Why was this study done?

Astronauts commonly experience dehydration during long flights. It is important to understand the role of rehydration formulas and their ability to prevent dehydration (maintenance of plasma volume). This study was designed to better understand the role of differing concentrations of rehydration formulas on dehydrated subjects.

What did the study find?

The study found that hydration formulas that are nearly isotonic (similar to the pH of blood) were the best at rehydration.

Vascular Uptake of Rehydration Fluids in Resting Hypohydrated Men.
Authors: Greenleaf J, et al.
FASEB J, 1991. 5(5): p. A1147.PFD Abstract: FASEB J, 1991.