Dynamic stiffness and transmissibility of commercially available wheelchair cushions using a laboratory test method
Dynamic stiffness and transmissibility of commercially available wheelchair cushions using a laboratory test method
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DOI：
10.1682/jrrd.2011.02.0023
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Boninger, Michael L.
中科院分区：
文献类型：
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作者：
Garcia-Mendez, Yasmin;Pearlman, Jonathan L.;Boninger, Michael L.
有证据表明，轮椅（WC）使用者在使用WC期间暴露于不健康的振动水平。与振动暴露相关的健康风险包括椎间盘退化和背痛，这可能会因此降低厕所使用者的功能和独立性。一些证据表明，厕所中使用的垫子可能会放大振动，尽管文献中没有确凿的证据。本研究使用两种实验室测试方法评估并比较了市售WC衬垫的传输率：（1）当人类受试者在具有不同衬垫的道路上推动WC时直接测量传输率，以及（2）使用材料测试系统（MTS）对衬垫进行表征结合人体表观质量的数学模型。结果表明，尽管可以使用MTS对WC缓冲垫进行动态表征，但结果与WC路面中获得的传递率没有很好的相关性。在测试的垫子之间发现了传输率的显著差异，其中基于空气的垫子具有比基于泡沫或凝胶的垫子更低的传输率。
Evidence suggests that wheelchair (WC) users are exposed to unhealthy levels of vibration during WC use. Health risks associated with vibration exposure include vertebral disc degeneration and back pain, which may consequently decrease the function and independence of WC users. Some evidence suggests that the cushions used in WCs may amplify vibrations, although conclusive evidence has not been presented in the literature. This study evaluated and compared the transmissibility of commercially available WC cushions with two laboratory test methods: (1) direct measurement of transmissibility while human subjects propelled a WC over a road course with different cushions and (2) characterization of cushions with a material testing system (MTS) combined with mathematical models of the apparent mass of the human body. Results showed that although dynamic characterization of WC cushions is possible with an MTS, the results did not correlate well with the transmissibility obtained in the WC road course. Significant differences were found for transmissibility among the cushions tested, with the air-based cushions having lower transmissibility than the foam- or gel-based cushions.