Physiological assessments of soccer players in different divisions

Biomedicínská laboratořFaculty of Physical Education and SportFakulta tělesné výchovy a sport

EVALUATION OF THE GOALS SCORING PATTERNS AND THE RELATION BETWEEN TIME AND GOAL SCORING OF FOUR UEFA CHAMPIONS LEAGUE TOURNAMENTS

The purpose of this study was to compare time period and patterns of goal scoring in four UEFA Champions League (UCL) tournaments (2013-2017). All matches (n=500) of the four Champions League tournaments were recorded using video and analyzed with the software Sportsscout. Chi-square methods were used for the data analysis and the level of significance was set at p0.05 for the time period, X2=25.350, p>0.05 for open play and X2=7.503, p>0.05 for set play). The 15-min analysis for each tournament did not show any significant difference if we exclude all extra time periods. However, in UCL 2013-2014 and 2015-2016 more goals were scored in the second half (X2=9.696, p<0.05 and X2=7.496, p<0.05, respectively). With open play more goals were scored than set play (75% and 25% average, respectively). The action that scored the most goals in open play was combination and crosses (21.6% and 22.4% respectively) and in set play was corners and penalties (33.9%, all). The results showed that no differences occurred between CLs regarding the scoring patterns and time periods of scoring. However, goal scoring might be time dependent because more goals were scored in the second half. An explanation for this could be the fatigue and the tactical strategy. About the patterns, coaches must focus on training crosses and passing combinations. Also, they should give a lot of attention to corners of set plays

DIFFERENCES IN GOAL SCORING AND MINUTES OF SCORING BETWEEN TWO EUROPEAN CHAMPIONSHIPS, ONE AMONG 16 TEAMS (EURO 2012) AND THE OTHER AMONG 24 TEAMS (EURO 2016)

The purpose of this study was to record and compare the goal scoring patterns and the minutes of the game that goals were scored between two Euro Cups (2012 and 2016). All matches (n=82) of both the Euro Cups were video taped and analyzed using the sport software Sportscout. Chi-square methods were used for the data analysis and the level of significance was set at p<0.05. The team that scored the first goal in a match was the winner of that match 70.97% of the time in Euro 2012 and 72% in Euro 2016. In open play, the highs of all the actions were more frequent prior to a goal which involved a cross or a through pass. The 15-min analysis showed that the most goals (20%) were scored between the 46th-60th min of the game in the Euro Cup 2012. Furthermore, in the Euro Cup 2016 the most goals were scored between the 31st-45th minute (19%), 46th–60th minute (19%) and between the 76th-90th minute (18%). No differences between the Euro Cups observed. The results indicated that coaches have to make sure their teams score first, press in the offensive third and prepare their players well in set plays to be more effective.

Muscle fibre type, size and satellite cell pool in male volleyball players

Introduction. Longitudinal volleyball training stimuli can cause an increase in muscle strength that is brought about by neurological and morphological adaptations, such as changes in muscle fibre composition percentage and cross-sectional area (CSA). Aim of Study. The aim of this study was to examine the biological adaptations of volleyball-players in terms of muscle fiber type composition, cross-sectional area, myonuclei and satellite cell pool in comparison to physically active controls. Material and Methods. Ten professional volleyball-players (VG) and five physically active-persons (CG) participated in this study. Muscle biopsies were obtained from the vastus-lateralis of the dominant leg. Results. Immunohistochemical analysis revealed that although MHC I and MHC IIC muscle fibre distribution was not different between the groups, MHC IIX and MHC IIAX were totally absent in VG and appeared only in the CG. The cross-sectional area revealed a slightly different pattern as both MHC I and IIA were larger for the volleyball players. In accordance, MHC II myonuclei number was moderately larger in the volleyball players, while the satellite cells and their ratio to number of fibres had a large and very large difference, respectively. Conclusions. In conclusion, our study reveals that volleyball training-induced hypertrophy for both type I and II muscle fibres in the vastus lateralis of volleyball players and resulted in a specific shift in muscle fibres containing MHC II isoforms. This hypertrophy of the muscle fibres is associated with an increase in the myonuclear number and satellite cells

Vrabas. The Effect of Natural and Artificial Grass on Sprinting Performance in Young Soccer Players

Abstract: The sprint performance on natural and artificial grass of 5 th generation was assessed. Sixty eight young male soccer players, which were divided in two groups according to their age [children (n=36; 12.1±0.5y) and adolescents (n=32; 14.2±0.4y)], performed 30-m sprint tests with and without handling the ball on natural and artificial grass. The performance was recorded during 0-10m, 10-30m, and 0-30m running distances. It was found that children were significantly faster during 0-10m running distance on the artificial compared to natural grass when handling the ball while adolescents revealed no differences in sprint performance between the surfaces irrespectively of the ball condition. In running distances 10-30m and 0-30m, children were significant faster in the artificial compared to the natural grass either with or without ball, while the adolescents were significantly faster in the artificial grass only without handling the ball. Children run faster on artificial than natural grass while adolescent soccer players are faster in artificial grass when they do not have to handle the ball. It is clear that children should be more careful when play soccer on artificial grass because the ball is moving faster and greater skill is needed in order to avoid injuries

Exercise therapy in Type 2 diabetes

Structured exercise is considered an important cornerstone to achieve good glycemic control and improve cardiovascular risk profile in Type 2 diabetes. Current clinical guidelines acknowledge the therapeutic strength of exercise intervention. This paper reviews the wide pathophysiological problems associated with Type 2 diabetes and discusses the benefits of exercise therapy on phenotype characteristics, glycemic control and cardiovascular risk profile in Type 2 diabetes patients. Based on the currently available literature, it is concluded that Type 2 diabetes patients should be stimulated to participate in specifically designed exercise intervention programs. More attention should be paid to cardiovascular and musculoskeletal deconditioning as well as motivational factors to improve long-term treatment adherence and clinical efficacy. More clinical research is warranted to establish the efficacy of exercise intervention in a more differentiated approach for Type 2 diabetes subpopulations within different stages of the disease and various levels of co-morbidity

Srovnání fyziologických a neuromuskulárních změn u mladých fotbalových hráčů a netrénovanými mladých osob

Biomedicínská laboratořFaculty of Physical Education and SportFakulta tělesné výchovy a sport

Physiological assessments of soccer players in different divisions

Biomedicínská laboratořFaculty of Physical Education and SportFakulta tělesné výchovy a sport