Recognized as a great promoter of health, the physical activity includes beneficial changes such as reduced risk of chronic degenerative diseases, bone loss and cardiovascular disease. Recently, another aspect has gained enough prominence, it is the improvement of cognitive function, several studies have shown that physical exercise enhances and protects brain function. Thus, this study aimed to quantify, using a Computer Game, the effect of intense physical activity on the concentration of students with evidence of "Attention Deficit Hyperactivity Disorder." The sustained attention was quantified by applying a computerized test of attention from an intense aerobic activity for five minutes.