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目的研究人体在持续工作负荷的脑力疲劳状态下静态平衡能力的变化;评价测试姿势“双足矢状位”和测试方法“NO+反应时”对于疲劳的敏感程度。方法受试者进行4 h的连续脑力负荷作业,分别在时间点0 h,1 h,2 h,3 h和4 h测试静态姿势图、反应时、闪烁临界频率等指标,并进行NASA-TLX量表评定。结果反应时、闪烁临界频率、NASA-TLX量表评分随着工作负荷时间增加,差异具有统计学意义(P<0.05)。静态姿势图指标反映出的晃动逐渐增加,在时间点3 h达到最大(P<0.05),在时间点4h略下降。结论在持续的工作负荷下,静态平衡能力随负荷时间逐渐下降;“双足矢状位”的姿势时,一些重心晃动指标可以在一定程度上反应出疲劳的状态;“NO+反应时”中的静态姿势测试不能敏感地反映志愿者的疲劳状态。
Objective To study the changes of static balance ability of the human body under continuous fatigue workload and to evaluate the sensitivity to fatigue of the test position, “bipedal sagittal” and test method “NO + reaction time”. Methods Subjects were subjected to continuous mental workload for 4 hours. The static postures, reaction time and critical flicker frequency were measured at 0 h, 1 h, 2 h, 3 h and 4 h, respectively. NASA-TLX Scale assessment. The results showed that the critical frequency of flicker, the NASA-TLX scale score with the increase of workload time, the difference was statistically significant (P <0.05). The sloshing reflected by the static posture index gradually increased, reaching the maximum at 3 h (P <0.05) and slightly decreasing at 4 h. Conclusions The static balance ability gradually decreases with the load time under continuous workload. When the “bipedal sagittal position”, some center of gravity slides can reflect the fatigue state to a certain degree. "Static posture test can not sensitively reflect the volunteer’s fatigue state.