 | L-茶氨酸 vs 安慰剂 | L-茶氨酸减弱高反应成人的血压上升,并降低紧张—焦虑分数(相对安慰剂) | Yoto et al. (2012)6 |
| 压力实习期间的早晨唾液 α-淀粉酶 | 每日两次约 200 mg L-茶氨酸 vs 安慰剂 | 茶氨酸组在多日药学实习中显示较低的实习前 sAA,以及较低的主观压力 | Unno et al. (2013)7 |
| 整天的唾液皮质醇 | 控制摄入数周后的 250 mg 咖啡因挑战 | 戒断后,咖啡因有力抬高皮质醇;约 5 天每日 300–600 mg 后,早晨挑战反应变钝,但并非整天全部消失 | Lovallo et al. (2005)8 |
诚实笔记:资料包表与论文在何处分歧
有些配套资料包表把一个整齐的唾液皮质醇差值(L-茶氨酸约 ±5% vs 安慰剂约 +22%)归给 Yoto et al. (2012)。发表的 Yoto 2012 论文量的是压力下的血压与心情,不是那个皮质醇对照。9 因此这一课为血压/焦虑引用 Yoto,为心率/sIgA 引用 Kimura,为真实学生压力下的 sAA 引用 Unno,为咖啡因—皮质醇适应引用 Lovallo——并且不把错配的皮质醇归属当成事实重复。
资料包表有时也把咖啡因—皮质醇适应说成「五天内几乎消失」。Lovallo 的控制试验更精确:在每日 300 或 600 mg 五天后,早晨咖啡因挑战的皮质醇反应大致被取消,但整天稍后在进一步剂量后皮质醇仍可上升——减少,不是消除。10
血管张力。 咖啡因可以作为其想睡讯号阻挡故事的一部分,令脑血管收缩。11 L-茶氨酸在细胞工作中被显示可促进内皮细胞一氧化氮生成——「较稳血压」语言的一条可信路径。12 Yoto 的人类压力设计加上一座桥:L-茶氨酸可以在高反应者中钝化与作业相关的血压攀升。13 那是机制加试验的说法,不是家用血压处方。
在相信压力标题之前: 核对剂量、作业 vs 休息、时序,以及比较了什么——正是模块 2.2 教给脑波宣称的同一四个问题。
迷思检查:「咖啡因永久摧毁你的肾上腺」
急性咖啡因可以大幅抬高皮质醇。在每日数百毫克的使用下,那个由咖啡因驱动的尖峰往往在约五天的控制摄入内缩小——但仔细的试验说的是日常水平下不完整的安静,不是永久肾上腺摧毁,也不是总静音键。14 由压力驱动的反应仍可以上升,那正是 L-茶氨酸研究(Kimura、Yoto、Unno)赚到席位的地方。151617 关于 L-茶氨酸与压力/焦虑的系统综述保持谨慎:部分试验有效应,但剂量、场景,以及你量什么都很重要。18
通往第 4 章的桥
这条荷尔蒙线索也向前伸进第 4 章:当压力化学上升时,人们在某些实验室场景可以变成较 агре的风险追求者。压力下软化的损失厌恶,是 联结桥梁页上的桥之一。
荷尔蒙仍有点看不见。身体外面你可以看到什么?
