便携式测力板和压力鞋垫系统在高山滑雪中测定的地面反作用力的比较。
A comparison of ground reaction forces determined by portable force-plate and pressure-insole systems in alpine skiing.
出版信息
J Sports Sci Med. 2011 Dec 1;10(4):754-62. eCollection 2011.
For the determination of ground reaction forces in alpine skiing, pressure insole (PI) systems and portable force plate (FP) systems are well known and widely used in previous studies. The purposes of this study were 1) to provide reference data for the vertical component of the ground reaction forces (vGRF) during alpine skiing measured by the PI and FP systems, and 2) to analyze whether the differences in the vGRF measured by the PI and the FP depend on a skier's level, skiing mode and pitch. Ten expert and ten intermediate level skiers performed 10 double turns with the skiing technique "Carving in Short Radii" as High Dynamic Skiing mode and "Parallel Ski Steering in Long Radii" as Low Dynamic Skiing mode on both the steep (23 °) and the flat (15 °) slope twice. All subjects skied with both the PI and the FP system simultaneously. During the outside phase, the mean vGRF and the maximum vGRF determined by the FP are greater than the PI (p < 0.01). Additionally during the inside phase, the mean vGRF determined by the FP were greater than the PI (p < 0.01). During the edge changing phases, the mean vGRF determined by the FP were greater than the PI (p < 0.01). However, the minimum vGRF during the edge changing phases determined by the FP were smaller than the PI (p < 0.01) in the High-Steep skiing modes of Experts and Intermediates (p < 0.001). We have found that generally, the PI system underestimates the total vGRF compared to the FP system. However, this difference depends not only the phase in the turn (inside, outside, edge changing), but also is affected by the skier's level, the skiing mode performed and pitch. Key pointsTypically, during the steering phases of the ski turns the total vGRFs measured by the pressure-insole system were lower compared to the portable force-plate system.However, in some skiing modes during the edge changing phase, the pressure-insole system overestimates the total vGRF compared to the portable force-plate system.Differences between the forces determined by the both systems depend on the phase in the turn (inside, outside, edge changing) and are affected additionally by the skier's level, the performed skiing mode and pitch.
对于高山滑雪中地面反作用力的测定，压力鞋垫（PI）系统和便携式测力板（FP）系统在之前的研究中被广泛应用。本研究的目的是：1）为 PI 和 FP 系统测量的高山滑雪中地面反作用力（vGRF）的垂直分量提供参考数据，2）分析 PI 和 FP 测量的 vGRF 差异是否取决于滑雪者的水平、滑雪模式和坡度。10 名专家级和 10 名中级水平的滑雪者在 23°和 15°的陡峭和平坦雪道上，分别以高动态滑雪模式（“短半径刻滑”）和低动态滑雪模式（“长半径平行滑转向”）各进行了 10 次双板转弯。所有受试者同时使用 PI 和 FP 系统进行滑雪。在外侧阶段，FP 确定的平均 vGRF 和最大 vGRF 大于 PI（p<0.01）。此外，在内侧阶段，FP 确定的平均 vGRF 大于 PI（p<0.01）。在变刃阶段，FP 确定的平均 vGRF 大于 PI（p<0.01）。然而，在高陡峭滑雪模式下，FP 确定的最小 vGRF 在变刃阶段小于 PI（p<0.01）（p<0.001）（专家和中级）。我们发现，通常情况下，PI 系统比 FP 系统低估总 vGRF。然而，这种差异不仅取决于转弯阶段（内侧、外侧、变刃），还受到滑雪者水平、所进行的滑雪模式和坡度的影响。关键点通常，在滑雪转弯的转向阶段，压力鞋垫系统测量的总 vGRF 低于便携式测力板系统。然而，在某些滑雪模式的变刃阶段，压力鞋垫系统比便携式测力板系统高估总 vGRF。两个系统确定的力之间的差异取决于转弯阶段（内侧、外侧、变刃），并且还受到滑雪者水平、所进行的滑雪模式和坡度的影响。
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