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Objects:Hypoxic training which has been seen as an effective method to enhance performance has been widely used in the daily training of many sports.There are more and more research to investigate the theoretical basis of this method.In this study,various indices such as cardiac output,ejection fraction,cardiac output index,artery compliance,were compared before and after HiHiLo to investigate that whether the HiHiLo can improve cardiovascular function.Methods:All the subjects of this study were under graduate students of Beijing Sport University who had exercise training experience.All the subjects participated the HiHiLo (exposure in hypoxic environment for 10 hours at night,training at normoxia in the day time, exercise during hypoxia three times a week lasting for 30 min at 75%Vo2max intensity) training last for 4 weeks.Echocardiography measurements were performed before and after HiHiLo session.Vascular function measurements were performed before HiHiLo,2 weeks and 4 weeks after HiHiLo.Results:1.After HiHiLo,HR decreased in quiet ratherish,decreased in exercise and convalescence significantly;2.After HiHiLo,left ventricle end-diastolic volume（LEDV） increased in larger burthen exercise and convalescence significantly,but left ventricle end-systolic volume（LESV） decreased ratherish in every state;3.After HiHiLo,SV,CO,SI, EF and the bloodstream velocity of the left tract Stroke increased,but only SV,SI and the bloodstream velocity of the left tract Stroke increased significantly;4.After HiHiLo,peak velocity of early filling wave（E）,peak velocity of filling after atrial contraction（A） and E/A ratio declined indicated,but only E decreased significantly in 100W burthen;5.After HiHiLo, SBP,MAP,PP decreased significantly,but DBP did not change significantly;6.After HiHiLo, all PWV decreased,but only lbaPWV decreased significantly;SVC increased significantly and SVR decreased significantly.
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