Instructions limiting the number of steps do not affect the kinetics of the threshold of balance recovery in younger adults
Instructions limiting the number of steps do not affect the kinetics of the threshold of balance recovery in younger adults
复制标题
DOI：
10.1016/j.jbiomech.2007.03.012
复制
发表时间：
2007-01-01
影响因子：
2.4
通讯作者：
Smeesters, Cecile
中科院分区：
文献类型：
--
作者：
Cyr, Marc-Andre;Smeesters, Cecile
据我们所知，没有人探索过平衡恢复指令的修改对平衡恢复阈值动力学的影响。特别是，限制步数的指令对最大倾斜角时关节扭矩的影响尚未量化。我们确定了 28 名年轻人在最大倾斜角度恢复平衡时踝关节、膝关节和髋关节的扭矩：(i) 仅一步，(ii) 不超过两步，(iii) 步数不限制。结果表明，限制步数的指令不会对峰值归一化关节扭矩产生超过 0.0083 或 ION 的影响，除了第一步腿从第一次到第二次脚跟着地以及第二步腿从第二次脚趾离地到脚后跟着地的膝盖和髋部弯曲扭矩之外。然而，第一步后峰值归一化关节扭矩的这些巨大差异仅仅是由当参与者可以迈不止一步时与参与者仅限于一步时使用的额外步骤引起的。在步数的三个限制之间，直到第一步结束时，双腿的动力学几乎相同，并且额外的步数无助于增加最大倾斜角度。因此，我们已经证明，限制或不限制步数的说明对于研究年轻人的跌倒似乎同样有效。 (c) 2007 Elsevier Ltd. 保留所有权利。
To our knowledge, no one has explored the effect of modifications in balance recovery instructions on the kinetics of the threshold of balance recovery. In particular, the effect of instructions limiting the number of steps on joint torques at the maximum lean angle has not been quantified. We determined the joint torques at the ankle, knee and hip of 28 younger adults recovering balance at their maximum lean angle using: (i) only a single step, (ii) no more than two steps and (iii) no limit on the number of steps. Results showed that instructions limiting the number of steps did not affect peak normalized joint torques by more than 0.0083 or ION in except for knee and hip flexion torques from first to second heel strike for the first step leg as well as from second toe-off to heel strike for the second step leg. However, these large differences in peak normalized joint torques after the first step were simply caused by the additional steps used when participants could take more than one step compared to when participants were limited to only a single step. Between the three limits on the number of steps, the kinetics of both legs were nearly identical up to the end of the first step and the additional steps did not help to increase the maximum lean angle. Therefore, we have demonstrated that instructions limiting or not limiting the number of steps appear to be equally valid to study falls in younger adults. (c) 2007 Elsevier Ltd. All rights reserved.