Objective: The physiological laboratory-course is one of the most important instruments to teach medical students physiology. In order to use the time in the lab as effective as possible it is necessary that the students are well prepared for the experiments they will run during the course. Nevertheless Students are often overstrained by the mere practical execution of the experiments and therefore are not focused on the physiological phenomena they should observe. To improve the possibilities for the students to prepare themselves for the course, we established Video Tutorials (VTs) – short Films in witch we demonstrate the experiments and the handling of the laboratory apparatus. The VTs were provided on our faculty's eLearning Platform. Methods and Results: In a first study 2008 we evaluated the feasibility and the acceptance of the VTs. Nearly 95% of the students (n=178) perceived the VTs to be "helpful" or "very helpful" for the preparation and understanding of the experiments. In a second study witch is currently running we try to validate the effectiveness of the VTs in a cooperative test. The Students of one Class (approx. 200) are divided in two Groups (Group I and II). New VTs are provided for two courses, Renal Physiology (A) and Peripheral Circulation (B). Group I was provided with VTs for Course A and a printed script for Course B. Group II got a printed script for Course A and VTs for Course B. Both Groups will be compared in their performance during the lab course and their test scores (test with questions referring to the topics of the course). Conclusion: The first study clearly showed that the students evaluate the VTs to be a very helpful tool for preparing and understanding the physiological experiments. The second study will provide evidence if the students working with the VTs show a better learning outcome or a better performance during the laboratory-course.