a English Institute of Sport , Manchester Institute of Health and Performance , Manchester , UK.
b Department of Sport, Exercise and Rehabilitation , Northumbria University , Newcastle upon Tyne , UK.
Eur J Sport Sci. 2019 Mar;19(2):192-198. doi: 10.1080/17461391.2018.1495768. Epub 2018 Jul 14.
Body position is known to alter power production and affect cycling performance. The aim of this study was to compare mechanical power output in two riding positions, and to calculate the effects on critical power (CP) and W' estimates. Seven trained cyclists completed three peak power output efforts and three fixed-duration trial (3-, 5- and 12-min) riding with their hands on the brake lever hoods (BLH), or in a time trial position (TTP). A repeated-measures analysis of variance showed that mean power output during the 5-min trial was significantly different between BLH and TTP positions, resulting in a significantly lower estimate of CP, but not W', for the TTP trial. In addition, TTP decreased the performance during each trial and increased the percentage difference between BLH and TTP with greater trial duration. There were no differences in pedal cadence or heart rate during the 3-min trial; however, TTP results for the 12-min trial showed a significant fall in pedal cadence and a significant rise in heart rate. The findings suggest that cycling position affects power output and influences consequent CP values. Therefore, cyclists and coaches should consider the cycling position used when calculating CP.
身体姿势已知会改变动力输出并影响骑行表现。本研究的目的是比较两种骑行姿势下的机械动力输出，并计算对临界功率（CP）和 W'估计值的影响。七名经过训练的自行车手在刹车杆罩（BLH）上完成了三次最大功率输出努力和三次固定持续时间的试验（3、5 和 12 分钟），或者在计时赛位置（TTP）上进行试验。重复测量方差分析显示，5 分钟试验期间的平均功率输出在 BLH 和 TTP 位置之间存在显著差异，导致 TTP 试验的 CP 估计值显著降低，但 W'值没有降低。此外，TTP 降低了每个试验的表现，并随着试验持续时间的增加增加了 BLH 和 TTP 之间的百分比差异。3 分钟试验时的踏频或心率没有差异；然而，12 分钟试验的 TTP 结果显示踏频显著下降，心率显著上升。研究结果表明，骑行姿势会影响动力输出，并影响随后的 CP 值。因此，自行车手和教练在计算 CP 时应考虑使用的骑行姿势。
