What type of energy system is predominantly used in long duration, low intensity activities?

The aerobic energy system is predominantly used in long duration, low intensity activities because it relies on oxygen to produce energy. This system is capable of sustaining prolonged physical activity by metabolizing carbohydrates and fats, which allows for a continuous supply of ATP (adenosine triphosphate), the energy currency of the cell.

In the context of low-intensity exercise, such as walking, jogging, or cycling at an easy pace, the body can utilize the aerobic pathways effectively since the demand for immediate energy is not as high, and the supply of oxygen is sufficient to support ongoing metabolism. This leads to a steady energy supply while minimizing fatigue.

Other energy systems, such as the anaerobic energy system, phosphagen system, and lactic acid system are more suited for short bursts of high-intensity activity where rapid energy production is required. These anaerobic systems do not rely heavily on oxygen and are unable to sustain prolonged efforts like the aerobic system can, which further highlights why the aerobic system is the primary energy provider for long duration, low intensity activities.