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首页> 外文期刊>Gait & posture >Kinematics of the threshold of balance recovery are not affected by instructions limiting the number of steps in younger adults.
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Kinematics of the threshold of balance recovery are not affected by instructions limiting the number of steps in younger adults.

机译：限制年轻人步数的指示不会影响平衡恢复阈值的运动学。

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摘要

To our knowledge, the effect of instructions limiting the number of steps on the threshold of balance recovery has not been quantified, which could make comparisons between studies difficult. We determined the maximum forward lean angles from which 28 younger adults could be suddenly released and still recover balance 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 significantly affected the maximum lean angle but only by a maximum of 1 degree. At the maximum lean angles, they also significantly affected reaction time, first weight transfer time, first stride velocity, first stride length and second stride velocity but only by 8% on average. However, they did not affect muscular latencies, first stride time, first stride height, first stride width or other second step variables. Moreover, at lean angles larger than their maximum, participants were able to respect the instructions but unable to recover balance without safety harness assistance. Given that the effect was too small to be pertinent, we can state that, between the three limits on the number of steps, not only were the maximum lean angles similar but the first steps were nearly identical 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 the threshold of balance recovery in younger adults.
机译：据我们所知，限制步数对平衡恢复阈值的影响尚未得到量化，这可能使研究之间难以进行比较。我们使用以下方法确定了最大的前倾角，可以使28个年轻人突然释放并仍然恢复平衡：（i）仅一步，（ii）不超过两步，并且（iii）步数没有限制。结果表明，限制步数的指令会显着影响最大倾斜角，但最多只能影响1度。在最大倾斜角下，它们也显着影响反应时间，第一重量传递时间，第一步幅速度，第一步幅长度和第二步幅速度，但平均仅影响8％。但是，它们不影响肌肉潜伏期，第一步时间，第一步高度，第一步宽度或其他第二步变量。此外，在大于最大倾斜角的情况下，参与者能够遵守使用说明，但在没有安全带辅助的情况下无法恢复平衡。鉴于影响太小而无法引起关注，我们可以说，在台阶数的三个限制之间，不仅最大倾斜角相似，而且第一步几乎相同，其他台阶无助于增加最大倾斜角。因此，我们已经证明，限制或不限制步骤数的指令对于研究年轻成年人的平衡恢复阈值似乎同样有效。

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