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Fitness Endurance Capacity

Meaning

Fitness Endurance Capacity is a measure of the body’s physiological ability to sustain prolonged sub-maximal physical exertion without undue fatigue, reflecting the robustness of the cardiorespiratory and muscular systems. Clinically, it is quantified by metrics such as V̇O₂ max, lactate threshold, and the efficiency of substrate utilization during exercise. High endurance capacity is a powerful indicator of overall cardiovascular health, mitochondrial density, and metabolic flexibility, which are all strongly linked to long-term health and longevity. It is a key performance metric for assessing an individual’s functional reserve.