Hemodynamic status of prepubertal and pubertal hockey players

© 2015, Pleiades Publishing, Inc. The study of the properties of hemodynamics in 11- to 15-year-old hockey players depending on their age and puberty stages and comparison of its parameters with the parameters of non-athletes of the same age has made it possible to ascertain that regular muscle training has the dominant effect on the functional state of the cardiovascular system (CVS) in prepuberty and puberty. It has been shown that in hockey players a decrease in heart rate (HR) and an increase in the stroke volume (SV) with age result in a significant increase in systolic blood pressure (BPs) at the age of 11–14 years and a progressive increase in total peripheral vascular resistance (TPVR), in contrast to significantly lower values in the control group. Quick adaptation of the CVS to graded physical activities at the age of 11–13 years leads to an enhancement of vascular spasmodic reactions, while SV remains constant. Adolescent hockey players have been found to have steadily high values of SV and BPs; at the same time, maximal values of HR, cardiac output (CO), and diastolic blood pressure (BPd) were observed at puberty stages 1 and 2, and; by stage 3, these parameters decreased, in contrast to the adolescents who did not do go in for sport, in whom the dynamics of these parameters has an opposite direction. This may be evidence of the stress effect of physical activities resulting in the adaptive reactions of the CVS, rather than pubertal changes in its functional activity

Puberty changes of haemodynamics in boys-athletes

The article describes the results of haemodynamics studies in hockey players aged 11-15 with regard to the stages of sexual maturation and their comparison characteristics with indicators of the boys from control class who do physical activity in terms of comprehensive secondary school. It has been shown that systematic muscle exercises have dominant effect on functional state of cardiovascular system in athletes in the prepubertal and pubertal periods of the development of their organisms; it is observed invariably high stroke volume of blood and systolic arterial pressure; maximum frequency indices of heart beats, volume of blood per minute and diastolic arterial pressure are observed at the 1-st and 2-nd stages of puberty, and minimum - at the 3-d stage, as distinct from the children of control class, whose parameter data dynamics has opposite direction. It may indicate to stress character of physical overactivity by effect of which the adaptive responses of cardiovascular system predominate over puberty change of its functional activity

Evaluation of sympathoadrenal system and adrenal cortex functional activity among children in the age and sexaspects

© 2016, International Journal of Pharmacy and Technology. All rights reserved.The study of relationship between sympathetic-adrenal and pituitary-adrenal systems at the level of the whole organism in ontogenesis is a little-studied problem which has a general biological significance. A comprehensive study of regulatory system functional state of modern schoolchildren will expand the understanding of the neuroendocrine mechanisms of their age development and puberty, which is very important for the scientific foundation of the health care system among younger generation. The aim of research was a comprehensive study of the age and sex characteristics of the sympathetic-adrenal system and the adrenal cortex, the ratio of their functional activity among 10-15 year old boys and girls. The observation among children lasted for 6 years continuously. The content of adrenaline and noradrenaline in daily urine based on fluorimetric method showed the state of the sympathetic-adrenal system. The functional status of the adrenal cortex was assessed by urinary excretion of 17- ketosteroids and 17-oxycorticosteroids using a colorimetric method based on Zimmermann reaction with mdinitrobenzene and and by the reaction with phenylhydrazine after enzymatic hydrolysis (Silber's and Porter's method). The statistical significance of differences was determined by Student's t-criterion. It was shown that the daily excretion of adrenaline varies slightly among the children of both sexes, while the dynamics of norepinephrine is more pronounced and oscillatory in nature, which is consistent with the concept of chromaffin tissue earlier maturation relative to sympathetic innervation in ontogenesis. At the same time they revealed multidirectional changes in the excretion of 17-ketosteroids and 17-oxycorticosteroids among 11-13 year old boys, reflecting the biological antagonism of androgens and glucocorticoids, which have protein-anabolic and catabolic effects on a body. A certain synchronicity was established in the manifestation of the mediator link functional activity of the sympathetic-adrenal system, androgen and glucocorticoid function of the adrenal cortex, which is manifested heterochronically in sex groups among 10- 12 year old girls, and 14-15 year old boys. This confirms the literature data on the presence of close functional relationship between catecholamines and corticosteroids at different levels of neurohumoral regulatory mechanism and shows the features of adaptive reactions of children during prepubertal and pubertal development

Reaction of the adrenal cortex to graded exercise in children with different initial tonus of the autonomic nervous system

It was found that the response of the adrenal cortex to graded bicycle exercise in children depends on the initial autonomic tonus and is adequate to the background excretion level of hormone metabolites. Seven-year-old sympathotonic girls with increased excretion of 17-hydroxycorticosteroids at rest demonstrated the lowest increase in this parameter after exercise in comparison with more pronounced increment in vagotonics with relative low initial level of glucocorticoid metabolites. Enhanced excretion of glucocorticoid metabolites with a decrease in androgens observed in 9-year-old sympathotonic girls attests to predominance of catabolic processes over anabolic ones and low efficiency of switching from muscle exercise to recovery in children. © 2013 Springer Science+Business Media New York

Hemodynamic status of prepubertal and pubertal hockey players

© 2015, Pleiades Publishing, Inc. The study of the properties of hemodynamics in 11- to 15-year-old hockey players depending on their age and puberty stages and comparison of its parameters with the parameters of non-athletes of the same age has made it possible to ascertain that regular muscle training has the dominant effect on the functional state of the cardiovascular system (CVS) in prepuberty and puberty. It has been shown that in hockey players a decrease in heart rate (HR) and an increase in the stroke volume (SV) with age result in a significant increase in systolic blood pressure (BPs) at the age of 11–14 years and a progressive increase in total peripheral vascular resistance (TPVR), in contrast to significantly lower values in the control group. Quick adaptation of the CVS to graded physical activities at the age of 11–13 years leads to an enhancement of vascular spasmodic reactions, while SV remains constant. Adolescent hockey players have been found to have steadily high values of SV and BPs; at the same time, maximal values of HR, cardiac output (CO), and diastolic blood pressure (BPd) were observed at puberty stages 1 and 2, and; by stage 3, these parameters decreased, in contrast to the adolescents who did not do go in for sport, in whom the dynamics of these parameters has an opposite direction. This may be evidence of the stress effect of physical activities resulting in the adaptive reactions of the CVS, rather than pubertal changes in its functional activity

