Which type of metabolism is utilized during racing?

During racing, the primary type of metabolism utilized is anaerobic lactic metabolism. This energy system is employed when the demand for energy is immediate, exceeding the oxygen supply available for aerobic metabolism. In high-intensity activities like racing, the horse's muscles require quick bursts of energy to maintain speed and performance, and this is achieved through anaerobic lactic metabolism.

The anaerobic lactic system generates energy from glucose breakdown without the need for oxygen, leading to the production of lactic acid as a byproduct. This process allows the horse to perform at high intensity for short durations, which is characteristic of racing. The accumulation of lactic acid can eventually lead to fatigue, but it is suitable for the explosive efforts required during a race where high power output is necessary over a relatively short time period.

In contrast, aerobic metabolism depends on the presence of oxygen and is more suited to endurance events, where energy is produced over a longer duration at lower intensity. The other options, such as aerobic lactic and anaerobic alactic metabolism, do not align with the energy demands experienced during racing; they pertain to different energy pathways and durations of activity.