What does VO2 measure in exercise physiology?

The measurement of VO2, or oxygen consumption, is crucial in exercise physiology as it reflects the volume of oxygen that the body utilizes during physical activity. This is specifically defined as the difference between the volume of oxygen inhaled and the volume of oxygen exhaled. It provides valuable insights into the efficiency of the cardiovascular and respiratory systems, as well as the metabolic demands of physical exertion. By assessing VO2, trainers can determine an individual's aerobic capacity and endurance performance, as higher VO2 values generally indicate better cardiovascular fitness.

This measurement is essential for developing tailored training programs that aim to improve an individual's aerobic capacity and overall fitness levels. Unlike other metrics, such as heart rate or calorimetry, which assess different physiological aspects, VO2 gives a specific focus on the oxygen exchange that is central to energy production during prolonged physical activities.