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The effect of drinking tea at high altitude on hydration status and mood.
Eur J Appl Physiol 2004; 91(4):493-8EJ

Abstract

The effect of drinking tea on hydration status and mood was studied in nine male and four female members of expeditions based at Mt. Everest base camp at an altitude of 5,345 m. Whilst exposed to altitude-cold diuresis, participants were subjected to a crossover experimental design comprising two 24-h dietary interventions. In the "tea" condition, hot brewed tea formed a major part of fluid intake, whereas in the "no-tea" condition tea was excluded from the diet. Subjects were prohibited in both cases from consuming other caffeinated beverages, caffeinated foods, and alcoholic drinks. Mean fluids ingested [mean (SE); tea=3,193 (259) ml versus no tea=3,108 (269) ml] and urine volume (tea=2,686 (276) ml versus no tea=2,625 (342) ml] were similar under both conditions. Statistical analysis found no difference in urine stimulated as a result of the tea intervention (P=0.81). Several markers of hydration status were also taken immediately pre and post each condition, including measures of urine specific gravity, urine electrolyte balance (K+, Na+), and urine colour. None of these measures indicated a difference in hydration status as a result of the dietary intervention in either the control or tea condition. A difference was, however, found in mood, with subjects reporting reduced fatigue when tea was included in the diet (P=0.005). The study shows therefore that even when drunk at high altitude where fluid balance is stressed, there is no evidence that tea acts as a diuretic when consumed through natural routes of ingestion by regular tea drinkers, but that it does have a positive effect on mood.

Authors+Show Affiliations

Colworth House, Unilever R&D Colworth, Sharnbrook, Bedford MK44 1LQ, UK. David.S.Scott@unilever.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

14872247

Citation

Scott, David, et al. "The Effect of Drinking Tea at High Altitude On Hydration Status and Mood." European Journal of Applied Physiology, vol. 91, no. 4, 2004, pp. 493-8.
Scott D, Rycroft JA, Aspen J, et al. The effect of drinking tea at high altitude on hydration status and mood. Eur J Appl Physiol. 2004;91(4):493-8.
Scott, D., Rycroft, J. A., Aspen, J., Chapman, C., & Brown, B. (2004). The effect of drinking tea at high altitude on hydration status and mood. European Journal of Applied Physiology, 91(4), pp. 493-8.
Scott D, et al. The Effect of Drinking Tea at High Altitude On Hydration Status and Mood. Eur J Appl Physiol. 2004;91(4):493-8. PubMed PMID: 14872247.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effect of drinking tea at high altitude on hydration status and mood. AU - Scott,David, AU - Rycroft,Jane A, AU - Aspen,Jennifer, AU - Chapman,Clare, AU - Brown,Bryce, Y1 - 2004/02/11/ PY - 2003/10/19/accepted PY - 2004/2/12/pubmed PY - 2004/11/5/medline PY - 2004/2/12/entrez SP - 493 EP - 8 JF - European journal of applied physiology JO - Eur. J. Appl. Physiol. VL - 91 IS - 4 N2 - The effect of drinking tea on hydration status and mood was studied in nine male and four female members of expeditions based at Mt. Everest base camp at an altitude of 5,345 m. Whilst exposed to altitude-cold diuresis, participants were subjected to a crossover experimental design comprising two 24-h dietary interventions. In the "tea" condition, hot brewed tea formed a major part of fluid intake, whereas in the "no-tea" condition tea was excluded from the diet. Subjects were prohibited in both cases from consuming other caffeinated beverages, caffeinated foods, and alcoholic drinks. Mean fluids ingested [mean (SE); tea=3,193 (259) ml versus no tea=3,108 (269) ml] and urine volume (tea=2,686 (276) ml versus no tea=2,625 (342) ml] were similar under both conditions. Statistical analysis found no difference in urine stimulated as a result of the tea intervention (P=0.81). Several markers of hydration status were also taken immediately pre and post each condition, including measures of urine specific gravity, urine electrolyte balance (K+, Na+), and urine colour. None of these measures indicated a difference in hydration status as a result of the dietary intervention in either the control or tea condition. A difference was, however, found in mood, with subjects reporting reduced fatigue when tea was included in the diet (P=0.005). The study shows therefore that even when drunk at high altitude where fluid balance is stressed, there is no evidence that tea acts as a diuretic when consumed through natural routes of ingestion by regular tea drinkers, but that it does have a positive effect on mood. SN - 1439-6319 UR - https://www.unboundmedicine.com/medline/citation/14872247/The_effect_of_drinking_tea_at_high_altitude_on_hydration_status_and_mood_ L2 - https://dx.doi.org/10.1007/s00421-003-1015-z DB - PRIME DP - Unbound Medicine ER -