THE COMPARE OF OXYGEN UPTAKE KINETICS OF YOUNG SOCCER PLAYERS ACCORDING TO PLAY POSITIONS

The purpose of this study was to compare oxygen uptake kinetics, ventilatory threshold of young soccer players according to playing position and to determine relationship between oxygen uptake kinetics and ventilatory threshold of young soccer players. Twenty-three young soccer players joined to study voluntarily (n=23; age: 19.8±0.4 years, body height: 179.4±7.2 cm., body mass: 74.2±7.4 kg., VO 2 max: 59.7±8 ml/kg/min.). The players were categorized according to playing positions. The VO 2 max, ventilatory threshold were determined by incremental treadmill test. Then, treadmill test at running velocity determined VO 2 max was performed and oxygen uptake kinetics were identified by mono-exponentinal model. The time to achieve 95% of VO 2 max, spending time at VO 2 max were accepted as oxygen uptake kinetics. The correlation among time to achieve 95% of VO 2 max, spending time at VO 2 max and ventilatory threshold values of young soccer were determined by correlation anlyze and differences according to playing positions were identified by one-way analysis of variance. It was determined significiant negative correlation between time to achieve 95% of VO 2 max and spending time at VO 2 max (r=-0.526, p<0.05). The no significiant difference among playing positions was found without time to achieve 95% of VO 2 max. The centerbacks had higher time to achieve 95% of VO 2 max values than goalkeepers (p<0.05) but no significiant difference among other playing positions was found (p>0.05). Consequently, it could be said that reaching to steady-state level early during exercise could shorten time to achieve 95% of VO 2 max and increase spending time at VO 2 max. Twenty-three young soccer players playing young team category of professional soccer team placing Turkish Super League participated to this study voluntarily (n=23; age: 19.8±0.4 years; body height: 179.4±7.2 cm; body mass: 74.2±7.4 kg; VO 2 max: 59.7±8 ml/kg/min). Twenty-three young soccer players were divided to six playing position categories as goalkeepers (n=3; age: 19.7±0.5 years; body height: 186.3±1.5 cm; body mass: 83.1±2.8 kg; VO 2 max: 52.3±1.2 ml/kg / min), fullbacks (n=4; age: 19.8±0.5 years; body height: 176.8±2.8 cm; body mass: 67.9±4.7 kg; VO 2 max: 62.3±0.5 ml/kg / min), centerbacks (n=4; age: 19.8±0.5 years; body height: 185.5±7.9 cm; body mass: 79.3±9.9 kg; VO 2 max: 59.3±5.6 ml/kg / min), midfielders (n=4; age: 19.8±0.5 years; body height: 176.8±2.8 cm; body mass: 67.9±4.7 kg; VO 2 max: 69.3±8.8 ml/kg / min), wingers (n=4; age: 19.8±0.5 years; body height: 169.8±1.7 cm; body mass: 68.0±1.2 kg; VO 2 max: 58.3±3.4 ml/kg / min), forwards (n=4; age: 20 years; body height: 182.3±2.6 cm; body mass: 74.4±0.7 kg; VO 2 max: 55±11.2 ml/kg / our The findings of this research revealed significiant negative correlation between ta-95%VO 2 max and t-VO 2 max of young soccer players. The VO 2 kinetics of young soccer players were determined by mono-exponentinal model at test of 100 %vVO 2 . The Vt didn’t have any significiant correlation with ta-95%VO 2 max and t-VO 2 max parameters. Also, no significiant difference was determined among playing positions in terms of t-VO 2 max and Vt parameters . Only, it was seen significiant difference between goalkeepers and centerbacks in terms of ta-95%VO 2 max parameter. The many studies at literatüre focused aerobic capacities parameters such as VO 2 max and some of them were parallel to our study in terms of results. The VO 2 kinetics are valuable for evaluation of aerobic performance. According to negative correlation between ta-95%VO 2max and t-VO 2 max parameters, it can be said that t-VO 2 max parameters depend on ta-95%VO 2 max parameters and reaching to steady-state level as soon as possible during exercise and maintaining exercise at this level were important for aerobic performance within the context of t-VO 2 max.