Effects Of Heavy Load Training On Cardiac Function And Plasma Endothelin In Male Canoeists

Aims:The study is to evaluate cardiac systolic and diastolic function of Chinese male canoeists during heavy load exercise training using Doppler-echocardiography,to invesitigate the changes of plasma endothelin(ET) in male canoeists during heavy load exercise training,to analyze the relationship between myocardial function parameters and the plasma concentration of ET in these athletes,which may provide a valuable laboratory plasma marker for monitor the cardiac function of athletes in training practice.Aim of this work is to explore impacts of heavy load exercise training on the endocrine function and the ejective function of circulatory system in male canoeists,which may provide the theoretical basis for medical supervision of training,scientific selection of talent and scientific training for canoeists.Methods:The subject are eighteen healthy male canoeists,who came from Wuhan institute of physical education.Young elite canoeists(A,n=9)and non-elite canoeists (B,n=9)were tested. We measured LV ejective fraction,â–³%D,the E/A ratio,VP before and after five weeks of heavy load exercise training via Doppler-echocardiography at rest,heart rate were measured as well.During this period ,plasma ET were measured in each week.Results:The result of LVEF,â–³%D and VP were above basal condition,and mean heart rate were at low level in group A before the heavy load exercise training. A linear regression relationship was found between HR and LVEF in group A(r=-0.615,p<0.01).After the heavy load exercise training there were no significant differences in LVEF,â–³%D and VP , but the E/A ratio reduced in group A at the same time(p<0.05).The E/A ratio of less than 1 were founded in 2 high-level athletes. After 1 week training,the plasma...