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最終更新日：2025/08/05
西牧 未央
ニシマキ ミオ
(Mio Nishimaki)
論文
- タイトル
- タイトル（英）
- Effect of fluid replacement with green tea on body fluid balance and renal responses under mild thermal hypohydration: a randomized crossover study.
- 参照URL
- https://researchmap.jp/mionishimaki/published_papers/43150866
- 著者
- 著者（英）
- Akira Takamata,Ayano Oka,Mayuna Nagata,Natsumi Kosugi,Sayaka Eguchi,Nanako Sakagawa,Aoi Takahashi,Yuki Nishimoto,Mio Nishimaki,Keiko Morimoto,Takanobu Takihara
- 担当区分
- 概要
- 概要（英）
- PURPOSE: Maintaining an appropriate hydration level by ingesting fluid in a hot environment is a measure to prevent heat-related illness. Caffeine-containing beverages, including green tea (GT), have been avoided as inappropriate rehydration beverages to prevent heat-related illness because caffeine has been assumed to exert diuretic/natriuretic action. However, the influence of caffeine intake on urine output in dehydrated individuals is not well documented. The aim of the present study was to examine the effect of fluid replacement with GT on body fluid balance and renal water and electrolyte handling in mildly dehydrated individuals. METHODS: Subjects were dehydrated by performing three bouts of stepping exercise for 20 min separated by 10 min of rest. They were asked to ingest an amount of water (H2O), GT, or caffeinated H2O (20 mg/100 ml; Caf-H2O) that was equal to the volume of fluid loss during the dehydration protocol; fluid balance was measured for 2 h after fluid ingestion. RESULTS: The dehydration protocol induced hypohydration by ~ 10 g/kg body weight (~ 1% of body weight). Fluid balance 2 h after fluid ingestion was significantly less negative in all trials, and the fluid retention ratio was 52.2 ± 4.2% with H2O, 51.0 ± 5.0% with GT, and 47.9 ± 6.2% with Caf-H2O; those values did not differ among the trials. After rehydration, urine output, urine osmolality, and urinary excretions of osmotically active substances, sodium, potassium and chloride were not different among the trials. CONCLUSION: The data indicate that ingestion of GT or an equivalent caffeine amount does not worsen the hydration level 2 h after ingestion and can be effective in reducing the negative fluid balance for acute recovery from mild hypohydration. TRIAL REGISTRATION: ISRCTN53057185; retrospectively registered.
- 出版者・発行元
- 出版者・発行元（英）
- 誌名
- 誌名（英）
- European journal of nutrition
- 巻
- 号
- 開始ページ
- 終了ページ
- 出版年月
- 2023年8月18日
- 査読の有無
- 査読有り
- 招待の有無
- 掲載種別
- 研究論文（学術雑誌）
- ISSN
- DOI URL
- https://doi.org/10.1007/s00394-023-03236-3
- 共同研究・競争的資金等の研究課題