Oxygen Pulse (O2 Pulse Index) Calculator

Oxygen Pulse (O₂ Pulse Index): Explanation and Clinical Context The Oxygen Pulse is defined as the amount of oxygen consumed per heartbeat during exercise, calculated by dividing VO₂ (oxygen uptake in mL/min) by heart rate (bpm). It serves as a non-invasive surrogate for stroke volume during exercise. Normal values in healthy adults range approximately from 10 to 15 mL/beat, but may vary with age, sex, fitness level, and exercise protocol.

Clinically, a low oxygen pulse may indicate impaired stroke volume, potential cardiac dysfunction, or reduced cardiovascular efficiency. It is often used in cardiopulmonary exercise testing (CPET) to assess functional capacity, predict prognosis in heart failure, and stratify risk in patients with cardiovascular disease. Serial measurements during progressive exercise can help differentiate between cardiac limitation and peripheral muscular limitation.