What is defined as the period of time from the interruption of oxygen supply to when useful function is lost?

The period described as the time from the interruption of oxygen supply to when useful function is lost is known as the Time of Useful Consciousness. This term specifically refers to the critical window during which a person retains the ability to perform tasks effectively after experiencing a decrease in oxygen levels, such as those encountered at high altitudes or in situations involving decompression.

During this time, an individual may still be conscious and able to respond but is at increasing risk of cognitive or physical impairment as the oxygen supply continues to diminish. Understanding this concept is crucial for pilots and those involved in aerospace operations, as it informs emergency protocols and decision-making in scenarios where supplemental oxygen may be needed. The concept of Time of Useful Consciousness emphasizes the urgency of recognizing hypoxia symptoms and taking corrective actions before cognitive functions are significantly compromised.