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首页> 外文期刊>Sports biomechanics >Changes in performance and poling kinetics during cross-country sprint skiing competition using the double-poling technique
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Changes in performance and poling kinetics during cross-country sprint skiing competition using the double-poling technique

机译：使用双极化技术在越野冲刺滑雪比赛中的表现和极化动力学变化

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摘要

In this study, changes in skiing performance and poling kinetics during a simulated cross-country sprint skiing competition were investigated. Twelve elite male cross-country skiers performed simulated sprint competition (4 X 1,150m heat with 20 min recovery between the heats) using the double-poling technique. Vertical and horizontal pole forces and cycle characteristics were measured using a force plate system (20-m long) during the starting spurt, racing speed, and finishing spurt of each heat. Moreover, heat and 20-m phase velocities were determined. Vertical and horizontal pole impulses as well as mean cycle length were calculated. The velocities of heats decreased by 2.7 ± 1.7% (p = 0.003) over the simulated competition. The 20-m spurting velocity decreased by 16 ± 5% (p < 0.002) and poling time increased by 18 ± 9% (p < 0.003) in spurt phases within heats. Vertical and horizontal poling impulses did not change significantly during the simulation; however, the mean forces decreased (p < 0.039) (vertical by 24 ±11% and horizontal by 20 ± 10%) within heats but not between the heats. Decreased heat velocities over the simulated sprint and spurting velocities within heats indicated fatigue among the skiers. Fatigue was also manifested by decreased pole force production and increased poling time.
机译：在这项研究中，研究了越野越野冲刺滑雪比赛中滑雪运动性能和极化动力的变化。 12名精英男子越野滑雪者使用双极化技术进行了模拟的短跑比赛（4 X 1,150m热量，两次加热之间有20分钟的恢复）。在每次热的开始突增，赛车速度和最终突增期间，使用测力板系统（长20 m）测量垂直和水平极力以及循环特性。此外，确定了热和20-m相速度。计算了垂直和水平极脉冲以及平均周期长度。在模拟竞争中，发热量降低了2.7±1.7％（p = 0.003）。在加热期间，在喷射阶段，20 m的喷射速度降低了16±5％（p <0.002），极化时间增加了18±9％（p <0.003）。在模拟过程中，垂直和水平极化脉冲没有明显变化。但是，平均力在加热时降低（p <0.039）（垂直降低24±11％，水平降低20±10％），但在加热之间不降低。在模拟的冲刺过程中，热速度下降，而热内的喷射速度表明滑雪者疲劳。极力产生的减少和极化时间的增加也表明了疲劳。

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