Speed related changes in muscle activity from normal to very slow walking speeds
Speed related changes in muscle activity from normal to very slow walking speeds
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DOI：
10.1016/s0966-6362(03)00071-7
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发表时间：
2004-06-01
期刊：
影响因子：
2.4
通讯作者：
Duysens, J
中科院分区：
文献类型：
--
作者：
den Otter, AR;Geurts, ACH;Duysens, J
在非常慢的步行速度下的神经肌肉活动的研究可能会导致更好地理解步行过程中的速度调节机制，并可能有助于解释步行缓慢的患者的步态数据。步行速度的极度降低将导致运动任务需求的变化，这可能最终导致作为步行基础的肌肉活动模式的改变。本研究的目的是调查在非常缓慢的步行（< 0.28 m s（-1））的下肢肌肉活动的模式，并研究神经肌肉增益函数，反映步行速度对肌电图（EMG）振幅的相位依赖性影响。九名健康年轻人以七种不同的步行速度（1.39、0.83、0.28、0.22、0.17、0.11和0.06 m s（-1））行走，同时记录八块下肢肌肉的EMG。结果表明，肌肉活动的相位保持相对稳定的步行速度，尽管其幅度的实质性变化。然而，在1.39和0.28 m s（-1）之间，股直肌、股二头肌和胫骨前肌活动的时期被发现是特定速度范围的典型特征。当步行速度进一步降低到几乎站立时，静止（0.06 m s（-1）），在站立中期的腓骨长肌和摆动后期的股直肌中发现了负增益值，表明随着步行速度的降低出现了新的活动爆发。据建议，这些额外的活动可能是由于增加。对姿势稳定性的要求，以及在非常慢的速度下摆动肢体的动态变化。(C)2003 Elsevier B. V.保留所有权利。
The study of neuromuscular activity at very slow walking speeds may lead to a better understanding of the mechanisms underlying speed regulation during walking, and may aid the interpretation of gait data in patients who walk slowly. Extreme reductions in walking speed will cause changes in locomotor task demands that may eventually result in modifications of the patterning of muscle activity that underlies walking. The aim of the present study was to investigate patterns of lower limb muscle activity during very slow walking (< 0.28 m s(-1)), and to study the neuromuscular gain functions that reflect the phase dependent effects of walking speed on electromyographic (EMG) amplitude. Nine healthy young adults walked at seven different walking speeds (1.39, 0.83, 0.28, 0.22, 0.17, 0.11, and 0.06 m s(-1)) while EMG was recorded from eight lower extremity muscles. Results showed that the phasing of muscle activity remained relatively stable over walking, speeds despite substantial changes in its amplitude. However, between 1.39 and 0.28 m s(-1), epochs of Rectus femoris, Biceps femoris and Tibialis anterior activities were found that were typical for specific speed ranges. When walking speed decreased further to almost standing, still (0.06 m s(-1)), negative gain values were found in Peroneus longus during midstance and Rectus femoris in late swing, indicating the emergence of new bursts of activity with decreasing walking speed. It is proposed that these extra activities may be attributed to increased. demands on postural stability, and the altered dynamics of the swinging limb at very slow speeds. (C) 2003 Elsevier B.V. All rights reserved.