Patel M, Fransson P A, Lush D, Petersen H, Magnusson M, Johansson R, Gomez S
Department of Otorhinolaryngology Head and Neck Surgery, Clinical Sciences, Lund University, Lund, Sweden.
Acta Otolaryngol. 2008 Sep;128(9):952-60. doi: 10.1080/00016480701827517.
The properties of a foam surface significantly affect body movement variance. Therefore, studies where different kinds of foam have been used may not provide congruent results.
To investigate whether different properties of foam affect body movement variance (32 subjects, mean age 22.5 years) in terms of linear head, shoulder, hip and knee movements. Subjects repeated tests with eyes open and closed, to also determine the effect of vision on the different surfaces.
Body movement was captured on three different foam surfaces and on a control solid surface over 2 min using a Zebris ultrasound measuring system. The foam surfaces were categorized by their firmness as firm foam, medium foam and soft foam.
Body movement variance increased significantly when standing on all foam surfaces compared with the solid surface. However, movement variance was larger when standing on the firm foam compared with the softer foams, except in the anteroposterior total and low frequency ranges. We also found that the body movement pattern differed when standing on foam and firm surfaces, with greater reliance on movements at the knee to give postural stability on foam than on the solid surface. Vision clearly reduced all body movement variances, but particularly within the high frequency range.
泡沫表面的特性会显著影响身体运动的变异性。因此，使用不同种类泡沫的研究可能无法得出一致的结果。
研究不同特性的泡沫在头部、肩部、髋部和膝部的线性运动方面是否会影响身体运动变异性（32名受试者，平均年龄22.5岁）。受试者睁眼和闭眼重复测试，以确定视觉对不同表面的影响。
使用Zebris超声测量系统在三种不同的泡沫表面和一个对照固体表面上记录2分钟的身体运动。泡沫表面根据硬度分为硬泡沫、中泡沫和软泡沫。
与固体表面相比，站在所有泡沫表面上时身体运动变异性显著增加。然而，除了前后总运动和低频范围内，站在硬泡沫上时的运动变异性比软泡沫上更大。我们还发现，站在泡沫表面和固体表面上时身体运动模式不同，在泡沫上保持姿势稳定比在固体表面上更依赖膝部运动。视觉明显降低了所有身体运动变异性，但在高频范围内尤其明显。
