等长收缩期间股四头肌浅层和深层肌束行为的差异。
Difference in fascicle behaviors between superficial and deep quadriceps muscles during isometric contractions.
作者信息
Ando Ryosuke, Nosaka Kazunori, Inami Takayuki, Tomita Aya, Watanabe Kohei, Blazevich Anthony J, Akima Hiroshi
机构信息
Graduate School of Education and Human Development, Nagoya University, Furo, Chikusa, Nagoya, Aichi, 464-8601, Japan.
Centre for Exercise and Sport Science Research, School of Exercise and Health Sciences, Edith Cowan University, Perth, Western Australia, Australia.
出版信息
Muscle Nerve. 2016 May;53(5):797-802. doi: 10.1002/mus.24905. Epub 2016 Mar 1.
INTRODUCTION
In this study we examined changes in fascicle length and pennation of vastus intermedius (VI) and vastus lateralis (VL) from rest to isometric contraction.
METHODS
Fourteen healthy men performed submaximal (30% and 50% of maximal voluntary contraction; MVC) isometric knee extensions at 60° and 110° knee flexion (0° = full extension). Panoramic images of VL and VI were obtained at rest and during contractions to measure fascicle length and pennation using extended field-of-view ultrasonography, after confirmation that the technique could be used reliably during sustained submaximal isometric contractions.
RESULTS
The relative change in fascicle length from rest to 50% MVC was greater in VI than VL at 110° (P < 0.05). Pennation increased during contraction at 60° for VL (P < 0.05), but not for VI.
CONCLUSION
Muscle-dependent fascicle behaviors were observed during contraction. These findings may provide a mechanistic underpinning for differences in sarcomere length changes, relative force contribution, and blood flow during contraction.
引言
在本研究中，我们检测了股中间肌（VI）和股外侧肌（VL）从静息状态到等长收缩过程中肌束长度和羽状角的变化。
方法
14名健康男性在膝关节屈曲60°和110°（0°=完全伸展）时进行次最大强度（最大自主收缩的30%和50%；MVC）等长伸膝动作。在确认该技术可在持续次最大强度等长收缩过程中可靠使用后，于静息状态和收缩过程中获取VL和VI的全景图像，以使用扩展视野超声测量肌束长度和羽状角。
结果
在110°时，从静息状态到50%MVC，VI的肌束长度相对变化大于VL（P<0.05）。VL在60°收缩时羽状角增加（P<0.05），而VI则无变化。
结论
收缩过程中观察到了依赖于肌肉的肌束行为。这些发现可能为收缩过程中肌节长度变化、相对力贡献和血流差异提供机制基础。
Zotero 插件