Interaction between age and gait velocity in the amplitude and timing of antagonist muscle coactivation
Interaction between age and gait velocity in the amplitude and timing of antagonist muscle coactivation
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DOI：
10.1016/j.gaitpost.2008.12.007
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发表时间：
2009-06-01
期刊：
影响因子：
2.4
通讯作者：
DeVita, Paul
中科院分区：
文献类型：
--
作者：
Hortobagyi, Tibor;Solnik, Stanislaw;DeVita, Paul
老年人执行单关节自愿运动增强拮抗肌共激活和激动剂和拮抗肌之间的时间改变。目前尚不清楚老年人在最常见的日常生活活动形式步态中是否采取类似的策略，以及年龄和步态速度是否相互作用。我们比较了17名年轻人（年龄19 - 25岁）和17名老年人（年龄71 - 85岁）在1.2，1.5和1.8 m/s步行时的拮抗肌激活幅度和起始，偏移和激活持续时间的股外侧肌，股二头肌，胫骨前肌和腓肠肌外侧肌的表面肌电图。所有的参与者都是健康的和高度移动的。当每一块肌肉都作为拮抗剂时，老年人的四块肌肉的激活水平平均比年轻人高83%（每块肌肉p <0.05）。在两个四块肌肉的激活增加步态速度在年轻人，但不是在老年人。年轻人与老年人相比，TA和GL之间的爆发间期长两倍（83 ms），在较高的步态速度下，年轻人缩短14%（24 ms），但老年人延长51%（31 ms）（相互作用，p = 0.015）。结论：年龄和步态速度在拮抗肌共激活的幅度和时间上存在交互作用。由爱思唯尔公司出版
Old adults execute single-joint voluntary movements with heightened antagonist muscle coactivation and altered timing between agonist and antagonist muscles. It is less clear if old adults adopt similar strategies during the most common form of activity of daily living, gait, and if age and gait velocity interact. We compared antagonist muscle activation amplitude and onset, offset, and activation duration of the vastus lateralis, biceps femoris, tibialis anterior, and gastrocnemius lateralis from surface EMG in 17 young (age 19-25) and 17 old adults (age 71-85) while walking at 1.2, 1.5, and 1.8 m/s. All participants were healthy and highly mobile. The activation level of the four muscles when each acted as the antagonist was, on the average, 83% higher in old vs young adults (for each muscle p < 0.05). In two of four muscles this activation increased with gait velocity in young but not in old adults. The inter-burst interval between TA and GL was two-fold (83 ms) longer in young vs old adults and at higher gait velocities it became 14% (24 ms) shorter in young but 51% (31 ms) longer in old adults (interaction, p = 0.015). It is concluded that there is an interaction between age and gait velocity in the amplitude and timing of antagonist muscle coactivation. Published by Elsevier B.V.