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目的探讨能否用 Ｑ Ｔ 间期来预测飞行员对＋ Ｇｚ 应激的反应情况。方法３７ 名空军飞行员在人用离心机上经受峰值为４ Ｇ 的正向加速度作用，根据被试者对＋ Ｇｚ 应激反应的不同，将其分成 Ａ组（ 反应良好组，ｎ ＝ １８） 、 Ｂ 组（ 反应亢进组，ｎ ＝ １４） 和 Ｃ 组（ 反应抑制组，ｎ ＝ １） 。实验结束后测量＋ Ｇｚ 作用前、中、后心电图的 Ｑ Ｔ 间期和 Ｒ Ｒ 间期，并对能够测量出 Ｑ Ｔ 间期的３３ 人（８９ ．２ ％ ） 的数据进行统计分析。结果 ＋ Ｇｚ 作用中 Ｑ Ｔ 间期和 Ｒ Ｒ 间期明显缩短， Ｑ Ｔ 间期对 Ｒ Ｒ 间期的敏感性明显增加（ 与＋ Ｇｚ 作用前比， Ｐ＜ ０ ．００１） ； Ａ 组与 Ｂ 组相比，＋ Ｇｚ 作用中 Ｑ Ｔ 间期对 Ｒ Ｒ 间期的敏感性差异显著（ Ｐ＜ ０ ．００１） ；用＋ Ｇｚ 作用中的 Ｑ Ｔ 间期和 Ｒ Ｒ 间期建立的判别方程有效，其总的判别正确率为８１ ．８ ％ 。结论＋ Ｇｚ 作用下 Ｑ Ｔ 间期的改变与自主神经均衡性的变化有关；用心电图的 Ｑ Ｔ 间期和 Ｒ Ｒ 间期通过判别方程可以预测飞行员对＋ Ｇｚ 应激的反应情况，本研究提出的指标和方法有可能在 Ｇ－ Ｌ Ｏ Ｃ 预警系统中得到应用。
Objective To explore whether QT interval can be used to predict pilots response to + Gz stress. Methods 37 air force pilots were subjected to a positive acceleration of 4 G peak on a human centrifuge, and were divided into group A (good response group, n = 18), B Group (hyperactivity group, n = 14) and group C (reaction inhibition group, n = 1). At the end of the experiment, the QT interval and the R R interval were measured before, during and after electrocardiography of + Gz, and the data of 33 persons (89.2%) who could measure the QT interval were statistically analyzed. Results In the + Gz group, the Q T interval and the R R interval were significantly shortened, and the Q T interval was significantly increased in the R R interval (compared with the pre-Gz effect, P <0.001) Compared with the control group, the sensitivity of the QT interval to the R R interval was significantly different (P <0.001) in the + Gz effect; the discriminant equation established between the QT interval and the R R interval in the + Gz effect was effective , The overall accuracy of the discrimination is 81. 8%. Conclusions The changes of QT interval with + Gz are related to the changes of autonomic balance. The response of pilots to + Gz stress can be predicted by the discriminant equation between QT interval and R R interval of electrocardiogram. The indicators and methods are likely to be used in the G-LOC warning system.