The purpose of carbohydrate loading is to a. make protein stores available for energy. b. deplete glycogen stores. c. maximize glycogen stores. stress hormones tend to increase the metabolic needs of the body because they a. increase the use of insulin. b. "can accelerate heart rate, increase muscle tension, elevate blood pressure, cholesterol, and triglyceride levels." c. reduce the amount of glycogen stored in the muscles. which energy system has a short-lived supply of fuel and is released in high-intensity events? a. the atp-cp system b. the aerobic system c. the sprint pathway