Author(s)

Jizu Shi, Bin Yin, Jing Fan and Ming Yang

Corresponding Author

Jizu Shi

Abstract

Objective: this assay discusses the effect of High-training Low(HiLo)for speed skaters’ endocrine index which includes Serum Testosterone(T),Serum Cortisol(C),and Ratio of Serum Testosterone to Cortisol(T/C).Methods:16 national master man of speed skaters was picked out and divided randomly into Experimental Group(EG) and Control Group(CG). Each Group had 8 people. Experimental Group lived in a simulated altitude of 2300 meters, while Control Group lived in normal oxygen environment. Both Experimental Group training and Control Group training was conducted in normal oxygen environment. The difference of HiLo and Low-training Low (LoLo) before,4 weeks during, and 3 weeks after are compared. Results:1) T of HiLo increased by 9% compared with before entering the cabin, increased by 5.94% compared with LoLo.2) C of HiLo decreased by 25.95% compared with before entering the cabin, decreased by 21.5%(p<0.01) compared with LoLo. It decreased by 14.2%(p<0.05) in leaving the cabin week 2 compared with before entering the cabin.3) T/C of HiLo increased by 46.1%, 23.07% in during the cabin week 4, leaving the cabin week 2 compared with before entering the cabin. It increased by 33.3%(p<0.01) compared with LoLo. Conclusion: HiLo has little significant effects to T for men speed skaters. C is sensitive to low oxygen environment. The decrease of C result in the increase of T/C in week 4 in 4 weeks during. The effect of T and C caused by hypoxic environment disappeared in leaving the cabin week 3.

Keywords

HiLo; men athletes; speed skaters; serum testosterone; serum cortisol; ratio of serum testosterone to serum cortiso