Single and multiple step balance recovery responses can be different at first step lift-off following lateral waist-pull perturbations in older adults.
Single and multiple step balance recovery responses can be different at first step lift-off following lateral waist-pull perturbations in older adults.
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DOI：
10.1016/j.jbiomech.2017.02.014
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发表时间：
2017-04-11
影响因子：
2.4
通讯作者：
Rogers MW
中科院分区：
文献类型：
--
作者：
Fujimoto M;Bair WN;Rogers MW
不能用一步来恢复横向平衡是老年人未来福尔斯的预测。本研究调查了在第一步离地（FSLO）时，多步和单步响应对横向扰动的平衡稳定性是否不同。54名健康老年人接受了5种不同强度（1-5级）的左腰和右腰牵拉。分析了在强度水平3及以上引起单步和多步的交叉步进响应。计算相对于支撑基座的中-外侧方向上的全身质心（COM）和压力中心（COP）位置。利用倒立摆模型确定了横向稳定边界，并利用FSLO（功能边界）处的COP位置对横向稳定边界进行了调整。在FSLO（p ≥ 0.075）时，未检测到应答之间的COP位置存在显著差异，表明应答之间的功能边界无差异。在所有水平的多个步骤中，在第一步着陆时观察到稳定性界值显著较小（p ≤ 0.024），而在水平3和4的FSLO时稳定性界值也显著较小（p ≤0.048）。这些研究结果表明，虽然在第一次脚接触的稳定性降低将与采取额外的步骤，步进响应也可以归因于COM运动状态，早在第一步抬离，脚接触之前。旨在改善稳定性反应控制的基于扰动的训练干预措施将减少第一步离地时的初始平衡不稳定性，并可能减少随后响应平衡扰动而需要多个步骤的情况。
An inability to recover lateral balance with a single step is predictive of future falls in older adults. This study investigated if balance stability at first step lift-off (FSLO) would be different between multiple and single stepping responses to lateral perturbations. 54 healthy older adults received left and right waist-pulls at 5 different intensities (levels 1–5). Crossover stepping responses at and above intensity level 3 that induced both single and multiple steps were analyzed. Whole-body center of mass (COM) and center of pressure (COP) positions in the medio-lateral direction with respect to the base of support were calculated. An inverted pendulum model was used to define the lateral stability boundary, which was also adjusted using the COP position at FSLO (functional boundary). No significant differences were detected in the COP positions between the responses at FSLO (p ≥ 0.075), indicating no difference in the functional boundaries between the responses. Significantly smaller stability margins were observed at first step landing for multiple steps at all levels (p ≤ 0.024), while stability margins were also significantly smaller at FSLO for level 3 and 4 (p ≤0.048). These findings indicate that although reduced stability at first foot contact would be associated with taking additional steps, stepping responses could also be attributable to the COM motion state as early as first step lift-off, preceding foot contact. Perturbation-based training interventions aimed at improving the reactive control of stability would reduce initial balance instability at first step lift-off and possibly the consequent need for multiple steps in response to balance perturbations.
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DOI：
10.1016/j.clinbiomech.2016.04.015
发表时间：
2016-07
期刊：
Clinical biomechanics (Bristol, Avon)
影响因子：
--
作者：
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通讯作者：
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影响因子：
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发表时间：
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影响因子：
5.1
作者：
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DOI：
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发表时间：
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期刊：
JOURNALS OF GERONTOLOGY
影响因子：
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作者：
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通讯作者：
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影响因子：
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