سرعة القلب
Depending on what an actor is doing, his or her heart rate will vary. This is the body's way of responding to stress. Prior to a show one will see an increase in heart rate due to anxiety. While performing an actor has an increased sense of exposure which will increase performance anxiety and the associated physiological arousal, such as heart rate. Heart rates increases more during shows compared to rehearsals because of the increased pressure, which is due to the fact that a performance has a potentially greater impact on an actors career. After the show a decrease in the heart rate due to the conclusion of the stress inducing activity can be seen. Often the heart rate will return to normal after the show or performance is done; however, during the applause after the performance there is a rapid spike in heart rate. This can be seen not only in actors but also with public speaking and musicians.