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INFLUENCE OF DIFFERENT TYPES OF SURFACES ON THE RESULTS OF RUNNING SPEED TESTS IN YOUNG SOCCER PLAYERS

100%
Jastrzębski Z., Bichowska M., Rompa P., Radzimiński Ł., Dargiewicz R.
Central European Journal of Sport Sciences and Medicine
|
2014
|
vol. 5
|
issue 1
5-14
EN
The main purpose of this study was to determine the influence of different types of surfaces on the sprint test results. 33 male football players from two age categories - U15 and U18 - performed sprint tests (7 distances between 5 and 30m) and a 150m shuttle run test on three types of surfaces: natural grass [n], a synthetic surface [s] and a rubber surface [r]. The longer distance a player covers, the more likely it is that the importance of the type of running surface will be noticed. The rubber surface diminishes the negative effects of changeable factors on the reliability of the tests and therefore, in our opinion, is recommended for control tests and especially for longitudinal tests. Comparing the results of running speed tests performed on different surfaces and especially in different weather conditions is unjustified.
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Anaerobic Power across Adolescence in Soccer Players

100%
Nikolaïdis P.
Human Movement
|
2011
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vol. 12
|
issue 4
342-347
EN
Purpose. Although the contribution of anaerobic power in soccer performance is recognized, this component of physical fitness is not well-studied in adolescent players. The aim of this study is to investigate the development of anaerobic power across adolescence in a laboratory setting. Methods. Male adolescents (N = 217; aged 12.01-20.98 y), classified into nine one-year age-groups, and adult players (as the control group, N = 29; aged 21.01-31.59 y), who were all members of competitive soccer clubs, performed the 30-s Wingate anaerobic test (WAnT) against a braking force of 0.075 Kg · Kg-1 of body mass. Results. Compared with previous age-matched studies on the general population, the participants exhibited superior WAnT scores. The Pearson moment correlation coefficient between age and peak power (Ppeak) was r = 0.71 (p < 0.001) and between age and mean power (Pmean) r = 0.75 (p < 0.001). Even when body mass or fat free mass was taken into account, the effect of age on these parameters remained (0.51 < r < 0.55, p < 0.001). One-way analysis of variance revealed differences in anaerobic power between the age groups across adolescence (p < 0.001), with the adult and age groups in the higher spectrum of adolescence performing better than those in the lower spectrum, supporting the aforementioned findings. Conclusions. We confirmed the importance of short-term power in adolescent soccer players, as well as the strong association between this sport-related physical fitness parameter and body mass and fat free mass (0.89 < r < 0.94, p < 0.001). However, what is novel is that we demonstrated that age effect on Ppeak and Pmean remained even when body mass and fat free mass were factored out.
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