What are respiratory benefits of exercise?

• A. Increased work of breathing
• B. No respiratory change
• C. Improved alveolar ventilation/diaphragmatic excursion, decreased work of breathing
• D. Worsened gas exchange

Answer: (C)

Regular aerobic exercise strengthens the muscles used for breathing and makes the breathing pattern more efficient. With training, the diaphragm and intercostal muscles become stronger, allowing deeper breaths (greater diaphragmatic excursion) and more effective air movement per breath. This improves alveolar ventilation, meaning air reaches the alveoli more effectively, and the overall efficiency of breathing increases. Because the respiratory muscles are more capable, the work required to breathe during activity decreases, so you can sustain exercise with less breathlessness. These changes also support better gas exchange through improved ventilation-perfusion matching.