The aim of this study was to evaluate the changes in maximal oxygen consumptionas a result of a special conditioning training program. We studied ten female players of Bulgarian National Volleyball Team during their preparation for the World Championships in Japan-2018. For 8 weeks they performed 2 strength training sessions weekly using our methodology. We estimated the differences in between the beginning and the end of the preparation period and we found a small, but statistically significant increase in its values.