Functional role of trunk muscles during coordinated upper and lower limb movements

本研究的目的是揭示躯干肌肉在人类有节奏的手臂和/或腿部蹬踏过程中的功能和生理作用。结果发现，随着负荷和步频的增加，左、右竖脊肌（ES）和腹肌（AB）的肌电活动呈非线性增加。此外，对于同侧和对侧的ES和AB肌肉，与坐姿期间获得的那些相比，功率阶段期间的皮肤反射的幅度被强烈地促进。最后，我们研究了学习过程如何调节腿与手臂的相互作用，其特征是在手臂踩踏板时，腿踩踏板叠加在手臂踩踏板时，手臂节奏的特定下降。我们发现，在重复训练的1至4周内，这种相互作用逐渐减少。

This research project was conducted with the aim of revealing the functional and physiological roles of trunk muscles during rhythmic arm and/or leg pedaling in humans. It was found that EMG activity of left and right erector spinae (ES) and abdominal muscles (AB) increased non-linearly with an increase in load and cadence. In addition, with regard to ES and AB muscles of the ipsilateral and contralateral sides, the magnitude of the cutaneous reflexes was strongly facilitated during the power phase compared to those obtained during a sitting position. Finally, we examined how the learning process modulates leg-to-arm interaction; this was characterized by a specific decrease in arm cadence when the leg pedaling was superimposed during arm pedaling. We found that the interaction gradually decreased within 1 to 4 weeks of repetitive training.