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目的:定量分析健康青年人摇头后静态姿势稳定性的变化,初步探讨摇头刺激对人体前庭脊髓反射功能的影响。方法:28例健康青年人进行静止头位和摇头后的静态姿势描记,计有4种测试条件:①头部直立,睁眼(T1);②头部直立,闭眼(T2);③摇头后,睁眼(T3);④摇头后,睁眼(T4),每种测试条件均静态直立30s。摇头的方法为:头部向下倾30°,以左右方向30°做水平面摇头20 s,频率2 Hz。摇头结束后,头置于正中水平位,分别记录睁眼和闭眼的姿势稳定性。静态姿势描记仪记录不同测试条件下身体直立时足底压力中心晃动的平均速度(sway velocity,SV)为研究参数。结果:本组受试者均未在摇头后发生倾倒。①分析摇头刺激对姿势平衡的影响:睁眼时摇头前后,即T3与T1比较SV增加了(4.60±6.36)%;而闭眼时摇头前后,即T4与T2比较SV增加了(8.86±8.27)%,这两增幅间差异有统计学意义(t=2.759,P<0.01)。②分析视觉在静态和动态头位下维持平衡中的作用:静止头位下,T2与T1比较SV增加了(9.83±5.10)%;摇头后,即T4与T3比较SV增加了(14.05±6.89)%,增幅间差异有统计学意义(t=2.772,P<0.01)。结论:摇头刺激可干扰前庭觉信息传入,影响健康人体的前庭脊髓反射功能,导致静态姿势平衡功能降低,且当视觉同时受到干扰时对姿势平衡的影响更为显著。人体为维持摇头后直立平衡,存在对感觉信息的重新整合机制。
OBJECTIVE: To quantitatively analyze the changes of static posture stability of healthy young people after shaking their heads, and to explore the influence of shaking head stimulation on the reflex function of human vestibular spinal cord. Methods: Twenty-eight healthy young people underwent static head position and static posture post-head shaking. There were four test conditions: ① head upright, eyes open (T1); ② head upright, eyes closed (T2); ③ head shaking (T3); ④ After shaking his head, eyes open (T4), each test condition is static erect 30s. Shook his head as follows: the head tilted 30 ° to the left and right direction 30 ° to do horizontal plane shaking head 20 s, frequency 2 Hz. After shaking his head, the head placed in the median level, respectively, recorded eyes open and closed eyes posture stability. The static posture recording instrument recorded the sway velocity (SV) of the plantar pressure center when the body stood up under different test conditions as the study parameter. Results: None of the subjects in this group fell after shaking their heads. ① Analyze the effect of shaking head stimulation on the balance of posture: Before and after shaking his head when eyes open, the SV increased by (4.60 ± 6.36)% compared with T1; while before and after shaking his head when eyes closed, the SV increased comparing with T4 (8.86 ± 8.27 )%, The difference between the two increases was statistically significant (t = 2.759, P <0.01). (2) Analysis of the role of vision in maintaining balance under static and dynamic head position: Under resting head position, the SV of T2 and T1 increased by (9.83 ± 5.10)%; after shaking head, T4 increased by 14.05 ± 6.89 )%, The difference was statistically significant (t = 2.772, P <0.01). Conclusion: Shaking head may disturb the vestibular afferent information transmission and affect the vestibular spinal reflex function of healthy human body, resulting in the decrease of static posture balance function, and more significant influence on the balance of posture when the vision is disturbed at the same time. Human body to maintain his balance after shaking his head, there is a re-integration of sensory information mechanism.