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首页> 外文期刊>Journal of Biomechanics >Influence of pedaling rate on bilateral asymmetry in cycling
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Influence of pedaling rate on bilateral asymmetry in cycling

机译：踩踏速率对骑行中双侧不对称的影响

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The objectives of this study were to (1) determine whether bilateral asymmetry in cycling changed systematically with pedaling rate, (2) determine whether the dominant leg as identified by kicking contributed more to average power over a crank cycle than the other leg, and (3) determine whether the dominant leg asymmetry changed systematically with pedaling rate. To achieve these objectives, data were collected from 11 subjects who pedaled at five different pedaling rates ranging from 60 to 120 rpm at a constant workrate of 260 W. Bilateral pedal dynamometers measured two orthogonal force components in the plane of the bicycle. From these measurements, asymmetry was quantified by three dependent variables, the percent differences in average positive power (%AP), average negative power (%AN), and average crank power (%AC). Differences were taken for two cases - with respect to the leg generating the greater total average for each power quantity at 60 rpm disregarding the measure of dominance, and with respect to the dominant leg as determined by kicking. Simple linear regression analyses were performed on these quantities both for the subject sample and for individual subjects. For the subject sample, only the percent difference in average negative power exhibited a significant linear relationship with pedaling rate; as pedaling rate increased, the asymmetry decreased. Although the kicking dominant leg contributed significantly greater average crank power than the non-dominant leg for the subject sample, the non-dominant leg contributed significantly greater average positive power and average negative power than the dominant leg. However, no significant linear relationships for any of these three quantities with pedaling rate were evident for the subject sample because of high variability in asymmetry among the subjects. For example, significant linear relationships existed between pedaling rates and percent difference in total average power per leg for only four of the 11 subjects and the nature of these relationships was different (e.g. positive versus negative slopes). It was concluded that pedaling asymmetry is highly variable among subjects and that individual subjects may exhibit different systematic changes in asymmetry with pedaling rate depending on the quantity of interest.
机译：这项研究的目的是（1）确定自行车的双侧不对称性是否随踩踏率而系统地改变;（2）确定通过踢法确定的优势腿在曲柄循环中的平均力量是否比另一腿有更大的贡献，并且（ 3）确定主要的腿部不对称性是否随着蹬踏率而系统地改变。为了实现这些目标，收集了来自11位受试者的数据，这些受试者以260 W的恒定工作速率以60至120 rpm的五种不同的踩踏速度踩踏。双侧脚踏测力计测量了自行车平面中的两个正交力分量。通过这些测量，可以通过三个因变量（平均正功率（％AP），平均负功率（％AN）和平均曲柄功率（％AC）的百分比差异）对不对称性进行量化。在两种情况下存在差异-相对于腿部，在不考虑优势度的情况下，在60 rpm时每个功率量产生的总平均数更大，而相对于通过踢腿确定的优势腿部。对受试者样本和单个受试者的这些数量进行简单的线性回归分析。对于受试者样本，只有平均负功率的百分比差异与踩踏率之间显示出显着的线性关系。随着踩踏速度的增加，不对称性降低。尽管对于受试者样本，踢腿的支腿贡献的平均曲柄功率比非支腿的要大得多，但非支腿的支腿的平均正功率和负支腿的功率要显着大于支腿。然而，由于受试者之间不对称性的高度可变性，对于这三个量中的任何一个，没有明显的线性关系与踩踏率有关。例如，对于11名受试者中只有4名，蹬踏速度与每条腿的总平均力量百分比差异之间存在显着的线性关系，并且这些关系的性质是不同的（例如正斜率与负斜率）。得出的结论是，踩踏不对称性在受试者之间变化很大，并且各个受试者的踩踏率可能会表现出不同的系统变化，具体取决于感兴趣的数量。

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