Differences in lower-extremity muscular activation during walking between healthy older and young adults.
Differences in lower-extremity muscular activation during walking between healthy older and young adults.
复制标题
在健康的老年人和年轻人之间行走过程中，低超级性肌肉激活的差异。
DOI：
10.1016/j.jelekin.2008.10.008
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发表时间：
2009-12
影响因子：
2.5
通讯作者：
Thelen, Darryl G.
中科院分区：
文献类型：
--
作者：
Schmitz, Anne;Silder, Amy;Heiderscheit, Bryan;Mahoney, Jane;Thelen, Darryl G.
以前的研究已经确定了健康的老年人和年轻人之间步态动力学的差异。然而，导致这些变化的潜在因素并没有得到很好的理解。这项研究的目的是评估年龄和速度对人类行走过程中腿部肌肉激活的影响。我们记录了健康的年轻人和老年人以慢、首选和快的步行速度走过地面时比目鱼肌、腓肠肌、股二头肌、内侧腿筋、胫前肌、股外侧肌和股直肌的肌电(EMG)信号。健康老年人19例，年龄73±5岁，健康青年18例，年龄26±3岁。矫正后的肌电信号被归一化，以表示在一个步态周期中以首选速度进行的活动，从而可以评估活动在步态周期中的分布以及随速度调节的情况。与年轻人相比，老年人在所有步行速度下的中立位时，胫骨前肌和比目鱼肌表现出更大的激活，在负重和中立位时，股外侧肌和内侧腿筋表现出更大的激活，这表明脚踝和膝盖的协同激活增加。此外，老年人较少依赖比目鱼肌的激活来推动更快的步行速度。我们的结论是，与年龄相关的神经肌肉活动的变化反映了一种在单次支撑时使肢体僵硬的策略，并可能有助于在快速行走时减少推力。
Previous studies have identified differences in gait kinetics between healthy older and young adults. However, the underlying factors that cause these changes are not well understood. The objective of this study was to assess the effects of age and speed on the activation of lower-extremity muscles during human walking. We recorded electromyography (EMG) signals of the soleus, gastrocnemius, biceps femoris, medial hamstrings, tibialis anterior, vastus lateralis, and rectus femoris as healthy young and older adults walked over ground at slow, preferred and fast walking speeds. Nineteen healthy older adults (age, 73 ± 5 years) and 18 healthy young adults (age, 26 ± 3 years) participated. Rectified EMG signals were normalized to mean activities over a gait cycle at the preferred speed, allowing for an assessment of how the activity was distributed over the gait cycle and modulated with speed. Compared to the young adults, the older adults exhibited greater activation of the tibialis anterior and soleus during mid-stance at all walking speeds and greater activation of the vastus lateralis and medial hamstrings during loading and mid-stance at the fast walking speed, suggesting increased coactivation across the ankle and knee. In addition, older adults depend less on soleus muscle activation to push off at faster walking speeds. We conclude that age-related changes in neuromuscular activity reflect a strategy of stiffening the limb during single support and likely contribute to reduced push off power at fast walking speeds.
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影响因子：
2.4
作者：
Silder, Amy;Heiderscheit, Bryan;Thelen, Darryl G.
通讯作者：
Thelen, Darryl G.
影响因子：
6.3
作者：
Mian, OS;Thom, JM;Minetti, AE
通讯作者：
Minetti, AE
影响因子：
3.3
作者：
FRONTERA, WR;HUGHES, VA;EVANS, WJ
通讯作者：
EVANS, WJ
影响因子：
1.8
作者：
CAPPOZZO, A;CATANI, F;LEARDINI, A
通讯作者：
LEARDINI, A
影响因子：
2.4
作者：
Stewart, Caroline;Postans, Neil;Roberts, Andrew
通讯作者：
Roberts, Andrew