不同踏蹬频率下自行车运动员踏蹬力研究

Investigation of Pedaling Force at Different Cadence in Cycle-ergometer

利用SRM功率车以及安装在功率车上的测力系统(Powertec-System)研究不同踏蹬频率下场地自行车运动员一个踏蹬周期内作用于曲柄的切向踏蹬力特征。以8名自行车运动员为研究对象,在SRM功率车上进行10min、90rpm、120w的准备活动后,进行阻力负荷为500watt的骑行,踏蹬频率分别为100、120、130、140rpm,顺序随机选择,骑行稳定后,采集连续5s的踏蹬力数据。结果表明,随着踏蹬频率的提高,作用在左、右两侧曲柄的切向踏蹬力分量的正均值、均值、最大值减小,两侧切向踏蹬力分量之和的均值及峰值也减小(p<0.01);左、右侧正切向踏蹬力分量的起止位置、最值位置、双侧切向踏蹬力分量之和的峰值位置均随着踏蹬频率的增大而提前(p<0.01);在踏蹬周期的下半段,踏蹬频率越高,切向踏蹬力曲线越低,在踏蹬周期的上半段,踏蹬频率越高,切向踏蹬力曲线越高。

This study examined the tangential peal force applied on the crank in cycling at different cadence using SRM high performance egrometer and Powertec system. The pedal force data were collected from eight subjects at 500W across cadence ranging from 100 to 140 RPM. Results showed that the positive average, average maximum of both crank tangential pedal force（Fe） , the average and peak of the sum of both crank systematically decreased as cadence increased （p〈 0. 01）. The position of start and end of left and right positive average Fe, maximum and minimum of both crank Fe, peak of the sum of both crank Fe systematically advanced as cadence increased （p〈0.01）. The higher the cadence, the lower the Fe curve in top half of cycling and the higher the cadence, the higher the Fe curve in bottom half of cycling.