What is physiological reserve?

Physiological reserve refers to the capacity of an organ or system to respond to increased demands or stress beyond its usual baseline function. It indicates the margin of functional ability that can be called upon in times of need, such as during illness, injury, or physical exertion. A higher physiological reserve often correlates with better health outcomes, as it allows individuals to cope with challenges more effectively. Factors such as age, fitness level, and overall health can influence an individual's physiological reserve.