一分钟故事
压力跑着一条朝向皮质醇与相关讯号的化学火警回路。咖啡因可以推动那条回路;习惯摄入不完全地钝化由咖啡因驱动的尖峰。L-茶氨酸被研究用于:在负荷下令心率、血压、压力酶与主观压力较接近基线。错把皮质醇数字归给 Yoto 2012 的资料包表在这里被改正:Yoto 是血压与心情;Lovallo 是咖啡因—皮质醇适应。
- 压力有化学:火警荷尔蒙故事,不只是心情词。
- 咖啡因可以抬高警报;与 L-茶氨酸相关的饮品,在引用设计里更常令标记较接近基线。
- 相信压力标题之前:剂量、作业、时序、对照(与模块 2.2 同一素养)。
脚注
Lovallo, W. R., et al. (2005). Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosomatic Medicine, 67(5), 734–739. https://doi.org/10.1097/01.psy.0000181270.20036.06↩︎
Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45. https://doi.org/10.1016/j.biopsycho.2006.06.006↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Unno, K., et al. (2013). Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress. Pharmacology Biochemistry and Behavior, 111, 128–135. https://doi.org/10.1016/j.pbb.2013.09.004↩︎
Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45. https://doi.org/10.1016/j.biopsycho.2006.06.006↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Unno, K., et al. (2013). Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress. Pharmacology Biochemistry and Behavior, 111, 128–135. https://doi.org/10.1016/j.pbb.2013.09.004↩︎
Lovallo, W. R., et al. (2005). Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosomatic Medicine, 67(5), 734–739. https://doi.org/10.1097/01.psy.0000181270.20036.06↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Lovallo, W. R., et al. (2005). Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosomatic Medicine, 67(5), 734–739. https://doi.org/10.1097/01.psy.0000181270.20036.06↩︎
Fredholm, B. B., Bättig, K., Holmén, J., Nehlig, A., & Zvartau, E. E. (1999). Actions of caffeine in the brain with special reference to factors that contribute to its widespread use. Pharmacological Reviews, 51(1), 83–133. https://pharmrev.aspetjournals.org/content/51/1/83↩︎
Siamwala, J. H., et al. (2013). L-Theanine promotes nitric oxide production in human endothelial cells via eNOS phosphorylation. Journal of Nutritional Biochemistry, 24(3), 595–605.↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Lovallo, W. R., et al. (2005). Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosomatic Medicine, 67(5), 734–739. https://doi.org/10.1097/01.psy.0000181270.20036.06↩︎
Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45. https://doi.org/10.1016/j.biopsycho.2006.06.006↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Unno, K., et al. (2013). Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress. Pharmacology Biochemistry and Behavior, 111, 128–135. https://doi.org/10.1016/j.pbb.2013.09.004↩︎
Williams, J. L., et al. (2020). The effects of green tea amino acid L-theanine consumption on the ability to manage stress and anxiety levels: A systematic review. Plant Foods for Human Nutrition, 75(1), 12–23.↩︎
Lovallo, W. R., et al. (2005). Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosomatic Medicine, 67(5), 734–739. https://doi.org/10.1097/01.psy.0000181270.20036.06↩︎
Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45. https://doi.org/10.1016/j.biopsycho.2006.06.006↩︎
Unno, K., et al. (2013). Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress. Pharmacology Biochemistry and Behavior, 111, 128–135. https://doi.org/10.1016/j.pbb.2013.09.004↩︎
Siamwala, J. H., et al. (2013). L-Theanine promotes nitric oxide production in human endothelial cells via eNOS phosphorylation. Journal of Nutritional Biochemistry, 24(3), 595–605.↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45. https://doi.org/10.1016/j.biopsycho.2006.06.006↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Unno, K., et al. (2013). Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress. Pharmacology Biochemistry and Behavior, 111, 128–135. https://doi.org/10.1016/j.pbb.2013.09.004↩︎
Lovallo, W. R., et al. (2005). Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosomatic Medicine, 67(5), 734–739. https://doi.org/10.1097/01.psy.0000181270.20036.06↩︎
Williams, J. L., et al. (2020). The effects of green tea amino acid L-theanine consumption on the ability to manage stress and anxiety levels: A systematic review. Plant Foods for Human Nutrition, 75(1), 12–23.↩︎
Lovallo, W. R., et al. (2005). Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosomatic Medicine, 67(5), 734–739. https://doi.org/10.1097/01.psy.0000181270.20036.06↩︎
Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45. https://doi.org/10.1016/j.biopsycho.2006.06.006↩︎
Yoto, A., Motoki, M., Murao, S., & Yokogoshi, H. (2012). Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. Journal of Physiological Anthropology, 31, 28. https://doi.org/10.1186/1880-6805-31-28↩︎
Unno, K., et al. (2013). Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress. Pharmacology Biochemistry and Behavior, 111, 128–135. https://doi.org/10.1016/j.pbb.2013.09.004↩︎