Effective position of the rotation axis of an ankle stretching machine and the effect of misalignment
Effective position of the rotation axis of an ankle stretching machine and the effect of misalignment
复制标题
踝关节拉伸机旋转轴的有效位置及错位的影响
DOI：
10.1299/jbse.20-00202
复制
发表时间：
2020
影响因子：
--
通讯作者：
Yoji Yamada
中科院分区：
文献类型：
--
作者：
Yuma Shiraishi;S. Okamoto;Naomi Yamada;Koki Inoue;Yasuhiro Akiyama;Yoji Yamada
关节锻炼者的机械旋转轴被认为在与人体关节的生物力学轴匹配时运行得更好。然而，关于脚踝拉伸机的研究很少。此外，旋转轴不对齐的不良影响还不是很清楚。因此，我们使用我们先前研究中开发的气动拉伸机来研究脚踝拉伸机的旋转轴的有效位置以及不对中的影响(Shiraishi等人，2020)。8名健康青年男性(年龄23.3±1.4岁)参加了伸展运动，同时通过安装在脚后跟下的平板改变机器与脚踝之间的旋转轴的相对位置。伸展机对受试者足部进行背屈，记录受试者前足背屈角度和三轴向作用力。采用双因素方差分析和/或回归分析对最大背屈角度下的测量值进行评估。我们确定机器的旋转轴必须放置在外侧踝关节上方7 mm处，因为施加在前足上的法向力和最大背屈角度较大，而摩擦力适中。此外，通过协方差选择，研究了背屈角度与接触力之间的关系。当机器的轴线降低到脚踝以下时，三轴向力明显减小。此外，垂直于鞋底的力对鞋底的背屈角和摩擦力有很大的正向影响，可能会对皮肤造成损害。当机器的轴线在脚踝上方时，旋转轴的不对准增加了鞋底的接触力，或者当机器的轴线低于脚踝时，旋转轴的不对中增加了从拉伸机到使用者脚的力传递的效率。
The mechanical rotation axes of joint exercisers are believed to operate better when they match the biomechanical axes of human joints. However, there are few studies regarding ankle stretching machines. Further, the maleffects of rotation axis misalignments are not well known. Hence, we investigate the effective positions of rotation axes for ankle stretching machines and the effects of misalignments using a pneumatic-driven stretching machine developed in our previous study (Shiraishi et al., 2020). Eight healthy young males (ages 23.3 ± 1.4 years) participated in stretching exercises while the relative positions of the rotation axes between the machine and ankle were changed via plates installed under the heel. The stretching machine dorsiflexed the feet of the participants, and the dorsiflexion angles and three-axial forces applied to the forefeet were recorded. The measured values at the maximum dorsiflexion angle were evaluated by two-way analysis of variance and/or regression analysis. We determined that the rotation axis of the machine must be placed 7 mm above the lateral ankle because the normal force applied to the forefoot and maximum dorsiflexion angle were large, whereas the friction force was moderate. Further, the relationships among the dorsiflexion angle and contact forces were investigated via covariance selection. The three-axial forces significantly decreased as the axis of the machine was lowered below the ankle. Additionally, the force normal to the sole had large positive effects on the dorsiflexion angle and friction force of the sole, which could damage the skin. The misalignment of the rotation axis increased the contact force at the sole when the axis of the machine was above the ankle or decreased the efficiency of force transmission from the stretching machine to the user’s foot when the machine’s axis was below the ankle.
马蹄内翻踝关节拉伸康复机：临床设计与评价
DOI：
10.1109/smc.2017.8122858
发表时间：
2017
期刊：
2017 IEEE International Conference on Systems, Man, and Cybernetics (SMC)
影响因子：
--
作者：
〇Yamada Naomi;Okamoto Shogo;Akiyama Yasuhiro;Isogai Kaoru;Yamada Yoji
通讯作者：
Yamada Yoji
使用支架结构稳定踝关节位置的踝关节推动机构
DOI：
--
发表时间：
2016
期刊：
Journal of Advanced Mechanical Design, Systems, and Manufacturing
影响因子：
--
作者：
Hideki Toda;Takeshi Matsumoto;Ryota Tanizaki;Takehiro Imaeda
通讯作者：
Takehiro Imaeda