Which type of event is characterized as primarily using the lactic energy system?

The lactic energy system, also known as the anaerobic glycolytic system, is primarily utilized during events that last from about 30 seconds to 2 minutes. This system produces energy quickly but is limited in its capacity, leading to the accumulation of lactic acid, which can cause fatigue.

The 400m event is a classic example of a race that predominantly relies on the lactic energy system due to its duration of approximately 50 to 60 seconds for elite athletes, pushing it right into the optimal range for lactic acid production. During a 400m sprint, athletes engage in high-intensity efforts that result in lactic acid buildup, hence utilizing this energy system effectively.

In contrast, shorter events like the 100m sprint heavily depend on the ATP-PC system, which provides immediate bursts of energy without the delay of lactic acid accumulation. The 200m freestyle swim, while also demanding, still allows for the use of aerobic contributions as it is longer than the 100m and shorter than the event that fully triggers lactic reliance. The 800m race walk is at the edge of aerobic and anaerobic systems but starts to shift towards aerobic metabolism due to its longer duration, often exceeding 2 minutes for many competitors