Federal University of Pampa, Applied Neuromechanics Group, Uruguaiana, RS, Brazil.
J Electromyogr Kinesiol. 2010 Dec;20(6):1230-6. doi: 10.1016/j.jelekin.2010.07.013. Epub 2010 Aug 21.
The aim of this study was to investigate the effect of leg preference and cycling experience on unilateral muscle efficiency and muscle activation. To achieve this purpose, two experiments were performed. Experiment 1 involved eight cyclists and experiment 2 included eight non-cyclists. Subjects underwent an incremental maximal test and submaximal trials of one-legged cycling for preferred and non-preferred leg. Oxygen uptake and muscle efficiency were compared between legs. The magnitude of muscle activation (RMS) and the inter-limb excitation were monitored for the vastus lateralis, biceps femoris and gastrocnemius (medial head) muscles during one-legged cycling with preferred and non-preferred leg. Variables of muscle activation, oxygen uptake and muscle efficiency (gross and net) did not differ between legs (P>0.05). The magnitude of muscle activation and its variability were similar between legs while performing the unilateral pedaling. Inter-limb communication did not differ between experiments (P>0.05). Similar activation between legs was consistent with the influence of bilateral practice for attaining similar performance between sides. These results do not support asymmetry in magnitude of muscle activation during pedaling.
本研究旨在探讨腿部偏好和骑行经验对单侧肌肉效率和肌肉激活的影响。为此进行了两项实验。实验 1 包括 8 名自行车运动员，实验 2 包括 8 名非自行车运动员。受试者进行了递增最大测试和单腿骑行的亚最大试验，分别针对惯用腿和非惯用腿。比较了双腿之间的耗氧量和肌肉效率。在单腿骑行中，监测了股外侧肌、股二头肌和腓肠肌（内侧头）的肌肉激活幅度（RMS）和肢体间兴奋度，分别针对惯用腿和非惯用腿。肌肉激活、耗氧量和肌肉效率（总功和净功）的变量在双腿之间没有差异（P>0.05）。在进行单侧蹬踏时，肌肉激活的幅度和变异性在双腿之间相似。实验之间的肢体间交流没有差异（P>0.05）。双腿之间的相似激活与双侧练习对实现两侧相似表现的影响一致。这些结果不支持蹬踏过程中肌肉激活幅度的不对称性。
