Human Movement Science Programme, Norwegian University of Science and Technology, Trondheim, Norway.
Scand J Med Sci Sports. 2013 Jun;23(3):295-302. doi: 10.1111/j.1600-0838.2011.01379.x. Epub 2011 Sep 13.
The purpose of the present study was to examine the effect of frequency on efficiency and performance during G3 roller ski skating. Eight well-trained male cross-country skiers performed three submaximal 5-min speeds (10, 13, and 16 km/h) and a time-to-exhaustion (TTE) performance (at 20 km/h) using the G3 skating technique using freely chosen, high, and low frequency at all four speeds. All tests were done using roller skis on a large treadmill at 5% incline. Gross efficiency (GE) was calculated as power divided by metabolic rate. Power was calculated as the sum of power against frictional forces and power against gravity. Metabolic rate was calculated from oxygen consumption and blood lactate concentration. Freely chosen frequency increased from 60 to 70 strokes/min as speed increased from 10 to 20 km/h. GE increased with power. At high power (20 km/h performance test), both efficiency and performance were significantly reduced by high frequency. In regard to choice of frequency during G3 roller ski skating, cross-country skiers seems to be self-optimized both in relation to energy saving (efficiency) and performance (TTE).
本研究的目的是检验在 G3 滚轮滑雪中频率对效率和表现的影响。8 名训练有素的男性越野滑雪运动员使用 G3 技术以高、中和低频率在四种速度下分别进行了三个亚最大的 5 分钟速度（10、13 和 16 公里/小时）和一个力竭时间（TTE）测试（20 公里/小时）。所有测试均在 5%坡度的大型跑步机上使用滚轮滑雪进行。总效率（GE）定义为功率除以代谢率。功率计算为克服摩擦力和重力的功率之和。代谢率由耗氧量和血乳酸浓度计算得出。频率从 10 公里/小时增加到 20 公里/小时时，自由选择的频率从 60 次/分钟增加到 70 次/分钟。GE 随功率增加而增加。在高功率（20 公里/小时的测试）下，高频会显著降低效率和性能。在 G3 滚轮滑雪中选择频率方面，越野滑雪运动员似乎在节能（效率）和表现（TTE）方面都实现了自我优化。
