Financiado en parte por ITO EN
Effect of fluid replacement with green tea on body fluid balance and renal responses under mild thermal hypohydration: a randomized crossover study
Takamata A, Oka A, Nagata M, Kosugi N, Eguchi S, Sakagawa N, Takahashi A, Nishimoto Y, Nishimaki M, Morimoto K, Takihara T
European journal of nutrition · 2 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiado por la industria
- Gobierno
- Japan Society for the Promotion of Science
- Universidad u hospital
- Nara Women's University
- Empresa
- ITO EN
- Subvenciones
- Japan Society for the Promotion of Science (22K11593)
Según 3 financiadores declarados.
Publicación
- Publicado
- 2023-08-18 · Eur J Nutr · vol. 62 · número 8 · págs. 3339–3347
- Editorial
- Springer Science+Business Media
- Citado
- 1 cita · más que el 47% de estudios similares · 0.1× el promedio de su campo
- Referencias
- 37 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Coffee research and impacts · Exercise and Physiological Responses
- Palabras clave
- green tea, caffeine, rehydration, fluid balance, urine output, urine osmolality, fluid retention, heat illness prevention, exercise-induced dehydration, sodium and potassium excretion
- MeSH
- humans, dehydration, body weight, water, caffeine, cross-over studies, water-electrolyte balance, tea
11 autores
- Akira Takamata🇯🇵 · autor de correspondenciaNara Women's University
- Ayano Oka🇯🇵Nara Women's University
- Mayuna Nagata🇯🇵Nara Women's University
- Natsumi Kosugi🇯🇵Nara Women's University
- Sayaka Eguchi🇯🇵Nara Women's University
- Nanako Sakagawa🇯🇵Nara Women's University
- Aoi Takahashi🇯🇵Nara Women's University
- Yuki Nishimoto🇯🇵Nara Women's University
- Mio Nishimaki🇯🇵Nara Women's University
- Keiko Morimoto🇯🇵Kyoto Koka Women's University; Nara Women's University
- Takanobu Takihara🇯🇵ITO EN, Ltd. (Japan)
Resumen
El texto original del estudio, en el idioma en que se publicó.
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.
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