The effect of pedaling rate on coordination in cycling
The effect of pedaling rate on coordination in cycling
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DOI：
10.1016/s0021-9290(97)00071-7
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发表时间：
1997-10-01
影响因子：
2.4
通讯作者：
Hull, ML
中科院分区：
文献类型：
--
作者：
Neptune, RR;Kautz, SA;Hull, ML
为了进一步了解骑自行车时下肢神经肌肉的协调性，本研究的目的是检查蹬踏率对协调策略的影响，并解释任何明显的变化。这些目标是通过收集肌电图（EMG）数据的8个下肢肌肉和曲柄角数据从10个主题在250 W跨踏板率范围从45到120 RPM。为了研究踩踏率对协调性的影响，计算了EMG爆发和偏移以及积分EMG（iEMG）。此外，进行相位控制功能组（PCFG）分析，以解释在肌肉功能的背景下观察到的EMG模式的变化。结果表明，随着蹬踏率的增加，肌电的起始和终止时间系统地提前，但比目鱼肌在曲柄循环中的起始和终止时间较晚。iEMG结果显示，肌肉对增加踏板速度的反应不同。腓肠肌、腘绳肌和股内侧肌系统地增加了肌肉活动，随着蹬踏率的增加。臀大肌和比目鱼肌有显著的二次趋势，在90 RPM时最小值，而胫骨前肌和股直肌与蹬踏率无显著相关性。PCFG分析表明，在所有蹬踏率下，下肢肌肉的主要功能保持不变。PCFG分析，这占肌肉激活动力学，揭示了肌肉兴奋的早期发作产生的肌肉活动在曲柄循环的同一区域。此外，虽然大多数肌肉兴奋的一个单一的功能阶段，比目鱼肌和股直肌兴奋在两个功能阶段。比目鱼肌被归类为伸肌-底部过渡肌，而股直肌被归类为伸肌-顶部过渡肌。此外，每种功能的相对重点似乎随着踏板速度的增加而转移，尽管每块肌肉仍然是双功能的。(C)1997年爱思唯尔科学有限公司
To further understand lower extremity neuromuscular coordination in cycling, the objectives of this study were to examine the effect of pedaling rate on coordination strategies and interpret any apparent changes. These objectives were achieved by collecting electromyography (EMG) data of eight lower extremity muscles and crank angle data from ten subjects at 250 W across pedaling rates ranging from 45 to 120 RPM. To examine the effect of pedaling rate on coordination, EMG burst onset and offset and integrated EMG (iEMG) were computed. In addition, a phase-controlled functional group (PCFG) analysis was performed to interpret observed changes in the EMG patterns in the context of muscle function. Results showed that the EMG onset and offset systematically advanced as pedaling rate increased except for the soleus which shifted later in the crank cycle. The iEMG results revealed that muscles responded differently to increased pedaling rate. The gastrocnemius, hamstring muscles and vastus medialis systematically increased muscle activity as pedaling rate increased. The gluteus maximus and soleus had significant quadratic trends with minimum values at 90 RPM, while the tibialis anterior and rectus femoris showed no significant association with pedaling rate. The PCFG analysis showed that the primary function of each lower extremity muscle remained the same at all pedaling rates. The PCFG analysis, which accounts for muscle activation dynamics, revealed that the earlier onset of muscle excitation produced muscle activity in the same region of the crank cycle. Also, while most of the muscles were excited for a single functional phase, the soleus and rectus femoris were excited during two functional phases. The soleus was classified as an extensor-bottom transition muscle, while the rectus femoris was classified as a top transition-extensor muscle. Further, the relative emphasis of each Function appeared to shift as pedaling rate was increased, although each muscle remained bifunctional. (C) 1997 Elsevier Science Ltd.