The purpose of this study was to determine the effect of different light overloads on the vertical impulse, velocity of center of mass and peak power during two consecutive maximum vertical jumps. 28 athletes practicing different sports where vertical jump is a basic skill have participated. A force platform, operating at 500 Hz, temporally synchronized to a video camera, which recorded at 210 Hz the sagittal plane of the jumps were used for the analysis. The results have shown that when overloads of 7,5% of body weight were used , the time used for the counter- phase increased. The vertical impulse and peak power did not vary with the use of different levels of light overloads used in this study, however, the take-off velocity the CM was reduced with a similar percentage that increased the overload.