72h模拟失重对男性心理旋转速度的影响

Effect of 72h weightlessness simulation on processing

目的通过72h-6。头低位卧床（HDT）模式，探讨模拟失重条件对心理旋转加工速度的影响，为进～步揭示失重造成的认知功能变化提供依据。方法16名健康男性被试在72h模拟失重条件下（9：00至第4天21：00，从第1天21：00开始卧床），采用自身前后对照设计，分别在每日早9：00与晚21：00进行手型图片心理旋转测试（共8次），分析比较心理旋转速度随模拟失重时间的变化。结果以每个时间点每名受试者的心理旋转反应时为自变量，旋转角度为因变量进行线性回归分析，表明随着模拟失重时间的延长，代表非旋转阶段加工速度的截距（回归方程常数项）增大，但差异无统计学意义（F（3,14）=0．551，P=0．650）；代表旋转阶段加工速度的斜率（回归方程的回归系数）增大，且差异有统计学意义（F（3,14）=4．338，P：0．009）。截距和斜率均在HDT3d中呈现倒“U”型，且在第2天达到最大。结论模拟失重能影响个体的心理旋转速度，并且对旋转阶段加工速度的影响尤为明显。

Objective To explore the effect of weightlessness simulation on processing speed of mental rotation of males in 72 h head-down tilt, in order to further reveal human performance changes caused by weight- lessness. Methods During 72 h weightlessness simulation （ 9 am day 1 to 9 pm day 4, head-down tilt started from 9 pm day 1 ）, 16 male subjects were processed speed of rotation data by ＂ hand＂ picture mental rotation （ test 8 times） ,using self cross-references design,and the variation of processing speed of mental rotation by duration was analyzed. Results The linear regression analysis showed, the reaction time of each time point for each subject as the independent variable, the angle Of rotation as the dependent variable, with the extension of simulated weightless- ness time. The intercept （constant term of the regression equation） , indicating the processing speed of non-rotation, were gradually increased with HDT time,but didnl reached significantly difference （F（3,14） = 0. 551, P = 0. 650） ; the slope （ Regression coefficient of the regression equation） , indicating the processing speed of rotation, were grad- ually increased with HDT time, and reached the significantly difference （（3,14）= 4. 338, P= 0.009）. The value of intercept and slope was like upside-down U in three days, and reached the highest value at day 2. Conclusion Weightlessness simulation have affection on the speed of mental rotation, especially on the rotation speed.