急性轻、中度缺氧暴露对心理运动及反应时的影响

目的：研究急性轻，中度缺氧暴露对人的心理运动及视觉反应时的影响。方法 利用低压舱模拟300m（对照高度），2800m，3600m,4400m高度缺氧暴露1h，考察了18名健康男性青年被试者指82％和74％，2800m缺氧暴露1h心理运动绩效的各个参数并无显著改变（P＞0．05），3600米缺氧步加重（P＜0．01）。而简单反应时和指测验的绩效暴露于4400米时仍无显著改变（P＞0．05），结论 以上高度时会对选择反应时等复杂反应产生负面影响，且随着主度的增加而加重。

Effects of Acute Exposure to Mild or Moderate Hypoxia on Human Psychomotor Performance and Visual-reaction Time

Objective The aim of this study was to determine whether psychomotor performance and visual reaction time were affected by acute exposure to mild or moderate hypoxia. Method Eighteen healthy male volunteers performed finger tapping, simple reaction time(SRT) and 4 choice reaction time(CRT) tests at simulated altitude of 300 m (control),2800 m, 3600 m and 4400 m for 1 h in a hypobaric chamber. Result SaO 2 decreased from 98%(control) to 90%,82% and 74% respectively at the various altitudes. All the performance parameters showed no significant change after exposure to 2800 m for 1 h relative to ground level(P>0.05). However the mean reaction time of 4 CRT under 3600 m prolonged and performance decreased as compared with baseline value(P<0.05), and the performance decreased further under 4400 m(P<0.01). No significant difference was found in finger tapping and SRT even under exposure to 4400 m for 1 h.Furthermore, no decrease in correct rate were observed at any altitude (P>0.05). Conclusion The results from this study demonstrated that there were no measurable impairment of visual reaction time and psychomotor performance under exposure to an altitude of 2800 m for 1 h. However, adverse effects on psychomotor performance were observed under 3600 m and over.