模拟失重状态对健康人视觉诱发电位的影响

Influence of stimulated weightless on visual evoked potential of healthy people

目的了解模拟失重状态下健康人视觉诱发电位的变化。方法选取男性健康志愿者6名,于-6°头低位卧床模拟失重状态第2天、第5天及受试前测量双眼在不同空间频率下的视觉诱发电位P100波。结果不同空间频率下,视觉诱发电位P100波潜伏期在受试前后无明显差异,P100波波幅在高空间频率下有显著下降,具有统计学意义(P<0.01),在中空间频率及低空间频率下无显著性改变。结论模拟失重状态可导致高空间频率下的视觉诱发电位改变,提示失重对于正常人视功能可能存在一定的影响。

Objective To observe the influence of head-down tilt on visual evoked potential.Methods 6 healthy volunteers were exposed to-6° head-down tilt.The visual evoked potential was measured before test,the second day and the fifth day after the test under different space frequency.Results No significant difference was found in the latency of P100 before and after the test.The amplitude of P100 had significant change under high space frequency.But the same did not happen on intermediate and low space frequencies.Conclusion Head-down tilt can induce the change of visual evoked potential under high space frequency,which means that the weightlessness may influent the visual function.