Hemodynamic status of prepubertal and pubertal hockey players

© 2015, Pleiades Publishing, Inc. The study of the properties of hemodynamics in 11- to 15-year-old hockey players depending on their age and puberty stages and comparison of its parameters with the parameters of non-athletes of the same age has made it possible to ascertain that regular muscle training has the dominant effect on the functional state of the cardiovascular system (CVS) in prepuberty and puberty. It has been shown that in hockey players a decrease in heart rate (HR) and an increase in the stroke volume (SV) with age result in a significant increase in systolic blood pressure (BPs) at the age of 11–14 years and a progressive increase in total peripheral vascular resistance (TPVR), in contrast to significantly lower values in the control group. Quick adaptation of the CVS to graded physical activities at the age of 11–13 years leads to an enhancement of vascular spasmodic reactions, while SV remains constant. Adolescent hockey players have been found to have steadily high values of SV and BPs; at the same time, maximal values of HR, cardiac output (CO), and diastolic blood pressure (BPd) were observed at puberty stages 1 and 2, and; by stage 3, these parameters decreased, in contrast to the adolescents who did not do go in for sport, in whom the dynamics of these parameters has an opposite direction. This may be evidence of the stress effect of physical activities resulting in the adaptive reactions of the CVS, rather than pubertal changes in its functional activity

Puberty changes of haemodynamics in boys-athletes

The article describes the results of haemodynamics studies in hockey players aged 11-15 with regard to the stages of sexual maturation and their comparison characteristics with indicators of the boys from control class who do physical activity in terms of comprehensive secondary school. It has been shown that systematic muscle exercises have dominant effect on functional state of cardiovascular system in athletes in the prepubertal and pubertal periods of the development of their organisms; it is observed invariably high stroke volume of blood and systolic arterial pressure; maximum frequency indices of heart beats, volume of blood per minute and diastolic arterial pressure are observed at the 1-st and 2-nd stages of puberty, and minimum - at the 3-d stage, as distinct from the children of control class, whose parameter data dynamics has opposite direction. It may indicate to stress character of physical overactivity by effect of which the adaptive responses of cardiovascular system predominate over puberty change of its functional activity

Hemodynamic status of prepubertal and pubertal hockey players

© 2015, Pleiades Publishing, Inc. The study of the properties of hemodynamics in 11- to 15-year-old hockey players depending on their age and puberty stages and comparison of its parameters with the parameters of non-athletes of the same age has made it possible to ascertain that regular muscle training has the dominant effect on the functional state of the cardiovascular system (CVS) in prepuberty and puberty. It has been shown that in hockey players a decrease in heart rate (HR) and an increase in the stroke volume (SV) with age result in a significant increase in systolic blood pressure (BPs) at the age of 11–14 years and a progressive increase in total peripheral vascular resistance (TPVR), in contrast to significantly lower values in the control group. Quick adaptation of the CVS to graded physical activities at the age of 11–13 years leads to an enhancement of vascular spasmodic reactions, while SV remains constant. Adolescent hockey players have been found to have steadily high values of SV and BPs; at the same time, maximal values of HR, cardiac output (CO), and diastolic blood pressure (BPd) were observed at puberty stages 1 and 2, and; by stage 3, these parameters decreased, in contrast to the adolescents who did not do go in for sport, in whom the dynamics of these parameters has an opposite direction. This may be evidence of the stress effect of physical activities resulting in the adaptive reactions of the CVS, rather than pubertal changes in its functional activity

Puberty changes of haemodynamics in boys-athletes

The article describes the results of haemodynamics studies in hockey players aged 11-15 with regard to the stages of sexual maturation and their comparison characteristics with indicators of the boys from control class who do physical activity in terms of comprehensive secondary school. It has been shown that systematic muscle exercises have dominant effect on functional state of cardiovascular system in athletes in the prepubertal and pubertal periods of the development of their organisms; it is observed invariably high stroke volume of blood and systolic arterial pressure; maximum frequency indices of heart beats, volume of blood per minute and diastolic arterial pressure are observed at the 1-st and 2-nd stages of puberty, and minimum - at the 3-d stage, as distinct from the children of control class, whose parameter data dynamics has opposite direction. It may indicate to stress character of physical overactivity by effect of which the adaptive responses of cardiovascular system predominate over puberty change of its functional activity

Puberty changes of haemodynamics in boys-athletes

The article describes the results of haemodynamics studies in hockey players aged 11-15 with regard to the stages of sexual maturation and their comparison characteristics with indicators of the boys from control class who do physical activity in terms of comprehensive secondary school. It has been shown that systematic muscle exercises have dominant effect on functional state of cardiovascular system in athletes in the prepubertal and pubertal periods of the development of their organisms; it is observed invariably high stroke volume of blood and systolic arterial pressure; maximum frequency indices of heart beats, volume of blood per minute and diastolic arterial pressure are observed at the 1-st and 2-nd stages of puberty, and minimum - at the 3-d stage, as distinct from the children of control class, whose parameter data dynamics has opposite direction. It may indicate to stress character of physical overactivity by effect of which the adaptive responses of cardiovascular system predominate over puberty change of its functional activity