I think a very important experiment reported in 1970 by Robert Macey at U.C. Berkeley, showed that red cells which are osmotically very active, shrink in hypertonic solutions, swell in hypotonic solutions, in milliseconds. (scientificamerican.com)
• Hypotonic drinks contain less glucose than body fluids — less than 4 g of glucose / 100 ml. (personaltraining4u.net)
As Mizone's hypotonic formulation has proven faster hydration + and one third less sugar ^, it's a great «better for you» option for those craving a lower sugar sports drink. (frucorsuntory.com)