用绿茶补充液体对体液平衡和在温和热低下脏反应的影响:一项随机交叉研究
Akira Takamata1, Ayano Oka2, Mayuna Nagata2
1Department of Environmental Health, Nara Women's University, Nara, Japan. takamata@cc.nara-wu.ac.jp.
European journal of nutrition
|August 18, 2023
概括
绿茶 (GT) 和含咖啡因的水不会使轻度脱水的人的水分水平恶化. 这些饮料有效地减少了急性恢复的负流体平衡,挑战了以前关于咖啡因的假设.
科学领域:
- 运动生理学 运动生理学
- 运动营养 运动营养
- 环境健康 环境健康
背景情况:
- 保持水分是预防炎热环境中与热量相关的疾病的关键.
- 咖啡因含有咖啡因的饮料,如绿茶 (GT),由于假设的利尿作用,历史上一直避免进行补水.
- 有限的数据存在于咖啡因对脱水个体尿液输出的影响.
研究的目的:
- 为了研究用绿茶 (GT) 代替液体对身体液体平衡的影响.
- 为了检查在轻度脱水和用GT.再水后的水和电解质处理.
- 评估咖啡因摄入对脱水个体水分状态的影响.
主要方法:
- 参与者接受了脱水方案,包括步行运动.
- 通过摄入等量的水 (H2O),绿茶 (GT) 或含咖啡因的水 (Caf-H2O) 来补偿流体损失.
- 在摄入后2小时内测量了液体平衡,尿量和电解质分泌量.
主要成果:
- 轻微的低化 (大约. 1%的体重减轻) 被诱导.
- 液体保留比率在H2O,GT和Caf-H2O试验之间没有显著差异 (分别为52.2%,51.0%,47.9%).
- 尿液输出和电解质分泌在所有液体替换条件下都保持了可比性.
结论:
- 摄入绿茶或相当剂量的咖啡因在2小时内不会影响水分状态.
- GT和含咖啡因的饮料可以有效地治疗轻度缺水症的急性恢复.
- 这些发现挑战了咖啡因在补水过程中对液体平衡产生负面影响的观点.
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