抛物线飞行前、中、后动态心电图的改变

目的了解失重飞机飞行全过程中心电活动的特点。方法记录 1 3名被试者在失重飞机飞行前、中、后的动态心电图 (DCG)。结果飞行前、后心率基本相同 ;失重飞机飞行过程中 ,被试者心率增加 ,最大心率为 1 37.0± 1 2 .2bpm ,最小心率为 57.7± 6.6bpm平均心率为 86.0± 7.3bpm ,高于一般飞行中检出的心率 ;飞行前、后 1 3名被试者心脏节律无明显差异 ;飞行中 ,仅 1例被试者心脏节律较地面训练日稍有变化。 2例在高空失重飞行中 ,ST段呈一过性水平下移≥ 0 .1mV ,1例T波改变 ,但极量活动平板试验阴性。结论DCG可用于评价整个失重飞机飞行期间心脏电活动的改变。

Changes of Dynamic ECG before ,during ,and after Parabolic Flight.

Objective. To study the characteristics of pilots' electrocardiogram during parabolic flight. Method. Dynamic electrocardiogram (DCG, CM1 and CM5 bipolar leads) were recorded in 13 pilots before, during and after parabolic flights. Result. Preflight and postflight values of heart rate (HR) and cardiac rhythm were essentially the same in all cases, but HR increased to a higher level of 86.0 +/- 7.3 bpm with maximum of 137.0 +/- 12.2 bpm, and minimum of 57.7 +/- 6.6 bpm during parabolic flights. During flights, one pilot's cardiac rhythm changed slightly and in another pilot T wave became inverted. In other two pilots, ST segments shifted downward more than 0.1 mV transiently. All these pilots showed negative result in maximal exercise on the ground. Conclusion. DCG could be used to evaluate the changes of cardiac electric activity during the whole parabolic flight.