VO2 max

VO2 max

Ergospirometry laboratory setup for VO2 max testing

Gas exchange analysis during a VO2 max test

VO2 max (also maximal oxygen consumption, maximal oxygen uptake, or maximal aerobic capacity) is the maximum rate of oxygen consumption measured during incremental exercise; that is, exercise of increasing intensity. The name is derived from three abbreviations: "V" for volume, "O2" for oxygen, and "max" for maximum. VO2 max is expressed either as an absolute rate in liters of oxygen per minute (L/min) or as a relative rate in milliliters of oxygen per kilogram of body mass per minute (mL/kg/min).

Physiology

VO2 max is an important determinant of endurance capacity during prolonged exercise. It is influenced by both genetic and environmental factors. The measurement of VO2 max is generally considered the best indicator of cardiovascular fitness and aerobic endurance. During exercise, oxygen is used to produce energy in the form of adenosine triphosphate (ATP) through aerobic metabolism. The higher the VO2 max, the more oxygen the body can utilize, and the more energy can be produced.

Measurement

VO2 max is typically measured using a treadmill or cycle ergometer in a laboratory setting. The test involves increasing exercise intensity until exhaustion while measuring ventilation, oxygen, and carbon dioxide concentration of the inhaled and exhaled air. This is often done using a metabolic cart in a process known as ergospirometry.

Factors affecting VO2 max

Several factors can affect VO2 max, including age, sex, training status, and altitude. Generally, VO2 max decreases with age and is higher in males than in females. Endurance training can significantly increase VO2 max, while living at high altitudes can also enhance it due to increased red blood cell production.

Importance in sports

VO2 max is a key performance indicator in endurance sports such as marathon running, cycling, and cross-country skiing. Athletes with higher VO2 max values are often able to sustain higher intensities of exercise for longer periods.

Related pages

• Aerobic exercise
• Anaerobic exercise
• Cardiovascular fitness
• Metabolic equivalent

References

• Bassett, D. R., & Howley, E. T. (2000). Limiting factors for maximum oxygen uptake and determinants of endurance performance. Medicine and Science in Sports and Exercise, 32(1), 70-84.
• Levine, B. D. (2008). VO2 max: what do we know, and what do we still need to know? The Journal of Physiology, 586(1), 25-34.