Age-Associated Differences in Positional Variability Are Greater With the Lower Limb
Age-Associated Differences in Positional Variability Are Greater With the Lower Limb
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DOI：
10.1080/00222895.2011.598893
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发表时间：
2011-01-01
影响因子：
1.4
通讯作者：
Christou, Evangelos A.
中科院分区：
文献类型：
--
作者：
Kwon, MinHyuk;Baweja, Harsimran S.;Christou, Evangelos A.
作者的目的是确定年龄和肢体在不同负荷下对位置变异性的相互作用。11名年轻人和10名老年人被要求准确匹配并保持水平目标线，食指外展5度，脚踝背屈5度，持续20秒，载荷范围为可举起的最大载荷的2%至50%。每个肢体。视觉增益保持恒定在1度（视角）。位置变异性较大，在老年人的两个肢体，但年龄相关的差异较大的踝关节背屈任务相比，食指任务的外展。此外，我们发现，独立于年龄，运动输出变异性与下肢更大。这些结果提供了新的证据，老年人可能表现出更大的障碍，在运动控制与脚相比，手指。此外，这些研究结果支持的想法，使用不同的任务比以前的文献，下肢有更大的运动输出的变化比上肢。
The authors' purpose was to determine the interaction of age and limb used on positional variability at different loads. Eleven young adults and 10 older adults were asked to accurately match and maintain a horizontal target line with 5 degrees abduction of their index finger and 5 degrees dorsiflexion of their ankle for 20 s at loads ranging from 2 to 50% of the maximal load that could be lifted with each limb. The visual gain was kept constant at 1 degrees (visual angle). Positional variability was greater in older adults for both limbs, nonetheless age-associated differences were greater for the ankle dorsiflexion task compared with the abduction of the index finger task. In addition, we found that, independent of age, motor output variability was greater with the lower limb. These results provide novel evidence that older adults may exhibit greater impairments in motor control with the foot compared with the finger. Furthermore, these findings support the idea, using a different task than previous literature, that the lower limb has greater motor output variability than the upper limb.