THE IMPACT OF DIFFERENT PLAY POSITIONS ON SOME MORPHOLOGICAL INDICATORS FROM THE YO-YO IR1 TEST IN YOUNG FOOTBALL PLAYERS

Armend Myftiu

Abstract

The aim of this study is to observe if there are any differences between different team play-positions based on the characteristics of functional capacities, namely: (VO2 max.) maximum oxygen uptake during load, (HR) maximum heart rate frequency, (Lactate) lactic acid accumulation in the blood and (Distance) running distance after completing the specific endurance test (Yo-Yo Intermittent Recovery 1) in young football players. This study involved a total of 33 football players (age: 15.8 ± 0.4; body mass: 60.9 ± 7.7 kg; body height: 173.2 ± 6.2 cm) from two elite football clubs in North Macedonia. Players were divided in three groups: defenders, midfielders and strikers. After examining functional parameters through the method of multivariate analysis of variance (MANOVA), the group mean value differences of the three team play positions in the same field (VO2 max., HR, Lactate, Distance) from the Yo-Yo IR1 specific endurance test were examined, where a significant impact effect was observed, Wilk`s ?= .46, F(8, 54) = 3.18, p < .005, multivariate n2= .32. Through the univariate analysis of variance (ANOVA), a statistically significant effect related to the difference of the team play position profile was observed in the accumulation of the lactic acid in the blood F (2, 30) = 5.1,p < .005, n2= .25. Following the Yo-Yo IR1 test based on this research, young football player profiles in different play positions in the team showed no significant difference in: running distance, heart rate frequency and maximum oxygen uptake. A significant difference in the accumulation of lactic acid in the blood was observed in the group of strikers, compared to those of defenders and midfielders. Strikers, although running the shortest distance, had higher lactic acid concentration in the blood compared to midfielders or defenders.

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