Purpose:Identify the age features of hockey players aged 13-16 years old physical development. Material:Elite hockey players (n = 83, age -13-16 years) were surveyed. Standard anthropometric methods for measuring length and body weight were used. The body mass index (BMI) was calculated. Results:The average value of the body length of hockey players did not differ from peers, who do not engage in sports. The cental distribution of the absolute values of the indicator relative to nomograms has been shifted to the right. Most hockey players had average body lengths. The excess of the average body weight of hockey players was recorded in comparison with the average population values. The cental distribution of absolute values was characterized by a significant shift to the right (range 3% -90% percentile). Most hockey players had a body weight "above average" (55-66%). The group of athletes with body weight and BMI "below average" was 6% (age from 13 to 15 years). Conclusions:The physical development of elite hockey players is characterized by an average body length with a tendency to shift to values "above average". The proportion of hockey players with mean body lengths below the midpopulation is very small. Elite hockey players are characterized by large body weight and BMI compared to peers who do not engage in sports. As the age increases from the morphological criteria, the body weight and BMI have the greatest value for the hockey player's success in sports selection.

Aim. The article deals with studying the features of sensorimotor integration and movement coordination in elite hockey players aged 15–16. Materials and methods. A prospective longitudinal study was performed in the competitive phase of preparation. Hockey players aged 15–16 participated in the study (n = 36; attackers and defenders). The control group consisted of  16-year-old students from the college of physical education (n = 15). We performed an examination with the help of NS-PsychoTest software and hardware equipment (Russia, Neurosoft). We assessed the functional status of cortical centers of the nervous system, as well as the speed and accuracy of simple and complex eye-motor reactions. We determined the level of sensorimotor and voluntary movement coordination with the help of tremorometry. Results. Compared to peers, hockey players aged 15–16 possess a higher level of functional indicators under interference conditions (p < 0.05 in all cases) and a better indicator of the concentration of excitation (p < 0.001). Hockey players are characterized by a better speed and accuracy of reaction under interference conditions (p < 0.001 in all cases) and better reaction to a moving object (p < 0.05 in all cases). Compared to peers not-involved in sports, elite hockey players aged 15–16 are characterized by a higher level of voluntary movement coordination with a static form of muscle contraction (p < 0.01). Conclusion. The specific conditions of the competitive activity of hockey players aged 15–16 contribute to an increase in the efficiency of the central nervous system under interference conditions by improving the concentration of excitation. Sensorimotor integration of the players of this age is also distinguished by better predictive accuracy in reactions to a moving object. The parietal-premotor level of movement regulation in hockey players develops in accordance with age-related features, while specific physical loads influence the improvement of voluntary movement coordination with a static form of muscle contraction.

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Acute physical exercise was followed by a decrease in the osmotic resistance of erythrocytes, shortening of the time-to-onset of erythrocyte hemolysis, and increase in the sorption capacity of the cell membrane. Administration of ceruloplasmin 24 h before physical exercise normalizes membrane resistance in red blood cells.

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