Fuel consumption in someone who is doing moderate exercise below lactate threshold is derived equally metabolizes lipids and glucose for energy. Glucose metabolism provides 2/3rd of energy in someone engaged in high intensity exercise of about 85% of VO2 max. Which of the following explains these differences.?
A. When exercising below lactate threshold, glycogen stores are depoleted and lipids are used as a secondary fuel source
B. When exercising above VO2 max, ATP is produced using primarily glucose metabolism as glucose, not triglyceride, can be metabolized anaerobically.
C. When exercising intensity increases above VO2 max, glucose consumption increases because lipids are rapidly converted to glucose which are metabolized anaerobically for a rapid source of ATP