摘要
目的:探讨低氧训练对优秀女子中长跑运动员心功能的影响。方法:国家女子中长跑队运动员13人随机分为高住高练低训组(HiHiLo组,7人)和低住高练组(LoHi组,6人),两组在每天完成相同的日常平原训练计划的基础上,每周进行3次低氧训练,训练方式为蹬功率自行车,强度为个体80%VO2max,时间40分钟,氧浓度为14.7%左右(相当于海拔2800米高度)。此外,HiHiLo组晚上在低氧房居住10小时,房中空气氧含量为14.7%(相当于海拨2800米高度),LoHi组常氧居住,实验期4周。监测低氧训练前、低氧训练第1、2、3、4周的周一清晨心电图变化,读取心电图∑T/R值;同时取清晨空腹静脉血测定肌酸激酶同工酶CK-MB。结果:HiHiLo组在低氧训练过程中,CK-MB持续下降,低氧训练第1周、2周、3周、4周CK-MB均显著低于实验前(P<0.05),低氧训练第4周亦显著低于低氧训练第1周(P<0.05)。而LoHi组CK-MB则无显著变化。与低氧训练前相比,HiHiLo组和LoHi组心电图∑T/R的变化无显著差异。结果提示低氧训练对心脏功能无不良影响,低氧居住在某种程度上有利于心脏功能的恢复。
Objective To investigate the effects of 4 - week hypoxic training on cardiac function in elite female middle and long distance runners. Methods Thirteen national female middle and long distance runners were divided into HiHiLo group( n = 7) and LoHi group( n = 6) randomly. Both groups performed the daily training program every day and 3 times hypoxic training(at oxygen content 14.7% -simulate altitude of 2800m) at intensity of individual 80%VO2max every week. HiHiLo group stayed in hypoxic chamber with oxygen content of 14.7% (simulate altitude of 2800m) for 10 hours every night, LoHi group lived in normal oxygen content of 21%, and trained for 4 - week. CK - MB in blood serum and ∑T/R of ECG were measured. Results With the progression of hypoxic training, the value of CK - MB showed a decreasing tendency as compared with that before hypoxic exposure in HiHiLo group. It significantly decreased after 4 - week hypoxic training. No significant change was found in LoHi group. Compared with that before hypoxic exposure, no significant change in ∑T/R was found in both groups. Conclusion The hypoxic training had no effect on cardiac function, whereas living in hypoxic condition facilitated the recovery of cardiac function after training.
出处
《中国运动医学杂志》
CAS
CSCD
北大核心
2006年第3期314-316,308,共4页
Chinese Journal of Sports Medicine
基金
国家科技部奥运攻关课题(2003A904B04)资助