The primary purpose of ffr sport drinks is to replace water lost in seeat and ti provide carbohydrate ffr drink alsoprovide sodium and chloride which are the primary electrolytes in sweat as discussed in chapter 8 the greaterthe rate of sweating the higher the concentration of sodium and chloride in sweat lost from the body although relatively little potassisum is found in sweat potassaium is often added to sport drinks as discussed in 8-10 potassium is in greater concentration in intra than extracellular fluid so its concentration in swear tends to be lower that sodium and chloride how ever as for sodium and chloride higher sweat rates do result in increased loss of potassium sport drinks may include orther ingredients such as phosphorus chromium calcium magnesium iron caffeine and certain vitanins the addition of most of these substances has not been proven to acutely improve perfornance