Autonomic Responses of Amateur Child Athletes to Aerobic Exercise Test

The aim of our study was to investigate the relationship between aerobic capacity, which will be revealed by aerobic exercise test, and HRV, blood pressure, heart rate and pulmonary function parameters in healthy children interested in different sports branches (boxing, weightlifting, taekwando, swimming). The main questions it aims to answer are: * Is there any relationship between aerobic capacity demonstrated by 20 m shuttle test and heart rate variability, blood pressure, heart rate and respiratory parameters in different sports branches? * Is there a relationship between the month/year that children/adolescents are involved in sports and HRV, blood pressure and respiratory parameters? Participants: * Before the exercise test, ECG, blood pressure, heart rate and pulmonary function test will be performed. * A 20 meter shuttle run test will be performed. * Measurements will be repeated after the exercise test.