What is the threshold called at which the lactic acid system is exhausted and the aerobic system takes over?

What is the threshold called at which the lactic acid system is exhausted and the aerobic system takes over?

• A. Lactate threshold
• B. Anaerobic glycolytic / aerobic threshold
• C. VO2 max threshold
• D. Max glycolytic threshold

Answer: (B)

The important idea is the point where energy supply moves from anaerobic glycolysis to the aerobic system as exercise intensity climbs. When you start, the aerobic system handles most of the work, but as demands rise, anaerobic glycolysis kicks in and lactate is produced. The threshold where that anaerobic glycolytic contribution can no longer meet the pace and the aerobic system takes over describes a clear switch between the two systems. This is best captured by the term that explicitly names the transition between anaerobic glycolysis and aerobic metabolism—the anaerobic glycolytic / aerobic threshold. While lactate threshold is related, the phrasing here emphasizes the metabolic handover from one system to the other.

The important idea is the point where energy supply moves from anaerobic glycolysis to the aerobic system as exercise intensity climbs. When you start, the aerobic system handles most of the work, but as demands rise, anaerobic glycolysis kicks in and lactate is produced. The threshold where that anaerobic glycolytic contribution can no longer meet the pace and the aerobic system takes over describes a clear switch between the two systems. This is best captured by the term that explicitly names the transition between anaerobic glycolysis and aerobic metabolism—the anaerobic glycolytic / aerobic threshold. While lactate threshold is related, the phrasing here emphasizes the metabolic handover from one system to the other.