The third and fourth visits were the crossover portion of the experiment comparing MFGM to the vehicle. The 3rd and 4th visits were identical to the 2nd visit except participants drank either the fluid replacement vehicle or fluid replacement + MFGM 1 hr before the exercise challenge and again immediately following the exercise. Participants and personnel administering experimental protocols were blinded to treatments by use of coded, non-transparent drink containers. Subjects complete the 4th visit one week later and consume the vehicle beverage or the vehicle + MFGM.