正常年轻人自动态平衡能力的测量及其影响因素

Test of balance performance of normal adults on dynamic posturography: outcomes and demographic analysis

目的 探索BiodexBalanceSystem(BBS)测试的程序和敏感性 ,分析个体因素对测试结果的影响 ,确定参数的预测值。方法 应用BBS对 13名正常年轻人 ( 18～ 3 5岁 )进行不同系统设置条件下的动态姿势图测量和稳定性测试 ,将测量结果与个体因素进行比较分析。结果 8级闭眼时及稳定性测试的完成时间(LOST)有较好的重测信度 (r =0 .87～ 0 .94,P <0 .0 1)。稳定指数 (SI ,APSI ,MLSI)及采样标准差 (SD ,APSD ,MLSD)闭眼时高于视觉反馈时 (P <0 .0 1) ,并在平台稳定性减少到 4级时明显增大 (P <0 .0 1)。APSI大于ML SI(t=15 .83 8,P =0 .0 0 0 ) ,APSD大于MLSD(t=12 .672 ,P =0 .0 0 0 )。对姿势控制的贡献率视觉为 2 1.7% ,本体感觉为 2 5 .3 % ,前庭感觉最大可达 41.7%。LOST随平台稳定性减少而增加 ,各级别间的差异有非常显著性意义 (P <0 .0 1) ;方向控制能力 (DC)在平台稳定性减少到 4级时明显减少 (P <0 .0 5 )。年龄和体重与大部分参数有相关性 ( |r| =0 .18～ 0 .5 0 ,P =0 .0 45～ 0 .0 0 0 ) ,与SI、MLSI无相关性 ;体重指数与LOST高度正相关 (r =0 .83 ,P =0 .0 0 0 ) ,与平均DC中度负相关 (r =-0 .5 8,P =0 .0 0 0 ) ,身高与LOST中度负相关 (r =-0 .41,P =0 .0 0 1)。男性 8级视觉反馈SI( 1.5 2 0?

Objective To investigate the balance performance of normal adults by use of dynamic posturo graphy and the effect of demographic factors and to calculate the predictive values of various parameters. Methods Thirteen normal adults, 5 male and 8 female, aged 18 to 35 years, were posturographically measured with Biodex Balance System (BBS) in various systemic conditions, and their demographic data were collected for statistical analysis. Results The test retest reliability on eye closed and LOS test was good( r =0.87～0.94, P <0.01). The Stability Index (SI), Anterior/Posterior SI (APSI), Medial/Lateral SI (MLSI), as well as their Standard Deviation (SD), were higher when eyes closed than those when visual feedback was used (eyes open) ( P <0.01), and increase significantly when the force plate stability drop to level 4 ( P <0.01). APSI and its SD were higher than MLSI and its SD, respectively ( t =15.838, 12.672, P <0.001). Vision contributed 21.7%, proprioception 25.5% and vestibule maximum 41.7% to postural control in healthy subjects. With the plate stability level decreasing, the elapsed time (LOST) for subjects to shift their center of gravity to all eight randomly highlighted targets increased significantly ( P <0.01 ), but the Direction Control performance (DC) decreased ( P <0.05) only when the plate stability drop to level 4. Age and weight of the subjects correlated with most of the parameters (|r|=0.18～0.50, P =0.045～ 0.000 ), except SI and MLSI. There also existed strongly positive correlation between Body Mass Index and LOST ( r =0.83 , P =0.001), and moderately negative correlation between BMI and DC ( r =-0.58, P <0.001). But only LOST was negatively correlative with the subjects` height ( r =-0.41, P =0.001). The difference between SI on visual feedback at level 8 and the age normalized predictive value provided by the manufacturer did not exist in male subjects (Z=1.200, P =0.230), but was significant in female subjects ( t =3.927, P =0.006). The sex difference existed in SI, APSI, MLSI and LOST ( F =11.593, 6.567, 16.364, 27.813, P =0.001, 0.012, 0.000 , 0.000 , respectively), but not in DC. Conclusion The decrease of visual and/or proprioceptive information inputs can lead to a decrease of the control of the center of gravity and an increase of the body sway. The BBS is sensitive to show this nature, and thus, may be a useful tool for the quantitative assessment of equilibrium performance.