Comparison of coconut water and a carbohydrate-electrolyte sport drink on measures of hydration and physical performance in exercise-trained men

Abstract

BackgroundSport drinks are ubiquitous within the recreational and competitive fitness and sporting world. Most are manufactured and artificially flavored carbohydrate-electrolyte beverages. Recently, attention has been given to coconut water, a natural alternative to manufactured sport drinks, with initial evidence indicating efficacy with regard to maintaining hydration. We compared coconut water and a carbohydrate-electrolyte sport drink on measures of hydration and physical performance in exercise-trained men.MethodsFollowing a 60-minute bout of dehydrating treadmill exercise, 12 exercise-trained men (26.6 ± 5.7 yrs) received bottled water (BW), pure coconut water (VitaCoco®: CW), coconut water from concentrate (CWC), or a carbohydrate-electrolyte sport drink (SD) [a fluid amount based on body mass loss during the dehydrating exercise] on four occasions (separated by at least 5 days) in a random order, single blind (subject and not investigators), cross-over design. Hydration status (body mass, fluid retention, plasma osmolality, urine specific gravity) and performance (treadmill time to exhaustion; assessed after rehydration) were determined during the recovery period. Subjective measures of thirst, bloatedness, refreshed, stomach upset, and tiredness were also determined using a 5-point visual analog scale.ResultsSubjects lost approximately 1.7 kg (~2% of body mass) during the dehydrating exercise and regained this amount in a relatively similar manner following consumption of all conditions. No differences were noted between coconut water (CW or CWC) and SD for any measures of fluid retention (p > 0.05). Regarding exercise performance, no significant difference (p > 0.05) was noted between BW (11.9 ± 5.9 min), CW (12.3 ± 5.8 min), CWC (11.9 ± 6.0 min), and SD (12.8 ± 4.9 min). In general, subjects reported feeling more bloated and experienced greater stomach upset with the CW and CWC conditions.ConclusionAll tested beverages are capable of promoting rehydration and supporting subsequent exercise. Little difference is noted between the four tested conditions with regard to markers of hydration or exercise performance in a sample of young, healthy men. Additional study inclusive of a more demanding dehydration protocol, as well as a time trial test as the measure of exercise performance, may more specifically determine the efficacy of these beverages on enhancing hydration and performance following dehydrating exercise.

Kurzdarstellung

“…Geben Sie Personen mit einem einfachen anstrengungsbedingten Flüssigkeitsmangel Rehydrationsgetränke mit 3-8 % Kohlenhydrat-Elektrolyt-Anteilen (CE) [856][857][858][859][860][861][862][863][864]. Als vertretbare Alternativen können unter anderem Wasser, 12 %-CE-Lösungen [856], Kokosnusswasser [857,863,864], Milch mit 2 % Fettanteil [861] oder Tee, wahlweise mit oder ohne zusätzlichem Kohlenhydrat-Elektrolyt-Anteil, als Getränk angeboten werden [858,865]. In Fällen eines schweren Flüssigkeitsmangels in Verbindung mit einem niedrigen Blutdruck, Fieber oder einem eingeschränkten Bewusstseinszustand kann eine orale Flüssigkeitsgabe nicht adäquat sein.…”

Impacto Da Reposição Hídrica Com Água De Coco Sobre O Estado De Hidratação E Cardiovascular Drift Durante O Exercício

“…Por outro lado, Noakes 34 destaca que não há evidências científicas suficientes para recomendações de tais bebidas esportivas, o que existe na verdade é um grande interesse comercial por parte das indústrias que as fabricam. É possível que a água de coco possa proporcionar efeitos hidratantes semelhantes aos de bebidas esportivas, com carboidratos e eletrólitos na prática de exercícios 11 . Por outro lado, no presente trabalho,realizado em condições termoneutras, o cardiovascular drift não ocorreu nos grupos que ingeriram líquidos, independentemente da sua qualidade (água de coco ou água pura),quando comparado com o grupo que não ingeriu.…”

“…Além disso, formas distintas de reposição hídrica podem ser utilizadas para evitar a desidratação, tal como o consumo da água de coco 10 . A água de coco, além de ter agradável paladar, é considerada um excelente repositor energético e eletrolítico natural, devido a sua composição (carboidrato, sódio, potássio e cloreto), comparada a outras bebidas esportivas comerciais 10,11 . Tal propriedade tem gerado o interesse comercial e científico deste recurso hídrico, como uma bebida esportiva natural, proporcionando benefícios a hidratação 10 .…”

PENGARUH PROSES M EMBRAN U LTRAFILTRASI DAN ULTRAVIOLET TERHADAP KOMPOSISI GIZI, SIFAT FISIKOKIMIA DAN ORGANOLEPTIK MINUMAN AIR KELAPA / The Effects of Ultrafiltration and Ultraviolet Process on Nutritional Composition, Physicochemical and Organoleptic

“…Kandungan berbagai komponen aktif membuat air kelapa memiliki sifat-sifat protektif bagi kesehatan, seperti kardioprotektif, antihipertensi, hipoglikemik dan antioksidan yang terbukti dari hasil berbagai penelitian terhadap hewan uji (BAKARE et al, 2014;BHAGYA et al, 2010;PRATHAPAN dan RAJAMOHAN, 2011;PREETHA et al, 2012). Selain itu, air kelapa menunjukkan indeks rehidrasi (BAHRI et al, 2012;KALMAN et al, 2012) yang sangat baik jika digunakan sebagai pengganti cairan tubuh setelah berolahraga. Karakteristik air kelapa yang khas dan enak karena mengandung karbohidrat dan elektrolit juga dapat memberikan keuntungan tersendiri karena menstimulasi keinginan untuk minum lebih banyak cairan dan menghasilkan hidrasi yang lebih adekuat pada orang yang aktif berolahraga (PEACOCK et al, 2012).…”