Theory. The physiological stress response in the academic context has a typical pattern, especially increased heart rate, decreased heart rate variability and increased blood pressure. Over the time of their studies, students are often exposed to social performance situations, such as giving a presentation. The ensuing stress response should increasingly occur in socially anxious individuals. The present study examined the influence of social anxiety and other personality characteristics on the cardiovascular reactivity of students in a stressful situation. Method. 62 students of psychology (48 women, 14 men) held a presentation in a course organized by the University of Graz. The cardiovascular parameters were recorded with the aid of a long-term ECG for 42 hours. To examine social anxiety the Social Interaction Anxiety Scale (Stangier et al., 1999) was used. Other personality traits tested were the positive and negative affect, as well as the tendency to worry. Results. There was no influence of social anxiety and the other parameters on heart rate and heart rate variability at the beginning of the presentation and five minutes after the end of the presentation. However, there was a correlation between social anxiety and the state anxiety before the beginning of the presentation. Conclusion. Social anxiety had no effect on the cardiovascular reactivity in a stressful situation. The low mean of social anxiety in the sample could have made it difficult to find effects. State - Factors as mediators between personality traits and cardiovascular reactions are discussed.