Case: Your Aunt Mildred is a world-class distance runner. While training for the Leadville 100-mile Trail ultramarathon, Mildred would routinely complete 4-5 hour training runs. As race day approached Mildred began to "taper", gradually reducing the number of miles she was running each week. On Saturday, following a relatively easy 5-mile run, Mildred fainted and was treated on-site by first responders. They quickly determined that Mildred had a mild case of dehydration