Performance is defined as the physiological potential required for an individual's physical activity. The sportive activity that he creates with his potential is defined as the sportive performance level of the individual. There are many factors that determine athletic performance. These factors are; environmental factors such as heredity, physical structure, training level, technical capacity and mental adequacy, quality of training areas, nutritional quality, suitability in weather conditions. All these factors affect the planning of multidisciplinary and interdisciplinary approaches that affect the performance of the athlete.

Autonomic regulation is very important for the reorganization of the athlete's performance. Auricular vagus nerve stimulation (VNS) is a non-invasive method. With this method, autonomic nervous system regulation can be done practically. In the literature, there are no studies examining the effect of VNS on recovery and performance in athletes.

In this study, the effects of auricular vagus nerve stimulation on performance and recovery were investigated, which was designed as a randomized controlled trial, a single session of VSU was applied to 60 male professional athletes (30 experimantal, 30 control). The normal application waveform was biphasic asymmetric, with a pulse duration of 300 microseconds and a frequency of 25 hertz, for 20 minutes and continuously.

Inclusion Criteria:

• Being an athlete who continues an active sports life.
• Not have an ongoing injury that prevents participation in the study
• To make a medium and high level weekly training period.

Exclusion Criteria:

• Having a systemic or neurological disease affecting the autonomic nervous system.
• Be younger than 18 years old and over 40 years old.
• Loss of sensation affecting the inner and outer ear, etc. have the disease.
• Having any acute systemic disease to exercise.

60 people between the ages of 18-40, who applied to the Orthopedics and Traumatology Department of Private Ataşehir Florence Nightingale Hospital, performed pre-mid-end performance training, completed rehabilitation after injury, continued active sports life, and had moderate and high training tempo. male professional athlete.