Separating the effects of age and walking speed on gait variability
Separating the effects of age and walking speed on gait variability
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DOI：
10.1016/j.gaitpost.2007.07.009
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发表时间：
2008-05-01
期刊：
影响因子：
2.4
通讯作者：
Dingwell, Jonathan B.
中科院分区：
文献类型：
--
作者：
Kang, Hyun Gu;Dingwell, Jonathan B.
步态变异性与老年人跌倒风险相关。老年人通常比年轻人表现出更大的变异性，但这种增加的原因尚不清楚。在年轻人中，缓慢的行走会导致更大的变化，但在老年人中，缓慢的速度也是典型的。老年人的变异性增加可能是由于步行速度较慢，或者可能是由于与衰老有关的其他因素。我们测试了健康老年人更大的变异性是否可以直接归因于较慢的步行速度。18名健康的老年人（年龄72 +/- 6）和17名性别、身高和体重匹配的年轻人（年龄23 +/- 3）以他们首选速度的80-120%的速度在跑步机上行走。时空步态测量、下肢关节角度和躯干运动的变异性被量化，沿着双侧等长腿部力量和被动关节运动范围。我们的健康老年人和年轻受试者之间的首选步行速度没有差异。在两组中，步幅时间、前侧髋关节和膝关节运动、膝关节内旋/外旋和所有躯干运动的变异性均为速度依赖性（p < 0.002）。老年人表现出更大的变异性（p = 0.0003）躯干滚动，速度的变化无关。步长（p = 0.005）、步幅时间（p = 0.018）和躯干俯仰（p = 0.022）表现出相似的趋势。这种更大的变异性可以通过莱亚强度降低和被动活动范围来解释。因此，观察到的老年人步态的较大变化可能更多地是由于力量和灵活性的丧失，而不是由于他们较慢的速度。(c)2007 Elsevier B. V.保留所有权利。
Gait variability has been correlated with fall risk in the elderly. Older adults typically display greater variability than young adults, but the cause of this increase is unclear. Slower walking leads to greater variability in young adults, but slow speeds are also typical in older adults. Increased variability in older adults may result from slower walking speeds, or possibly from other factors related to aging. We tested whether greater variability in healthy older adults could be attributed directly to slower walking speed. Eighteen healthy older adults (age 72 +/- 6) and 17 gender-, height- and weight-matched young adults (age 23 +/- 3) walked on a treadmill at speeds of 80-120% of their preferred speed. Variability of spatio-temporal gait measures, lower extremity joint angles, and trunk motions were quantified, along with bilateral isometric leg strengths and passive joint ranges of motion. Preferred walking speeds were not different between our healthy elderly and young subjects. In both groups, variability was speed-dependent for stride time, frontal hip and knee motions, knee internal/external rotations, and all trunk motions (p < 0.002). Older adults exhibited greater variability (p = 0.0003) for trunk roll, independent of changes in speed. Step length (p = 0.005), stride time (p = 0.018), and trunk pitch (p = 0.022) exhibited similar trends. This greater variability was explained by decreased lea strength and passive ranges of motion. Thus, the greater variability observed in the gait of older adults may result more from loss of strength and flexibility than from their slower speeds. (c) 2007 Elsevier B.V. All rights reserved.