Effect of collective dance classes paired on the functional state of the circulatory system
The article discusses the dynamics of the adaptive capacity, and local blood flow in the lower limbs of the students in the course of employment by collective structured dance in pairs. The object of the study was 104 students aged 19-20. The total of students enrolled in the experimental group on the technology of collective structured dance in pairs and in the control group on the technology of general physical training. The control group was engaged in a classical program of general physical training, the training was aimed at the development of speed-strength with cyclic loading. The experimental group worked on the program of paired collective structured dance. Training was aimed at the development of the complex sensory-motor coordination. To assess the level of functioning of the circulatory system and determine its adaptive potential (AP) functional changes in the index or coefficient of health were used. The nature of blood flow in the lower limbs was examined by means of rheographic complex Reo-Spectrum-2 by LLC Neurosoft. The analysis of key indicators of hemodynamics in the examined groups showed that the students of the experimental group had a decrease in heart rate and blood pressure over the period of study, whereas the control group students tended to increase these figures. The study calculated the value of the adaptive capacity of the persons in the surveyed groups. At the beginning of the school year the experimental group of students showed 2.58± ±0.48 AP for males and 2.63 ± 0.31 AP for females, by the end of the training period the value of AP was reduced to 2.26 ± 0.28 and 2.23 ± 0.35, respectively (p <0.05), which indicates an increase in the level of adaptation. The students of the control group had the value of the adaptive capacity of girls increased from 2.21 ± 0.3 to 2.49 ± 0.53, which indicates the development of stress adaptation to the results of a satisfactory level. To see the role of the vascular component in providing physiological training effect on the students in both groups we performed a reovasography study of the lower limbs blood flow at the beginning and end of the year. In the control group of students we observed little change of the indicators. After a year of dances of the most pronounced increase was pulse blood filling - it moderately increased in all segments. The rate of blood flow through the arteries of the large calibre moderately increased in the legs. The rate of blood flow through the arteries of medium and small calibres increased in all segments. Thus, in general, we observe the improvement of the peripheral blood flow in the lower limbs due to acceleration of blood flow. All this contributes to the normalization of tissue metabolism. The mechanism of change detection is apparently related to both the influence of the training process of the nervous system and optimisation of vasomotor mechanisms and local myogenic effects of physical activity on the vascular status and local blood circulation. According to the study, the adaptation potential of students engaged in collective dance in pairs improved by the end of the year, while the girls of the control group indicated their deterioration. Dance classes help to improve peripheral blood flow in the lower limbs due to acceleration of blood flow, resulting in the increase of pulse blood filling and speed of blood flow in arteries of medium and small calibres in all segments, a moderate increase in blood flow velocity in the arteries of large caliber in the lower legs.