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Effects of rooibos tea, bottled water, and a carbohydrate beverage on blood and urinary measures of hydration after acute dehydration.
Res Sports Med 2010; 18(2):85-96RS

Abstract

Rooibos tea contains polyphenol antioxidants, including flavonoids and phenolic acids that are potent free radical scavengers and has purported benefits for accelerated rehydration. The objective was to evaluate the effects of three different drinks (rooibos tea, bottled water, and a carbohydrate beverage) on blood and urinary markers of hydration after acute dehydration in collegiate wrestlers. Twenty-three athletes were recruited and followed a randomized, cross-over design with three different study arms comparing the effectiveness of rooibos tea, carbohydrate beverage (6% or 60 grams l(-1)), or bottled water (placebo) in promoting rehydration after a 3% reduction in body mass. Urine specific gravity (U(sg)) urine (U(osm)) and plasma osmolarity (P(osm)), and plasma volume were measured pre- and post dehydration and at 1-h after rehydration. Statistical analyses utilized a 3 (conditions) x 3 (times) repeated measures analysis of variance to test main effects. Significant interaction effects were found for P(osm) and U(osm), both of which remained below basleline after 1-h rehydration in the rooibos tea and water trials. No significant interaction effects were found for either urine U(sg) or plasma volume shift. The findings of this study demonstrate that rooibos tea was no more effective in promoting rehydration than plain water, with significant changes being found for P(osm) and U(osm) in the carbohydrate/electrolyte solution, in collegiate wrestlers after a 3% reduction in body mass and a rehydration period of 1-h when consuming 100% of their body weight loss.

Authors+Show Affiliations

Department of Health, Leisure, and Exercise Science, Appalachian State University, Boone, North Carolina 28608, USA. utterac@appstate.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20397112

Citation

Utter, Alan C., et al. "Effects of Rooibos Tea, Bottled Water, and a Carbohydrate Beverage On Blood and Urinary Measures of Hydration After Acute Dehydration." Research in Sports Medicine (Print), vol. 18, no. 2, 2010, pp. 85-96.
Utter AC, Quindry JC, Emerenziani GP, et al. Effects of rooibos tea, bottled water, and a carbohydrate beverage on blood and urinary measures of hydration after acute dehydration. Res Sports Med. 2010;18(2):85-96.
Utter, A. C., Quindry, J. C., Emerenziani, G. P., & Valiente, J. S. (2010). Effects of rooibos tea, bottled water, and a carbohydrate beverage on blood and urinary measures of hydration after acute dehydration. Research in Sports Medicine (Print), 18(2), pp. 85-96. doi:10.1080/15438620903321102.
Utter AC, et al. Effects of Rooibos Tea, Bottled Water, and a Carbohydrate Beverage On Blood and Urinary Measures of Hydration After Acute Dehydration. Res Sports Med. 2010;18(2):85-96. PubMed PMID: 20397112.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of rooibos tea, bottled water, and a carbohydrate beverage on blood and urinary measures of hydration after acute dehydration. AU - Utter,Alan C, AU - Quindry,John C, AU - Emerenziani,Gian Pietro, AU - Valiente,J Scott, PY - 2010/4/17/entrez PY - 2010/4/17/pubmed PY - 2010/7/17/medline SP - 85 EP - 96 JF - Research in sports medicine (Print) JO - Res Sports Med VL - 18 IS - 2 N2 - Rooibos tea contains polyphenol antioxidants, including flavonoids and phenolic acids that are potent free radical scavengers and has purported benefits for accelerated rehydration. The objective was to evaluate the effects of three different drinks (rooibos tea, bottled water, and a carbohydrate beverage) on blood and urinary markers of hydration after acute dehydration in collegiate wrestlers. Twenty-three athletes were recruited and followed a randomized, cross-over design with three different study arms comparing the effectiveness of rooibos tea, carbohydrate beverage (6% or 60 grams l(-1)), or bottled water (placebo) in promoting rehydration after a 3% reduction in body mass. Urine specific gravity (U(sg)) urine (U(osm)) and plasma osmolarity (P(osm)), and plasma volume were measured pre- and post dehydration and at 1-h after rehydration. Statistical analyses utilized a 3 (conditions) x 3 (times) repeated measures analysis of variance to test main effects. Significant interaction effects were found for P(osm) and U(osm), both of which remained below basleline after 1-h rehydration in the rooibos tea and water trials. No significant interaction effects were found for either urine U(sg) or plasma volume shift. The findings of this study demonstrate that rooibos tea was no more effective in promoting rehydration than plain water, with significant changes being found for P(osm) and U(osm) in the carbohydrate/electrolyte solution, in collegiate wrestlers after a 3% reduction in body mass and a rehydration period of 1-h when consuming 100% of their body weight loss. SN - 1543-8635 UR - https://www.unboundmedicine.com/medline/citation/20397112/Effects_of_rooibos_tea_bottled_water_and_a_carbohydrate_beverage_on_blood_and_urinary_measures_of_hydration_after_acute_dehydration_ L2 - http://www.tandfonline.com/doi/full/10.1080/15438620903321102 DB - PRIME DP - Unbound Medicine ER -