January 01, 2020

When you exercise all your muscles are working harder than normal and, as a result, they must require more energy than normal. Hence, the ATP energy that is used by your muscles is generated with the aid of oxygen so in this case when your breath, it follows that an increase in exercise intensity will result in an increase in muscular oxygen demands. Therefore, increased exercise intensity ultimately corresponds to an increased VO2 which means that you have reached your highest intensity level and you cannot go any farther with more intensity (you will be at the same level where you already are). This is the reason that your breathing gets progressively faster and deeper as your exercise intensity increases, your body is trying to provide more oxygen to your working muscles so that they can generate enough ATP energy to keep you moving.

January 12, 2017

This table above shows the different levels that each athlete needs to reach in order to get to their VO2 MAX level. It also depends for whom, it can change for women and men athletes.