Typical blood oxygen levels, measured as a percentage, reflect the degree to which hemoglobin in red blood cells is carrying oxygen. A reading generally considered healthy at rest falls between 95% and 100%. During physical activity, these values can fluctuate based on individual physiology, the intensity of exertion, and underlying health conditions. An example would be an individual with healthy lungs maintaining a reading above 90% even during strenuous aerobic activity, indicating adequate oxygen supply to the muscles.
Maintaining sufficient oxygenation during physical stress is crucial for cellular energy production and optimal physiological function. Adequate oxygen delivery ensures that muscles receive the necessary fuel to perform, delays fatigue, and supports overall athletic performance. Historically, monitoring this has been crucial in assessing respiratory health, particularly for individuals with conditions like asthma or chronic obstructive pulmonary disease, to tailor exercise regimens and ensure safety.
