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首页> 外文期刊>Journal of Biomechanics >Transference of 3D accelerations during cross country mountain biking
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Transference of 3D accelerations during cross country mountain biking

机译：3D加速度在跨国山地自行车期间的转移

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Investigations into the work demands of Olympic format cross country mountain biking suggest an incongruent relationship between work done and physiological strain experienced by participants. A likely but unsubstantiated cause is the extra work demand of muscle damping of terrain/surface induced vibrations. The purpose of this study was to describe the relationship between vibration mechanics and their interaction with terrain, bicycle and rider during a race pace effort on a cross country mountain bike track, on both 26″ and 29″ wheels. Participants completed one lap of a cross country track using 26″ and 29″ wheels, at race pace. Power, cadence, speed, heart rate and geographical position were sampled and logged every second for control purposes. Tri-axial accelerometers located on the bicycle and rider, recorded accelerations (128. Hz) and were used to quantify vibrations experienced during the whole lap and over terrain sections (uphill and downhill). While there were no differences in power output (p=0.3062) and heart rate (p=0.8423), time to complete the lap was significantly (p=0.0061) faster on the 29″ wheels despite increased vibrations in the larger wheels (p=0.0020). Overall accelerometer data (RMS) showed location differences (p<0.0001), specifically between the point of interface of bike-body compared to those experienced at the lower back and head. The reduction in accelerations at both the lower back and head are imperative for injury prevention and demonstrates an additional non-propulsive, muscular, challenge to riding. Stress was greatest during downhill sections as acceleration differences between locations were greater when compared to uphill sections, and thus possibly prevent the recovery processes that may occur during non-propulsive load.
机译：调查奥林匹克格式越野山地骑行的工作需求表明，参与者经历的工作和生理压力之间的不一致关系。一个可能但未经证实的原因是地形/表面诱导振动的肌肉阻尼的额外工作需求。本研究的目的是描述振动力学与地形，自行车和骑车者之间的关系，在越野山地自行车轨道上的比赛努力中，在26“和29”车轮上。参与者在比赛步伐中完成了26“和29”车轮的一圈越野轨道。采样电源，节奏，速度，心率和地理位置，并记录每秒以进行控制目的。位于自行车和骑车者上的三轴加速度计，记录的加速度（128.Hz），用于量化整个膝盖和地形部分（上坡和下坡）的振动。虽然电源输出没有差异（p = 0.3062）和心率（p = 0.8423），但在29“车轮上完成速度的时间明显（p = 0.0061），尽管较大的轮子中增加振动（p = 0.0020）。总体加速度计数据（RMS）显示出位置差异（P <0.0001），具体地与自行车体的界面之间，与下背部和头部的经历相比。下背部和头部的加速度的减少是预防损伤的迫在因素，并展示骑行的额外不推进的肌肉肌肉挑战。在与上坡部分相比时，在下坡部分期间，压力最大，因为与上坡部分相比，位置之间的加速差异，因此可能防止在非推动负载期间可能发生的恢复过程。

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