超低频振动对人体影响的研究

为研究超低频振动对人的视力、操作能力、胃电图、人体平衡稳定性和主观感觉的影响。实验采用０．２５、０．５、０．６３、０．８和１．０Ｈｚ五个振动频率，并参考之轴振动（头－足向）运动病频率范围，将实验结果按三个频段进行了分析。被试者取半仰卧位。结果表明，视力、操作能力、平衡稳定性不但与频率有关，而且随振动加速度的增加而降低。除视力外，它们随频率变化的规律符合所分频段含义，胃电图主频率改变和主观感觉级测试进一步说明了这一点。０．２５Ｈｚ不仅处在Ｚ轴全身振动的运动病敏感频段，而且也是Ｘ轴全身振动的敏感频率。因此，载人航天飞行中，不仅应避开０．２５Ｈｚ的Ｚ轴全身振动，而且也应避开０．２５Ｈｚ的ｘ轴全身振动。

Study on Effects of Ultralow-frequency Vibration on Human Body X-axis

The effects of ultralow-frequency X-axis vibrations on human vision,operating capacity, stability of body-balance , electrogastrogram(EGG)and subjective sen-sation were studied.Vibration frequencies of 0.25,0.5,0. 63,0. 8 and 1.0H;were used in the experiment.The frequency rang was divided into three frequency bands :the sensitiz-ing band ,the sickening band and the neighbour band of motion sickness ,and the data were-analysed.The subjects were in semi-supine position. The results showed that vision ,operat.ing capacity and stability of body-balance changed with frequency and decreased with the in crease of acceleration. The regularity of their changing with frequency conformed to the meanings of the bands except for vision. The changes in principal frequencies in EGG and the testing of the subjective sensation supported this result.0.25 Hz is not only in the sensi-tive band of Z-axis vibration but also in the sensitive frequency of X-axis vibration.0.25 Hz is suggested to be avoided in space flight.