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目的:建立倾斜床模拟推拉动作(pushpullmaneuver,PPM)模型,并观察其引发的心血管反应性特点。方法:以10名健康歼击机飞行员为被试者,随机进行3次90°立位(headuptilt,HUT)和90°倒立位(headdowntilt,HDT)体位转换试验,HUT1minHDT10sHUT1min,第2,3次体位转换时HDT的持续时间分别为15s和20s。床体旋转速度为45°/s。间隔4s监测一次血压,连续记录心电图。结果:在HDT(-1Gz)期间,各时间心率犤-1Gz0～10s头低位:(60.7±9.5)次/min,头高位:(85.2±6.4)次/min;-1Gz11～15s头低位:(54.4±6.7)次/min,头高位:(82.7±4.9)次/min;-1Gz16～20s头低位:(54.1±7.8)次/min,头高位:(85.1±5.2)次/min犦和血压较基础HUT犤(90.7±70.1)次/min犦明显下降(P<0.05～0.01)。随后HUT时,除11～15s血压外,其余各时间心率和血压较基础HUT明显下降。结论:采用倾斜床可以模拟推拉动作所引起的心血管反应,故其可作为推拉动作模型。
OBJECTIVE: To establish a pushpullmaneuver (PPM) model of tilted bed and to observe its cardiovascular reactivity. Methods: Ten healthy fighter pilots were randomized to undergo three 90-degree head-tilt (HUT) and 90-degree head-to-head (HDT) body-shift tests. HUT1minHDT10sHUT1min, The duration of HDT is 15s and 20s respectively. Bed rotation speed of 45 ° / s. An interval of 4s to monitor blood pressure, continuous recording of ECG. Results: During the HDT (-1Gz), the head-to-head gout of -0犤Gs for 10 min at each time was (60.7 ± 9.5) min -1 and the peak was (85.2 ± 6.4) min -1; 54.4 ± 6.7) times / min, head high: (82.7 ± 4.9) beats / min; head low of -1Gz16 ~ 20s: (54.1 ± 7.8) beats / min; head high: (85.1 ± 5.2) beats / min; Compared with the baseline HUT 犤 (90.7 ± 70.1) times / min 犦 decreased significantly (P <0.05 ~ 0.01). Subsequent HUT, in addition to 11 ~ 15s blood pressure, the rest of the heart rate and blood pressure at each time significantly lower than the basic HUT. Conclusion: Inclined bed can be used to simulate the cardiovascular reaction caused by the push and pull movements, so it can be used as a model of push and pull motion.