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目的分析健康人直立于不同厚度海绵垫时姿势特征的变化,探讨本体觉受到不同程度干扰时的姿势平衡改变。方法 30例健康人分别站立于坚硬平板和不同厚度的海绵垫,海绵厚度依次从1到5块,每块厚度4.7 cm。每种站立平面下,均睁眼和闭眼各站立30 s。应用姿势描记仪记录人体直立时足底压力中心(center of pressure,COP)晃动的相关参数,包括总轨迹长、平均速度、单位面积轨迹长、外周面积、实效值面积、矩形面积。结果所有参数在睁眼和闭眼条件下均有随海绵垫厚度的增加而变化趋势(睁眼时 F 值为9.14～107.18,闭眼时 F 值为32.19～144.35,P 值均<0.0001),除单位面积轨迹长呈减少趋势外,其余参数均为增加趋势;对各参数在不同海绵垫间的差异进行比较,无统计学意义的情况有:①总轨迹长和速度:睁眼及闭眼时,4和5块之间;②单位面积轨迹长:睁眼时,0和1、1和3、2和3、3和4、4和5块之间;闭眼时,3和4、3和5、4和5块之间;③外周面积:睁眼时2和3、3和4、4和5块之间;闭眼时,3和4、3和5、4和5块之间;④实效值面积和矩形面积:睁眼时2和3、4和5块之间;闭眼时,3和4、3和5、4和5块之间。其余比较差异均有统计学意义(P<0.05)或极显著统计学意义(P<0.01)。结论在一定范围内,随着海绵垫厚度增加,直立其上的人体本体觉受到的干扰程度加剧,其姿势稳定性逐渐降低;应用海绵垫干扰本体觉同时,姿势描记仪记录的各参数中,COP 晃动的轨迹长度和平均速度是较适宜描述姿势平衡变化的指标;应用海绵垫对直立人体足底本体觉进行干扰时,应考虑海绵厚度对结果的影响,选择适宜的厚度,以提高其临床应用价值。
Objective To analyze the changes of posture characteristics of healthy people standing up sponge pad with different thickness, and to explore the change of posture balance when the body experiences varying degrees of disturbance. Methods Thirty healthy people stood on hard plates and sponge pads with different thicknesses respectively. The thickness of sponges was from 1 to 5 in succession, each with a thickness of 4.7 cm. Under each standing plane, both eyes open and eyes closed for 30 seconds each. The related parameters of the center of pressure (COP) sloshing, such as the total track length, the average speed, the track length per unit area, the peripheral area, the effective area, and the rectangular area, are recorded by the posture recorder. Results All the parameters showed a trend of increasing with the thickness of the sponge pad under both eyes open and eyes closed (F value was 9.14 ~ 107.18 when eyes opened, F value was 32.19 ~ 144.35 when eyes closed, both P values were less than 0.0001) Except for the decreasing track length per unit area, all the other parameters showed an increasing tendency. The differences of parameters between different sponge pads were compared. There was no significant difference between the two parameters. The total track length and speed: Between 4 and 5 blocks; 2) Length of track per unit area: between 0 and 1, 1 and 3, 2 and 3, 3 and 4, 4 and 5 when eyes open, 3 and 4 when eyes closed, Between 3 and 5, 4 and 5; ③ peripheral area: between 2 and 3, 3 and 4, 4 and 5 with eyes open; with 3 and 4, 3 and 5, 4 and 5 Between; ④ Effectiveness Area and Rectangular area: 2 and 3, 4 and 5 when eyes open; 3 and 4, 3 and 5, 4 and 5 when eyes closed. The remaining differences were statistically significant (P <0.05) or extremely significant (P <0.01). Conclusions With the increase of the thickness of the sponge pad, the degree of disturbance to the body of an erected body aggravates within a certain range, and its posture stability gradually decreases. When the sponge pad interferes with the ontology, the parameters recorded by the posture meter, The path length and average velocity of COP sloshing are more suitable indicators to describe the change of posture balance. When sponge pad is used to interfere with the plantar body sensation of the erect human body, the influence of sponge thickness on the result should be considered and the suitable thickness should be selected to improve its clinical Value.