Center of pressure control for balance maintenance during lateral waist-pull perturbations in older adults.
Center of pressure control for balance maintenance during lateral waist-pull perturbations in older adults.
复制标题
在老年人侧腰部扰动期间，压力控制中心的平衡维护中心。
DOI：
10.1016/j.jbiomech.2015.02.012
复制
发表时间：
2015-04-13
影响因子：
2.4
通讯作者：
Rogers, Mark W.
中科院分区：
文献类型：
--
作者：
Fujimoto, Masahiro;Bair, Woei-Nan;Rogers, Mark W.
当平衡受到干扰时，压力中心（COP）的位置有助于人从扰动中恢复的能力。本研究调查COP控制之前，第一步升空（FSLO）在横向扰动在老年人的非瀑布和瀑布。38名非跌倒者和16名跌倒者接受了5种不同强度的侧向拉腰。分析了强度水平下的交叉步进反应，其中最大数量的受试者响应交叉步进。计算相对于支撑基底（BOS）的中-外侧（ML）方向上的全身质心（COM）和COP位置以及COP速度。倒立摆模型被用来定义在FSLO的BOS稳定性边界，这也是使用在FSLO的COP位置（功能边界）进行调整。跌倒者和非跌倒者的COP速度无显著差异（p> 0.093）。然而，Fallers的COP位置在FSLO处明显更靠内侧（p≤.01），导致功能边界明显缩小。尽管Fallers的稳定性裕度（基于BOS的稳定性测量）显著大于零（p≤.004），但功能边界的稳定性裕度与零无显著差异，即，达到功能稳定极限。坠落者在ML方向上降低了稳定性的功能极限，这将使他们比非坠落者更容易处于不稳定的稳定性条件下。正如我们所观察到的，这可能是比非下跌者采取更多步骤恢复平衡的原因。功能边界估计可能是比BOS边界更敏感的平衡不稳定性标记。
When balance is disturbed, location of the center of pressure (COP) contributes to a person’s ability to recover from a perturbation. This study investigated COP control prior to first step lift-off (FSLO) during lateral perturbations in older non-fallers and fallers. 38 Non-Fallers and 16 Fallers received lateral waist-pulls at 5 different intensities. Crossover stepping responses at the intensity level where the largest number of subjects responded with crossover steps were analyzed. Whole-body center of mass (COM) and COP positions in the medio-lateral (ML) direction with respect to the base of support (BOS), and COP velocity were calculated. An inverted pendulum model was used to define the BOS stability boundary at FSLO, which was also adjusted using the COP position at FSLO (functional boundary). No significant differences were found in the COP velocities between Fallers and Non-Fallers (p>.093). However, the COP positions for Fallers were located significantly more medial at FSLO (p≤.01), resulting in a significantly reduced functional boundary. Although the stability margins, measures of stability based on the BOS, were significantly larger than zero for Fallers (p≤.004), they were not significantly different from zero for the functional boundary, i.e., reaching the functional stability limit. Fallers had reduced functional limits of stability in the ML direction, which would predispose them to more precarious stability conditions than Non-Fallers. This could be a cause for taking more steps than Non-Fallers for balance recovery as we observed. The functional boundary estimation may be a more sensitive marker of balance instability than the BOS boundary.
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DOI：
10.1093/gerona/51a.6.m289
发表时间：
1996-11-01
影响因子：
5.1
作者：
McIlroy, WE;Maki, BE
通讯作者：
Maki, BE
DOI：
10.1093/geronj/49.6.m258
发表时间：
1994-11-01
期刊：
JOURNALS OF GERONTOLOGY
影响因子：
--
作者：
KING, MB;JUDGE, JO;WOLFSON, L
通讯作者：
WOLFSON, L
影响因子：
6.7
作者：
Maki, Brian E.;McIlroy, William E.
通讯作者：
McIlroy, William E.
DOI：
10.1111/j.1532-5415.1994.tb06218.x
发表时间：
1994-10-01
影响因子：
6.3
作者：
LORD, SR;WARD, JA;ANSTEY, KJ
通讯作者：
ANSTEY, KJ
影响因子：
120.7
作者：
NEVITT, MC;CUMMINGS, SR;BLACK, D
通讯作者：
BLACK, D