Beyond total electrolyte losses, many competitive athletes also want to know about the specific breakout of those electrolytes. usatprojectpodium triathlete reesevannerson has the breakdown for you. While everyone’s sweat composition is different, Lindsay Baker of the Gatorade Sports Science Institute conducted research that found an athlete’s sweat is comprised of 47.4% sodium, 47.4% chloride and 7.4% potassium on average. nixhydration #TriWeek