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THE INDICES OF THE CARDIOVASCULAR SYSTEM IN CHILDREN PRACTICING KARATE

E. A. PAK (1), Z. F. MAVLYANOVA (2), O. A. KIM (2) 1 -SAMARKAND SCIENTIFIC CENTER OF PEDIATRIC SURGERY OF THE MINISTRY OF HEALTH OF THE REPUBLIC OF UZBEKISTAN, SAMARKAND, UZBEKISTAN 2 -SAMARKAND STATE MEDICAL INSTITUTE OF THE MINISTRY OF HIGHER AND SECONDARY SPECIAL EDUCATION OF THE REPUBLIC OF UZBEKISTAN, SAMARKAND, UZBEKISTAN

Objective: to study the state of cardiovascular system in children engaged in karate in Samarkand, Uzbekistan.
Materials and Methods: the functional indices of the cardiovascular system of 61 boys aged 10 to 15 years, who were engaged in karate for more than 2 years (the main group) and 50 boys of the same age, not engaged in sports activities (the control group) were studied. The assessment of the cardiovascular system included heart rate (HR), stroke volume (SV) and minute volume (MV) of blood. The indices of cardiovascular system were examined at rest and on the 2nd, 3rd, 4th minute of recovery period after the Harvard step test.
Results: the most significant changes in HR indices occur only by the age of 14–15 years, when the long training process of karate gives substantive results. Statistically significant differences between SV and MV indices of two groups were found only in teenagers of 14–15 years old at rest, before the physical activity and on the 2nd and 3rd minute of the recovery period after the Harvard step test.
Conclusions: children practicing karate at the age of 14-15 years had significantly lower HR indices and higher SV and MV indices. After the physical activity HR, SV and MV indices returned to the initial level on the 4th minute of the recovery period only in children of 14–15 years old, with the longterm experience of karate.
Keywords: 
children; karate; cardio-vascular system; heart rate; stroke volume of blood; minute volume of blood; physical activity; Harvard step test.