Effects of prolonged vibration to vastus intermedius muscle on force steadiness of knee extensor muscles during isometric force-matching task

详细信息    查看全文

• 作者：Akira Saito^a ; ^{a-saito@aoni.waseda.jp}Author Vitae ; Ryosuke Ando^b ; ^cAuthor Vitae ; Hiroshi Akima^b ; ^dAuthor Vitae
• 关键词：Fluctuation ; Surface electromyogram ; Ia afferent ; Quadriceps femoris ; Steady contraction ; Synergistic muscles
• 刊名：Journal of Electromyography and Kinesiology
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：31
• 期：Complete
• 页码：48-54
• 全文大小：846 K
• 卷排序：31

文摘

Afferent inputs from Ia fibers in muscle spindles are essential for the control of force and prolonged vibration has been applied to muscle-tendon units to manipulate the synaptic input from Ia afferents onto α-motor neurons. The vastus intermedius (VI) reportedly provides the highest contribution to the low-level knee extension torque among the individual synergists of quadriceps femoris (QF). The purpose of the present study was to examine the effect of prolonged vibration to the VI on force steadiness of the QF. Nine healthy men (25.1 ± 4.3 years) performed submaximal force-matching task of isometric knee extension for 15 s before and after mechanical vibration to the superficial region of VI for 30 min. Target forces were 2.5%, 10%, and 30% of maximal voluntary contraction (MVC), and force steadiness was determined by the coefficient of variation (CV) of force. After the prolonged VI vibration, the CV of force at 2.5%MVC was significantly increased, but CVs at 10% and 30%MVCs were not significantly changed. The present study concluded that application of prolonged vibration to the VI increased force fluctuations of the QF during a very low-level force-matching task.