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目的研究模拟飞行任务负荷所致的疲劳状态对不同倾斜方位动态姿势调节能力的影响,并筛选出对任务负荷敏感的姿势调节方位与指标。方法从第四军医大学2013级男性本科学员中选取符合条件的42名学员,随机均分任务负荷组与对照组,每组21人。任务负荷组学员持续进行2 h的任务负荷操作,而对照组则不进行此操作任务。所有学员在任务开始前与结束后进行主观疲劳感评分、反应能力测试及不同方位的动态姿势调节能力测试。结果 2 h的任务负荷后,学员对操作任务负荷的主观疲劳感明显升高(F=14.094,P=0.01),反应任务的单位时间正确率明显下降(F=23.716,P<0.01),而单位时间的错误率却明显升高(F=18.134,P<0.01)。在模拟飞行疲劳作用下,机体在向前倾位点调节的精确度明显变差(t=2.117,P=0.040),而向左前倾位点调节时,不仅调节的精度明显变差(t=3.982,P=0.001),姿势稳定能力也明显下降(t=3.288,P=0.002),而所需的调节时间却明显减少(t=2.460,P=0.018)。与对照组相比,学员将身体移动到左倾位点、左后倾位点及右倾位点时,其姿势稳定性同样明显下降,但姿势调节的精度与时间并没有明显的改变。结论机体向左侧区域相关位点的调节稳定性指标对模拟飞行认知操作任务负荷所致疲劳状态最为敏感。因此,该试验证实了动态立位平衡功可以为任务负荷所致的疲劳状态评估提供一种新的手段。
Objective To study the influence of fatigue state caused by simulated flight mission load on the dynamic attitude adjustment ability of different tilt azimuths, and select the orientation and index of posture adjustment sensitive to task load. Methods Forty - two eligible students from 2013 male undergraduates of the Fourth Military Medical University were randomly divided into task load group and control group with 21 in each group. Task load group of students continued for 2 hours of task load operation, while the control group does not carry out this task. All participants performed subjective fatigue score, reaction ability test and dynamic posture adjustment test in different directions before and after the task. Results Subjective fatigue was significantly increased (F = 14.094, P = 0.01) and reaction unit time (F = 23.716, P <0.01) after 2 hours of task load The error rate per unit time was significantly higher (F = 18.134, P <0.01). Under the simulated flight fatigue, the accuracy of the body adjustment at the forward lean point was significantly worse (t = 2.117, P = 0.040), while not only the accuracy of the adjustment was significantly worse when adjusted to the leftward lean point (t = 3.982, P = 0.001). Postural stability was also significantly reduced (t = 3.288, P = 0.002), while the required adjustment time was significantly reduced (t = 2.460, P = 0.018). Compared with the control group, when the participants moved their bodies to the left leaning point, the left leaning position and the right leaning position, their posture stability also dropped significantly, but the accuracy and time of posture adjustment did not change significantly. Conclusion The adjustment stability index of the relevant sites to the left of the body is the most sensitive to the fatigue caused by the task load of simulated flight. Therefore, this experiment confirms that the dynamic standing balance work can provide a new measure for fatigue status assessment caused by task load.