Motor control mechanism underlying pedalingskills: an analysis of bilateralcoordination in the lower extremities
Motor control mechanism underlying pedalingskills: an analysis of bilateralcoordination in the lower extremities
复制标题
踩踏技巧的运动控制机制：下肢双侧协调性分析
DOI：
10.1007/s10015-019-00580-8
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Tatsushi Tokuyasu
中科院分区：
文献类型：
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作者：
Takuhiro Sato;Riki Kurematsu;Shota Shigetome;Taiki Matsumoto;KazukiTsuruda;Tatsushi Tokuyasu
在竞技自行车领域，由肌肉疲劳引起的非创伤性损伤已被认为是一个重要问题。虽然下肢的肌肉协调是实现高效率蹬踏的关键，但只有少数先前的研究量化了双腿的双边协调。这种量化可能有助于理解增强的踏板技能如何有助于减少肌肉疲劳。本研究的目的是探讨下肢协调的机制，这将有助于进一步扩展对踏板技术的理解。首先，11名健康男性被指示踏板30秒下150瓦的运动负荷和节奏的70，90和110转。接下来，我们调查的协同活动，被称为肌肉协同作用的基础上的时间频率分量的表面肌电，沿着与曲柄旋转角度在踏板运动的左右腿。结果表明，骑自行车时，左右腿肌肉协调的协同作用反映了运动对蹬速的适应性，左右腿的功能作用随着踏频和骑行经验的变化而不同。总之，踏板技能背后的运动控制机制是由与动作相关的双侧肌肉协调来解释的，例如在踏板过程中使用一条腿向下推动踏板，同时使用另一条腿向上拉动另一个踏板。这一结论对单腿蹬踏效率的研究提出了质疑。
In the field of competitive cycling, non-traumatic injuries arising from muscle fatigue have been recognized as a significant problem. Although muscle coordination of the lower extremities is key to achieve high efficiency in pedaling, only a few prior studies have quantified the bilateral coordination of both legs. This quantification could contribute to the understanding of how enhanced pedaling skills may help to reduce muscle fatigue. The aim of this study was to investigate the mechanism underlying inter-lower limb coordination, which should serve to extend the understanding of pedaling skills further. First, 11 healthy males were instructed to pedal for 30 s under a 150-W exercise load and at cadences of 70, 90, and 110 rpm. Next, we investigated the synergistic activity—known as muscle synergy—of both the left and right legs based on the time frequency components of surface electromyography, along with the crank rotation angle during the pedaling exercise. The results indicate that the muscle synergy of bilateral muscle coordination reflects the motor adaptation to pedaling rate during cycling, and the functional roles of the left and right legs differ with changes in cadence and cycling experience. In conclusion, the motor control mechanism underlying pedaling skills is explained by the bilateral muscle coordination related to actions, such as pushing a pedal down using one leg, while pulling the other pedal up using the other leg during pedaling. This conclusion casts doubt on investigations into the efficiency of the pedaling done by a single leg.