Using the lag of autocorrelation function in order to identify the anaerobic threshold during dynamic physical exercise

The Anaerobic Threshold (AT) is one of the best parameter to quantify aerobic capacity at sub-maximal dynamic physical exercise power levels. By the other side, there is a function in nonlinear dynamics called Aurocorrelation Function (ACF). We measure the AT, in this work, in a non-invasive way, using the ACF. The results exhibited a perfect correlation with previous works that used the same set of data, but the method now proposed is faster and easier to apply, producing an almost instantaneous visual outcome.