Oxygen consumption refers to the amount of oxygen used by the body during various activities, such as exercise or rest. It is a crucial process for producing energy, as cells require oxygen to convert nutrients into usable energy through a process called cellular respiration. Higher levels of activity typically lead to increased oxygen consumption. Measuring oxygen consumption can help assess physical fitness and overall health. It is often evaluated during exercise tests, where individuals perform activities while their heart rate and breathing are monitored. This information can guide training programs and help identify potential health issues.