What are the three energy systems utilized in physical activity?

The three energy systems utilized in physical activity are best described as ATP/Creatine-Phosphate, Glycolysis, and Aerobic Oxidation. These systems work in concert to provide energy for muscular contraction during various types of physical activity.

The ATP/Creatine-Phosphate system is the quickest energy system and provides immediate energy for short bursts of intense activity, typically lasting for about 10 seconds. This is crucial for activities like sprinting or heavy lifting where immediate energy is needed.

Glycolysis, which is the process of breaking down glucose for energy, supports moderate to high intensity exercise that lasts longer than what the phosphagen system can support. It provides energy for activities that last from approximately 10 seconds to 2 minutes.

Lastly, aerobic oxidation is the most prolonged energy system, utilizing oxygen to produce energy from carbohydrates and fats for lower-intensity, long-duration activities. This system is vital for endurance sports such as distance running or cycling where energy needs to be sustained over many minutes or hours.

In contrast, the other options either mix up energy systems with training modalities, or reference components of metabolic pathways without accurately reflecting the primary energy systems utilized during physical activity. Therefore, the identification of the three main energy systems as ATP/