LACTATE THRESHOLD USING MATHEMATICAL DETECTION OF THE EMG DURING INCREMENTAL PEDALING EXERCISE

Abstract

The purpose of this study was to determine the validity of using the EMG as a noninvasive method to estimate LT in non-athletes subjects. Twenty-four non-athletes subjects performed an incremental exercise protocol that consisted of stepwise increases in power output of 25W every 3 minutes until exhaustion at 80 rpm. The EMG was recorded from the right vastus lateralis and right rectus femoris each 15 seconds. Blood samples were taken every 3 minutes. The LT was determined using a log-log transformation model. The EMGT was determined mathemathically using MATLAB® software that models RMS response to gradual exercise using linear regression. The results showed high the correlation coefficients between EMGT and LT, and the validity of using EMG to estimate the LT power output was confirmed.