The purpose of the study is to detect the effect of 8 weeks core training on aerobic endurance, blood-oxygen saturation and elasticity in the male taekwondo competıtors 15 to 17 years old. A total of 30 taekwondo athletes, between 15 and 17 years old of whom were 15 experimental and 15 control groups, participated in the study. The age (year), height (cm), weight (kg) of athletes were recorded on personal information form using an electronic scale, Geonaute. While the athletes in control group were regularly proceeding on taekwondo workouts, the core training programme was applied to the ones in experimental group three days a week for an extra eight weeks. Before starting to the workouts, yo-yo aerobic endurance test in the determination of aerobic endurance measurement; pulse oximetry measuring device in the determination of measurement; sit and reach test in the determination of elasticity ability were applied After all data were collected, it was recorded as pre-test and post-test. The control group proceeded regularly on taekwondo training significance levels were accepted as 0.05 in these tests. As a result, it was determined that the core training programme had a positive effect on aerobic endurance and elasticity test, pre-test and post-test difference values of the control and experimental groups. In both of these determined differences, it was detected that the values of the experimental group were higher than the control group. However, it was observed that there was no significant difference between resting heart rate and blood oxygen saturation test, post-test and pre-test of the conrol and experimental groups. It is thought that the core training programme will help the athletes to improve their sportive performances during working season, in the process of training and competition season and to take them to an advanced level.

Aerobic Endurance, elasticity, blood oxygen saturation, core training.