I also have an 8 year old salt waster who is very active in sports-I have not heard anything about double-dosing before hot soccer games,etc, but I do feel that she is more drained than the other players. I had talked to my endo years back about her stamina and she changed her dose a little. She has dreams of becoming a pro soccer or basketball player, but I have been told we will be lucky to have her reach 5 feet. But for now its such fun for her. I am going to ask my doctor about the doubling-does anyone know any athletes who are CAH?