进驻高原青年强运动负荷前后QT离散度变化的研究

CHANGES OF Q—T DISPERSION OF YOUTH BEFORE AND AFTER STRONG EXERCISES IN LIHGLAND (3 000m)

目的：了解强运动负荷对进驻高原青年ＱＴｄ各参数的影响，进而探讨强化训练时的心肌氧供和心功能状态；方法：选择海拔３００ｍ地区施工的男性青年战士６４名，采用三导同步１２导联心电图，在强运动负荷前后对比观测ＱＴｄ、ＪＴｄ、ＱＴｃｄ、ＪＴｃｄ与Ｒ波振幅、ＱＲＳ间期等指标，判定其统计学意义；结果：①运动前ＱＴｄ各参数与平原健康人比较即显著增大；②运动后ＱＴｄ、ＱＴｃｄ、ＪＴｃｄ进一步增大，与运动前比较差异极显著（Ｐ＜０．０１）；③运动后Ｒ波振幅、ＱＲＳ间期、ＳＴ段呈阴性变化。结论：人在高原，心脏即处于乏氧状态，强运动负荷加剧了高原青年的心肌缺氧状态。

 Objective:To study changes on QTd of youth exposed to 3 000m highland before and after strong exercises.Methods:64 healthy youth subjects,(male,age rang from 19 to 30 years old)were examined with QTd,JTd,QTcd,JTcd,R wave amplitude and QRS time in one month postaltitude using a 12 channal cardiogram set before-after strong exercises.Results:Level of all parameter in QTd increased markedly in altitude youth before exercise compared with sea level.QTd,QTcd and JTcd increased progressively after exercise at altitude,and there was a greatly difference between twice exercises(P<001).NO chenges in R amplitude,QRS time and ST segment after exercises.Conclusions:The heart function and its reserve capacity of healthy youth exposed to altitude for short time(one month,in this report) would develope not a greaty change although the increased heart load and altitude hypoxia.