Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Biomed Eng Online. 2011 Nov 30;10:103. doi: 10.1186/1475-925X-10-103.
A proper sleep system can affect the spine support in neutral position. Most of the previous studies in scientific literature have focused on the effects of customary mattresses on the spinal alignment. To keep the spine in optimal alignment, one can use sleep surfaces with different zonal elasticity, the so called custom-made arrangements. The required stiffness of a sleep surface for each individual can be obtained by changing this arrangement applying the experimental method and modeling.
In experimental part, the coordinate positions of the markers mounted on the spinous processes of the vertebrae of 25 male volunteers were registered in frontal plane through the optical tracking method and so the spinal alignment was obtained in lateral sleep position on soft and firm surfaces and on the best custom-made arrangement. Thereupon the π-P₈ angles were extracted from these alignments and then were compared with each other. In modeling part the anthropometric data of four different types of volunteers were used. And then the models built in BRG.LifeMOD (ver. 2007, Biomechanics Research Group, Inc., USA) based on these data and in accordance with the experimental tests, were analyzed.
The one way ANOVA statistical model and the post hoc tests showed a significant difference in the π-P₈ angles between soft & custom-made and soft & firm mattresses at the p = 0.001 level and between firm & soft mattresses at the p = 0.05 level. In modeling part, the required stiffness of the sleep surface for four weight-dimensional groups was acquired quantitatively.
The mattress with a custom-made arrangement is a more appropriate choice for heavier men with pronounced body contour. After data fitting, it was observed that the variations of spinal alignment obtained from both methods have the same trend. Observing the amount of required stiffness obtained for the sleep surface, can have a significant effect on keeping the spine healthy.
合适的睡眠系统可以影响中立位脊柱支撑。科学文献中的大多数先前研究都集中在常规床垫对脊柱排列的影响上。为了保持脊柱的最佳排列，可以使用具有不同区域弹性的睡眠表面，即所谓的定制安排。可以通过改变这种布置应用实验方法和建模来获得每个个体所需的睡眠表面的刚度。
在实验部分，通过光学跟踪方法在额状面记录安装在椎骨棘突上的标记的坐标位置，从而获得在柔软和坚硬表面以及最佳定制安排上侧卧时的脊柱排列。然后从这些排列中提取 π-P₈ 角，然后彼此进行比较。在建模部分，使用了四种不同类型志愿者的人体测量数据。然后，根据这些数据并根据实验测试，在 BRG.LifeMOD（版本 2007，Biomechanics Research Group，Inc.，USA）中构建了基于这些数据的模型并进行了分析。
单向方差分析统计模型和事后检验表明，在软质和定制床垫之间以及在软质和硬质床垫之间的 π-P₈ 角度存在显著差异，p 值为 0.001，在硬质和软质床垫之间 p 值为 0.05。在建模部分，定量获得了四个体重维度组对睡眠表面所需刚度。
对于具有明显身体轮廓的较重男性，定制安排的床垫是更合适的选择。经过数据拟合，可以观察到两种方法获得的脊柱排列变化具有相同的趋势。观察到所需睡眠表面刚度的变化，可以对保持脊柱健康产生重大影响。
