VirtualSC Physical Education (PE) Practice Exam 2025 - Free PE Practice Questions and Study Guide

During high-intensity exercise, carbohydrates are the primary source of energy for the body. This is due to their ability to be rapidly broken down into glucose, which can then be utilized for immediate energy production through anaerobic means. When physical activity is intense, the body relies on anaerobic metabolism, which effectively uses glucose without the need for oxygen, leading to quick energy release necessary for high-performance activities.

Carbohydrates provide a more efficient and quicker energy supply compared to fats and proteins. Fats, while being a significant source of energy during lower-intensity, prolonged exercise, are not rapidly mobilized in the same way as carbohydrates. Protein serves more as a building block for muscle repair and recovery rather than a primary energy source during exercise. Vitamins, although essential for various bodily functions and metabolic processes, do not directly provide energy. Thus, carbohydrates are essential for optimal energy levels during high-intensity exercise.