Effects of prolonged patellar tendon vibration on force steadiness in quadriceps femoris during force-matching task
Effects of prolonged patellar tendon vibration on force steadiness in quadriceps femoris during force-matching task
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DOI：
10.1007/s00221-015-4447-x
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发表时间：
2016-01-01
影响因子：
2
通讯作者：
Akima, Hiroshi
中科院分区：
文献类型：
--
作者：
Saito, Akira;Ando, Ryosuke;Akima, Hiroshi
股四头肌（QF）肌群在人体运动中起着至关重要的作用，例如站立、行走和跑步。在人类下肢的身体活动过程中保持稳定的力量的能力对于灵活性、姿势控制和平衡很重要。尽管肌肉肌腱单元的长时间机械振动可以调节从 Ia 传入神经到 α 运动神经元通路的突触输入的功效，但长时间肌腱振动对膝关节伸肌力波动的影响却很少受到关注。本研究的目的是检查长时间髌腱振动对 QF 肌肉力稳定性的影响。 9 名健康男性在髌腱振动或安静坐姿休息（n = 7，控制条件）之前和之后执行了次最大力匹配任务，涉及等长膝关节伸展（n = 7，控制条件）30 分钟。目标力为最大自主收缩 (MVC) 的 2.5%、10% 和 30%。记录四位 QF 增效剂的表面肌电图 (EMG)，并将其标准化为 MVC 期间的 EMG 振幅。 MVC过程中膝关节伸展力和股内侧肌电图振幅在振动后显着降低，但在控制条件下没有显着降低。每个次最大力水平下各个 QF 肌肉的力波动和标准化肌电图在振动后没有显着变化。我们的结论是，在等长力匹配任务中，长时间的髌腱振动不会影响 QF 肌肉的力稳定性。
The quadriceps femoris (QF) muscle group plays an essential role in human movement, such as standing, walking and running. The ability to maintain a steady force during physical activity of the human lower limb is important for mobility, postural control and balance. Although prolonged mechanical vibration of the muscle-tendon unit can moderate the efficacy of synaptic input from Ia afferent onto the alpha-motor neuron pathway, the effect of prolonged tendon vibration on fluctuations of knee extensor force has received little attention. The purpose of the present study was to examine the effects of prolonged patellar tendon vibration on the force steadiness of the QF muscle. Nine healthy men performed a submaximal force-matching task involving isometric knee extension before and after patellar tendon vibration or quiet seated rest (n = 7, control condition) for 30 min. The target force was 2.5, 10 and 30 % of maximal voluntary contraction (MVC). Surface electromyography (EMG) of the four QF synergists was recorded and normalized to EMG amplitude during the MVC. The knee extension force and the EMG amplitude of vastus medialis during the MVC were significantly reduced after the vibration, but did not significantly decrease in the control condition. Fluctuations of force and normalized EMG of individual QF muscles at each submaximal force level did not significantly change after the vibration. We conclude that prolonged patellar tendon vibration does not influence the force steadiness of the QF muscle during an isometric force-matching task.