What is the main physiological benefit of using a high oxygen concentration gas?

Using a high oxygen concentration gas, such as enriched air nitrox, offers significant physiological benefits, particularly in terms of enhancing the efficiency of oxygen delivery to tissues. When divers use a gas mixture with a higher percentage of oxygen, the increased partial pressure of oxygen improves the amount of oxygen available for diffusion into the bloodstream and ultimately to the body's tissues. This can enhance aerobic metabolism and overall tissue oxygenation, which is crucial during physical exertion or when underwater.

This improved delivery of oxygen can reduce the physiological stress placed on the body during dives, allowing divers to maintain better physical performance levels over extended periods. Enhanced oxygenation can also facilitate quicker recovery from exertion, which is beneficial during multi-level and repetitive dives. Consequently, divers may experience reduced fatigue, improved endurance, and better overall health during diving activities.

Other options, while related to dive practices, do not directly address the primary physiological advantage associated with high oxygen concentration gases.