title: Postexercise rehydration: potassium-rich drinks versus water and a sports drink.
abstract: Fluid retention, thirst quenching, tolerance, and palatability of different drinks were assessed. On 4 different days, 12 healthy, physically active volunteers (24.4 ± 3.2 years old, 74.75 ± 11.36 kg body mass (mean ± S.D)), were dehydrated to 2.10% ± 0.24% body mass by exercising in an environmental chamber (32.0 ± 0.4 °C dry bulb, 53.8 ± 5.2% relative humidity). Each day they drank 1 of 4 beverages in random order: fresh coconut water (FCW), bottled water (W), sports drink (SD), or potassium-rich drink (NEW); volume was 120% of weight loss. Urine was collected and perceptions self-reported for 3 h. Urine output was higher (p < 0.05) for W (894 ± 178 mL) than SD (605 ± 297 mL) and NEW (599 ± 254 mL). FCW (686 ± 250 mL) was not different from any other drink (p > 0.05). Fluid retention was higher for SD than W (68.2% ± 13.0% vs. 51.3% ± 12.6%, p = 0.013), but not for FCW and NEW (62.5% ± 15.4% and 65.9% ± 15.4%, p > 0.05). All beverages were palatable and well tolerated; none maintained a positive net fluid balance after 3 h, but deficit was greater in W versus SD (p = 0.001). FCW scored higher for sweetness (p = 0.03). Thirst increased immediately after exercise but returned to baseline after drinking a small volume (p < 0.0005). In conclusion, additional potassium in FCW and NEW did not result in additional rehydration benefits over those already found in a conventional sports drink with sodium.
authors.affiliation: Human Movement Science Research Center, Escuela de Educación Física y Deportes, University of Costa Rica,11-501-2060, Montes de Oca, San José, Costa Rica.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Pérez-Idárraga
authors.forename: Luis Fernando
authors.initials: LF
authors.lastname: Aragón-Vargas
mesh_terms: D001628:Beverages; D003059:Cocos; D015444:Exercise; D005260:Female; D005440:Fluid Therapy; D006801:Humans; D008297:Male; D011188:Potassium / Q000008:administration & dosage*; D013894:Thirst; D014867:Water; D055815:Young Adult
chemical_list: D014867:Water; D011188:Potassium
keywords: coconut water; dehydration; déshydratation; eau de coco; exercice physique; exercise; palatability; palatabilité; recovery; récupération; tolerance; tolérance; urine output; urine évacuée