The goal of this study was to assess effectiveness of a short collective stress inoculation training (SIT) conducted according to the methodology of the Virtual Reality Medical Center of San Diego (Training of Physiological Control Exposure to Virtual Stressor while Maintaining Physiological Control). The results obtained indicate a short-term effectiveness of the training as a method of tension reduction. However, in the long-term perspective these results are ambiguous and they suggest a need of further research. In order to extend the analysis effects of temperamental factors on training effectiveness was presented.