Biomechanics and Spine Research Group, Centre for Biomedical Technologies, Queensland University of Technology, Australia.
Biomechanics and Spine Research Group, Centre for Biomedical Technologies, Queensland University of Technology, Australia.
Clin Biomech (Bristol). 2023 Dec;110:106130. doi: 10.1016/j.clinbiomech.2023.106130. Epub 2023 Oct 20.
With increasing global interest in sleep hygiene, sleep ergonomics is an area that has been largely understudied. During sleep individuals turn over during the night to restore blood flow in occluded blood vessels, indicating that control of local tissue pressure may play a role in improving sleep comfort. This study investigates the influence of mattress stiffness on tissue compressive stresses during supine lying.
A subject-specific 3D finite element (FE) model of the pelvis area has been developed to simulate supine lying on substrates of varying firmness. Constitutive parameters for the adipose-skin tissue and muscle-organ tissue were calibrated using a novel application of the inverse finite element method.
The compressive stress was consistently greatest in the muscle interfacing the sacrum at 18.5 kPa on the soft foam, and 30.9 kPa on the firm foam. From soft to firm, the compressive stress increased by 67% at the sacrum, 20% at the ischium, 42% at the lesser trochanter, and 50% at the skin.
The non-linearity of the foam substrate had a pressure distributing effect, relieving the peak compressive stresses at the sacrum, indicating that it may be possible to design arrays of foam substrates that can provide most efficient pressure relief.
随着人们对睡眠卫生的兴趣日益增加，睡眠人体工程学是一个尚未得到充分研究的领域。在睡眠期间，个体在夜间翻身以恢复被阻塞的血管中的血液流动，这表明控制局部组织压力可能在改善睡眠舒适度方面发挥作用。本研究调查了床垫硬度对仰卧位时组织压缩应力的影响。
已经开发了一个特定于主体的骨盆区域的三维有限元（FE）模型，以模拟在不同硬度的基底上的仰卧位。使用反有限元方法的新应用对脂肪 - 皮肤组织和肌肉 - 器官组织的本构参数进行了校准。
在软泡沫上，与骶骨接触的肌肉中的压缩应力始终最大，为 18.5 kPa，在硬泡沫上为 30.9 kPa。从软到硬，骶骨处的压缩应力增加了 67%，坐骨处增加了 20%，小转子处增加了 42%，皮肤处增加了 50%。
泡沫基底的非线性具有压力分布效果，缓解了骶骨处的峰值压缩应力，表明可能设计出能够提供最有效压力缓解的泡沫基底阵列。
