Bouts of work exceeding three minutes are powered by which of the following systems?

Bouts of work that exceed three minutes are primarily powered by the oxidative energy system. This system is essential for sustained, long-duration activities as it utilizes oxygen to convert carbohydrates and fats into energy. The oxidative system is highly efficient for providing the necessary ATP (adenosine triphosphate) to support prolonged exercise, particularly in aerobic conditions where oxygen is readily available.

As activities extend beyond the one to three-minute mark, reliance on anaerobic systems like the immediate and glycolytic systems diminishes since they are more suited for short bursts of intense effort. In contrast, the oxidative system can effectively fuel exercise for extended periods, making it crucial for endurance activities and helping in the performance of longer workouts.

Understanding the role of the oxidative system is beneficial for designing training programs that enhance endurance and efficiency in athletes, highlighting its significance in tactical conditioning.