The study sought to identify variations in the electromyographic signals of the erectoris muscles of the back during the use of the Standing Desk in relation to a seated workstation under normal conditions. To carry out the study, 13 workers were involved, who were exposed to three measurement configurations. The first configuration corresponded to 75 minutes of exposure to sitting posture (C1), the second consisted of sitting for 60 minutes and 15 minutes standing (C2) and the third, a 45-minute exposure sitting and 30 minutes standing (C3) . The measurements lasted 75 minutes each, were carried out on three different days to guarantee their randomness and in a space that was adapted to simulate a conventional office. In each measurement, the participants performed real and daily administrative work tasks in front of the computer while being monitored by means of surface electromyography (EMGS). Signal processing and amplitude distribution analysis (APDF) were performed in Analyzer®. Once the data was smoothed, the general distribution was analyzed through the Shapiro Wilk normality tests and the statistical tests corresponding to the interior of each configuration and between them. The results of the study allowed to conclude that the variations of the muscular activity behaved stable in the bilateral long muscle with levels of contraction below the range of effort (p <0.05) in the C1, C2 and C3 configurations. However, it was shown that there was no significant difference in the response of the electromyographic signals from the erectoris muscles of the back during the use of the Standing Desk and the use of a seated workstation under normal conditions. The study opens up a field of knowledge little explored in Colombia regarding postural alternation in administrative tasks with a data display screen, contributing methodologically to future research and new prevention strategies.