Initial Mechanism of Shear in Comfortable Sitting on a Chair-Examination by the Time Element of Displacement of Seat Pressure Distribution-
Initial Mechanism of Shear in Comfortable Sitting on a Chair-Examination by the Time Element of Displacement of Seat Pressure Distribution-
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舒适坐在椅子上时剪切的初始机制-通过座椅压力分布位移的时间要素进行检查-
DOI：
10.1589/rika.22.185
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发表时间：
2007
影响因子：
--
通讯作者：
Susumu Watanabe
中科院分区：
文献类型：
--
作者：
K. Kobara;A. Eguchi;Daisuke Fujita;T. Nishimoto;Y. Ishiura;Susumu Watanabe
本研究的目的是验证椅子舒适坐姿中剪切力的初始机制。以10名健康男性为研究对象，采用压力分布仪测量了在“有”和“没有”靠背两种情况下，躯干后倾时坐压分布的位移宽度以及与靠背接触至坐压中心位置开始移位的时间差。结果表明：随着躯干向后倾斜，坐压中心位置逐渐向后移动，在“有”靠背情况下，坐压中心位置在倾斜后刚刚向前移动（0.2±0.1秒）。有“靠背”和无“靠背”时的位移宽度分别为基底位前移0.5±1.2 cm和后移2.0±1.1 cm，差异有统计学意义（p<0.01）。这些结果表明，在剪切力的产生过程中，靠背的介入是必不可少的。
The purpose of this study was to verify the initial mechanism of shear force in comfortable sitting position on chair. With 10 healthy men as subjects, we measured the displacement width of sitting pressure distribution with trunk backward inclining and the time difference from contact with the backrest until the beginning of the shift of the sitting pressure center position under two conditions of “with” and “without” backrest using a pressure distribution meter. The results show that the sitting pressure center position gradually moves backwards with trunk backward inclining, and in the case of “with” backrest turned forward just after the inclining (0.2 ± 0.1 sec). The displacement width was a shift forward from the base sitting position of 0.5 ± 1.2 cm “with” backrest and a shift backward of 2.0 ± 1.1 cm “without” backrest, showing a significant difference between them (p<0.01). These results suggest the intervention of backrest is indispensable in the initiation of shear force.