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Endurance Capacity Index

Meaning

The Endurance Capacity Index is a calculated metric that quantifies an individual’s maximal ability to sustain prolonged submaximal physical or physiological effort without undue fatigue or significant loss of functional output. This index is a composite measure derived from multiple physiological parameters, including maximal oxygen uptake (VO2 max), lactate threshold, and metabolic efficiency, all of which are strongly influenced by endocrine function. A higher index indicates superior cardiovascular fitness, optimized mitochondrial density, and efficient fuel substrate utilization, reflecting robust systemic health. It serves as a clinical benchmark for cardiorespiratory and metabolic resilience.