Warning: blatant advertisement....
I market this product and it has been tested over and over and here's some references to those tests:
The Physiology of Human-Powered Flight. Weiss. Science News 1990;137:140.
The Effects of Sodium: Carbohydrate (Na: Carb) Ratios in Rehydration beverages (RB) on Plasma (PG), Osmolality (PO), Volume (PV), and Subject Tolerance (ST). FASEB J 1990;4:A381 (abstract).
The Daedalus Project: Physiological Problems and Solutions. Nadel, Bussolari. Am Scientist 1988:76:351-60.
Glucose-Electrolyte Ingestion: Influence on Endurance Factors in Highly Trained Female Cyclists. Sirotniak, Foster. Med Sci Sports Exer Suppl 1992;24:S121 (abstract).
Vascular Uptake of Rehydration Fluids in Hypohydrated Men at Rest and Exercise. Greenleaf, Geelen, Jackson et al. NASA Technical Memorandum 1992:1039-42.
Vascular Uptake of Rehydration Fluids in Resting Hypohydrated Men. Greenleaf, Geelen, Saumet et al. FASEB J 1991;5:A1147 (abstract).
Hypervolemia in Men from Drinking Hyperhydration Fluids at Rest and During Exercise. Greenleaf, Looft-Wilson,Wisherd et al. NASA Technical Memorandum 1994:46-57.
Drink Composition and Cycle-Ergometer Endurance in Men: Carbohydrate, Na+, Osmolality. Greenleaf, Looft-Wilson, Wisherd et al. NASA Technical Memorandum 1994:46-50.
CD4+/CD8+ T-Lymphocyte Ratio: Effects of Rehydration Before Exercise in Dehydrated Men. Greenleaf, Jackson, Lawless. Med Sci Sports Exer 1995;27:194-9.
Drinking-Induced Plasma Vasopressin and Norepinephrine Changes in Dehydrated Humans. Geelen, Greenleaf, Keil. J Clin Endocrinol Metab 1996;81:2131-35.
Hypervolemia in Men from Fluid Ingestion at Rest and During Exercise. Greenleaf, Looft-Wilson, Wisherd et al. Aviat Space Environ Med 1998;69:374-86.
The most popular known use of this product was for the bicycle-powered Daedalus flight from Crete to Santorin over the Agean sea, about 74 miles without stopping. The product with some variation is also used by astronauts to prevent reentry problems.
Pool doesn't require that much endurance (usually!) but maybe this might help some. PM me if interested.
Jeff Livingston