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首页> 外文期刊>Journal of Biomechanics >Age-related differences in the maintenance of frontal plane dynamic stability while stepping to targets
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Age-related differences in the maintenance of frontal plane dynamic stability while stepping to targets

机译：步向目标时保持额面动态稳定性与年龄有关的差异

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Older adults may be vulnerable to frontal plane dynamic instability, which is of clinical significance. The purpose of the current investigation was to examine the age-related differences in frontal plane dynamic stability by quantifying the margin of stability and hip abductor moment generation of subjects performing a single crossover step and sidestep to targets that created three different step widths during forward locomotion. Nineteen young adults (9 males, age: 22.9 +/- 3.1 years, height: 174.3 +/- 10.2 cm, mass: 71.7 +/- 13.0 kg) and 18 older adults (9 males, age: 72.8 +/- 5.2 years, height: 174.9 +/- 8.6 cm, mass: 78.0 +/- 16.3 kg) participated. For each walking trial, subjects performed a single laterally-directed step to a target on a force plate. Subjects were instructed to "perform the lateral step and keep walking forward". The peak hip abductor moment of the stepping limb was 42% larger by older adults compared to younger adults (p < 0.001). Older adults were also more stable than younger adults at all step targets (p < 0.001). Older adults executed the lateral step with slower forward-directed and lateral-directed velocity despite similar step widths. Age-related differences in hip abduction moments may reflect greater muscular effort by older adults to reduce the likelihood of becoming unstable. The results of this investigation, in which subjects performed progressively larger lateral-directed steps, provide evidence that older adults may not be more laterally unstable than younger adults. However, age-related differences in this study could also reflect a compensatory strategy by older adults to ensure stability while performing this task. (C) 2015 Elsevier Ltd. All rights reserved.
机译：老年人可能容易患额叶动态不稳定，这具有临床意义。当前研究的目的是通过量化对象的稳定性和髋外展力矩的产生来检查与年龄相关的额面动态稳定性的差异，这些对象在向前运动期间对执行了三个不同步长的目标执行了一次跨步和跨步。 19个年轻人（9个男性，年龄：22.9 +/- 3.1岁，身高：174.3 +/- 10.2 cm，体重：71.7 +/- 13.0 kg）和18个老年人（9个男性，年龄：72.8 +/- 5.2岁，身高：174.9 +/- 8.6厘米，体重：78.0 +/- 16.3公斤）。对于每个步行试验，受试者均对压板上的目标执行单个横向定向的步骤。指示受试者“执行横向步伐并继续向前走”。与年轻人相比，老年人的踏肢峰值髋外展力矩大42％（p <0.001）。在所有步长目标下，老年人也比年轻人更稳定（p <0.001）。老年人尽管步幅相似，但仍以较慢的前向和侧向速度执行侧向步。年龄相关的髋关节外展力矩差异可能反映老年人更大的肌肉力量，以减少变得不稳定的可能性。这项研究的结果表明，受试者逐渐执行更大的横向步伐，从而证明，老年人的横向稳定性可能不如年轻人。但是，这项研究中与年龄相关的差异也可能反映了老年人的补偿策略，以确保在执行此任务时保持稳定。 （C）2015 Elsevier Ltd.保留所有权利。

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