How does a submaximal exercise test work?

A submaximal exercise test is designed to estimate an individual's VO2 max or maximum oxygen uptake by analyzing the relationship between heart rate and exercise intensity. During this type of testing, the subject performs exercise at various submaximal levels, and their heart rate is measured in response to these levels. The underlying principle is that as exercise intensity increases, heart rate will also increase in a predictable manner up to a certain point. By plotting these data points and extrapolating, practitioners can estimate the individual's aerobic capacity (VO2 max) without the need for maximal exertion, which can be unsafe for certain populations.

This approach is particularly useful for people who may not be able to perform maximal exercise testing due to health concerns or lack of fitness. It provides important fitness assessment data while minimizing risk. The other options do not accurately describe the purpose or methodology of a submaximal exercise test, which focuses on heart rate response and aerobic capacity rather than blood pressure, strength, or flexibility.