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首页> 外文期刊>Journal of Sports Science and Medicine >Assessment of Three-Dimensional Trunk Kinematics and Muscle Activation during Cycling with Independent Cranks
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Assessment of Three-Dimensional Trunk Kinematics and Muscle Activation during Cycling with Independent Cranks

机译：独立曲柄骑行过程中三维躯干运动学和肌肉激活的评估

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Independent cranks (IC) are recently introduced bicycle cranks that are decoupled; therefore allowing each leg to pedal independent of the other. Despite this introduction, limited research has been conducted assessing biomechanical changes when cycling with IC. Therefore, the purpose of this study was to evaluate and compare trunk kinematics and surface electromyography (sEMG) during IC and normal crank (NC) cycling during a graded exercise test to volitional fatigue. Ten healthy, physically active men performed two tests (IC and NC) on a cycling ergometer on separate days. 3D motion capture data of the trunk and pelvis and sEMG of the latissimus dorsi, tibialis anterior, gastrocnemius lateral head, rectus femoris, vastus lateralis and the biceps femoris were collected bilaterally. The first 30 seconds (beginning) and the last 30 seconds (end) of each trial were analyzed with respect to external load (beginning vs end), crank type (IC vs NC) side (left vs right), and phase of the pedal cycle (push vs recovery). Mean load at volitional fatigue in NC (351 W) was significantly greater than IC (318 W; p °) and IC (4.6°). The NC condition demonstrated significantly greater increase in muscle activation from the beginning to the end than the IC condition in the tibialis anterior, rectus femoris and biceps femoris in the push phase, and the rectus femoris and biceps femoris in the recovery phase. As IC demonstrated less increase in activation, they cause less variation in muscular contraction from beginning to end throughout the full pedal range of motion, yet do not alter gross trunk kinematics. Due to altered muscle activation patterns when cycling with IC, they are proposed as a potentially beneficial training tool to increase training diversity.
机译：独立曲柄（IC）是最近推出的自行车曲柄，它们相互分离。因此，允许每条腿的脚踏板彼此独立。尽管有此介绍，但在进行IC循环时，仍进行了有限的研究来评估生物力学变化。因此，本研究的目的是评估和比较IC和正常曲柄（NC）骑行期间针对运动性疲劳进行的分级运动测试中的躯干运动学和表面肌电图（sEMG）。十名健康，身体活跃的男性分别在骑行测功机上进行了两次测试（IC和NC）。双侧收集背阔肌，胫前肌，腓肠肌外侧头，股直肌，股外侧肌和股二头肌的躯干和骨盆的3D运动捕获数据以及sEMG。分析每个试验的前30秒（开始）和后30秒（结束）的外部负载（开始与结束），曲柄类型（IC与NC）侧（左与右）以及踏板的相位周期（推动与恢复）。 NC的疲劳疲劳时的平均负载（351 W）显着大于IC（318 W; p°）和IC（4.6°）。与推翻阶段的胫前肌，股直肌和股二头肌相比，IC状态从开始到结束的肌肉激活增加均明显大于IC状况，而恢复期则表现为股直肌和股二头肌。由于IC表现出的激活增加较少，因此它们在整个踏板运动范围内从头到尾引起的肌肉收缩变化较小，但不会改变总躯干运动学。由于使用IC骑行时改变的肌肉激活模式，它们被建议作为增加训练多样性的潜在有益训练工具。

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