0.0352
L/(min·kg)
2.465
L/min
2,465
mL/min
0.0352
L/(min·kg)
2.465
L/min
2,465
mL/min
The Oxygen Consumption Rate calculator determines VO₂, the rate at which an organism consumes oxygen during metabolism. VO₂ is the gold standard measurement of metabolic rate and aerobic capacity, reflecting the body's ability to take in and utilize oxygen for energy production through oxidative phosphorylation.
This calculator uses the difference between inspired and expired oxygen fractions multiplied by the air flow rate to determine total oxygen uptake. The result is normalized by body weight for comparative purposes. VO₂ measurements are essential in exercise physiology, clinical assessment of cardiopulmonary function, and comparative animal physiology.
Oxygen consumption is calculated from ventilation and oxygen fraction difference:
VO₂ (total) = Flow Rate × (FiO₂ - FeO₂)
VO₂ (per kg) = Total VO₂ / Body Weight
FiO₂ is the fractional concentration of oxygen in inspired air (0.2093 for room air), and FeO₂ is the fraction in expired air (typically 0.16-0.17 at rest). The difference represents the oxygen extracted by the body per unit volume of ventilated air.
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At rest, a 70 kg person with 6 L/min ventilation consumes about 296 mL O₂/min (approximately 4.2 mL/kg/min), which is close to 1 MET.
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During vigorous exercise, ventilation increases dramatically. At 80 L/min, VO₂ rises to about 3.9 L/min or 56 mL/kg/min, reflecting high aerobic demand.
Normal resting VO₂ is approximately 3.5 mL/kg/min, defined as 1 MET (metabolic equivalent). Total resting VO₂ for a 70 kg person is about 250 mL/min. During maximal exercise, trained athletes can achieve VO₂max values exceeding 70-80 mL/kg/min, while untrained individuals typically reach 35-45 mL/kg/min.
Normalizing by body weight allows fair comparison between individuals of different sizes. A larger person naturally consumes more total oxygen but may not have greater aerobic fitness. Per-kilogram values enable comparisons across individuals, species, and activity levels on an equal basis.
The Fick equation states that VO₂ = Cardiac Output × (Arterial O₂ - Venous O₂). This relates oxygen consumption to cardiovascular function and tissue oxygen extraction. The ventilation method used in this calculator measures the same quantity from the respiratory side rather than the cardiovascular side.
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