Hoffman M D, Clifford P S, Snyder A C, O'Hagan K P, Mittelstadt S W, Roberts M M, Drummond H A, Gaskill S E
Department of Physical Medicine, The Medical College of Wisconsin and VA Medical Center, Milwaukee 53295, USA.
Med Sci Sports Exerc. 1998 Feb;30(2):311-7. doi: 10.1097/00005768-199802000-00021.
The double pole technique (DP) has been shown to be more economical than the V1 skate technique (V1 ) on flat terrain. The objective of the present study was to compare these two techniques during uphill roller skiing. In addition, the physiological effects of changing roller ski rolling resistance was examined for V1.
Five female and five male competitive cross-country skiers roller skied 4-min bouts on a 5.2% incline while physiological measurements were made.
Oxygen uptake (VO2) values averaged 8% greater (P = 0.0004) with V1, whereas rating of perceived exertion (RPE) and blood lactate concentrations were higher (P < or = 0.002) with DP. Doubling the dynamic friction coefficient of the roller skis, which increased external power output by 16-17%, resulted in VO2 values with V1 that averaged 13% higher (P = 0.0006). This magnitude of change in roller ski rolling resistance did not cause a statistical change in the relationship of VO2 with RPE.
These findings suggest that 1) grade has little effect on relative economies of DP and V1, possibly because of a lower effectiveness of force application with V1 when going uphill, and 2) large differences in roller ski rolling resistance should have no effect on the cardiovascular training adaptations that result from uphill roller skiing with V1.
双杖技术（DP）在平坦地形上已被证明比V1滑板技术（V1）更经济。本研究的目的是比较这两种技术在上坡轮滑滑雪时的情况。此外，还研究了改变V1轮滑滑雪滚动阻力的生理效应。
五名女性和五名男性越野滑雪运动员在5.2%的坡度上进行4分钟的轮滑滑雪，同时进行生理测量。
V1的摄氧量（VO2）值平均高8%（P = 0.0004），而自觉用力程度（RPE）和血乳酸浓度在DP时更高（P≤0.002）。将轮滑滑雪板的动摩擦系数加倍，使外部功率输出增加16 - 17%，导致V1的VO2值平均高13%（P = 0.0006）。轮滑滑雪滚动阻力的这种变化幅度并未导致VO2与RPE关系的统计学变化。
这些发现表明，1）坡度对DP和V1的相对经济性影响很小，可能是因为上坡时V1的力施加效率较低；2）轮滑滑雪滚动阻力的巨大差异对上坡V1轮滑滑雪产生的心血管训练适应性应无影响。
