The Effect Of Living High Training Low On The Blood Iron Metabolism In Juvenile Midst And Long-distance Running Athletes

ObjectiveThe objective of this study is to observe the effect of Living high training Low on the blood iron metabolism in the juvenile athletes, and hope to provide the basis on whether to supply iron or not during the period of HiLo.MethodEleven healthy, long-distance runners were divided into trial group(n=6) or control group(n=5)randomly, aged 14.6±1.3yr, who all came from Shijing(石景)mountain sports school of Peking City and were sea-level residents. There were no significant differences in age and physical characteristics between both groups before starting the experiment. The trial group lived in the hypoxia camp (4 weeks, 10hr/d) and the oxygen density was 14.7% (corresponding to an altitude of 2700 m), while trained in the normoxia Environment. The control group lived and trained in the sea level. In addition, all subjects participated hypoxia training of the intensity corresponding to 72% VO2max (corresponding to 80% VO2max in hypoxia), 3 times / week on the cycle ergometer, 30 minutes. The samples of vein blood of all subjects were tested four times during the 4 weeks.Conclusion1. According to the findings, the values of Hb were always increasing during the whole experiment,and the range of 8.3%. The control group presented the fluctuation of descending, rising, and descending. So HiLo combining hypoxia training can increase the Hb density .2. HiLo has little effect on the indexes of iron metabolism,So there is no evident difference between groups and within groups. Indicate: Supplying iron should hold the caution attitude when performing HiLo. As teenager is in the growth period, the capability of absorbing iron is very strong. The normal uptake from food can satisfy the demand of iron. On the contrary,the excessive iron supplement is very harmful to the body.3. The reason why some indexes of both groups, such as SI and SF, descended at the beginning of 7 days was the great load of exercise (hypoxia training + normal training) caused that the body utilized the reserved iron and functional iron to satisfy the need of Hb combination. So coaches and scientific researchers should pay more attention to the iron condition, particularly during the initial stage.