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Hematological Profile of Serbian Youth National Soccer TeamsSoccer is one of the most widely played and complex sports in the world, where players need technical, tactical, and physical skills to succeed. Technical and tactical skills in soccer are highly dependent on the player's physical capacity. The selection, development and professional guidance of young players is a priority for many top soccer clubs in order to maintain their sporting and financial status. The aim of the present study was to determine hematological profile of youth national soccer teams and to compare the values of fifteen hematological parameters between 3 Serbian youth national teams (under 14, 15 and 16 years old), as well as between soccer players and nonathletes. 80 young soccer players and 30 non-athletes participated in the study. 15 hematologic parameters (WBC, RBC, HGB, HCT, PLT, MCV, MCH, MCHC, PDW, LYM%, MON%, GRAN%, LYM, MON, GRAN) were measured. In order to determine the significance of differences between the groups on a multivariate level a multivariate analysis of variance (MANOVA) was administered, and to test the differences between the groups on an univariate level a univariate analysis of variance (ANOVA) was applied. It was concluded that there is no significant difference in all the variables (WBC, Ly, Mo, Gr, PLT, HGB, HCT, etc), except RBC, probably due to age, androgen affection on erythropoesis, field positoning and diet. From a practical point of view, the clinician has to take into account not only age, but also training status of individuals when evaluating their blood tests.

The aim of this paper was to determine the influence of strength on the results of the vortex throw. The research was carried out on a sample of 50 children aged 7 to 10, using the following measuring instruments for the evaluation of strength: the standing long jump, throwing a medicine ball from a supine position, torso lifts for 30 s knees bent, the plank and hanging leg raises. The research also included one measuring instrument for the evaluation of the distance in the vortex throw (the criterion variable). Based on the obtained results, it can be concluded that strength has a statistically significant influence on the results of the vortex throw among children aged 7 to 10 with a shared variability of approximately 43%. The greatest part of this significance can be ascribed to the tests of the medicine ball throw from a supine position which is responsible for the evaluation of the strength of the arms and shoulder belt. There were also significant correlations of the variables the standing long jump and torso lifts for 30 s knees bent with the result in vortex throw, but they did not significantly affect the results for this age group.

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The aim of this study was to analyze the somatotypes of top young race walkers in Europe. For the analysis of their somatotype, the Heath-Carter method was used.  By applying digital anthropometry and computer programs, the somatotypes of 44 participants aged 15 to 17, sports walkers of both genders (21 boys and 23 girls), were determined. Based on the analysis, extensive data were obtained on the somatotype of top young race walkers, where a large number of groups emerged. Among the boys, there are three groups of somatotypes: ectomorph-mesomorph (1.8-6.7-4.1), mesomorph-ectomorph (1.4-4.2-5.6) and mesomorph-ectomorph (1.7-5.1-5.1). The results showed that as many as 7 different groups of somatotypes can be found among the girls: endomorph-mesomorph (4.5-7.9-2.4), ectomorph-mesomorph (3.5-6.4-4.3), central (3.1-3.7-4.0), balanced mesomorph (3.5-6.0-3.6), balanced ectomorph (2.7-1.6-6.4), mesomorph-ectomorph (3.3-5.0-4.7), mesomorph-ectomorph (2.7-4.4-5.2). The analyzed somatotypes of top young race walkers indicate the considerable heterogeneity of the group of participants. The intermediate somatotype among the males is defined as ectomorph-mesomorph (1.7-6.1-4.5), whereas the intermediate somatotype among the females is defined as a central somatotype (3.5-5.5-4.0).