LÖfquist Isak, BjÖrklund Glenn
Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, SWEDEN.
Int J Exerc Sci. 2020 Dec 1;13(1):1563-1573. doi: 10.70252/VAKF8512. eCollection 2020.
The purpose of this study was to investigate the magnitude of force a slopestyle skier is exposed to when landing either forward or switch in a big air jump. Ten male freeskiers (age 23 ± 6 years; height 179.2 ± 5.4 cm; body mass 72.5 ± 8.6 kg; mass of equipment 16.7 ± 1.4 kg; total mass 89.2 ± 8.6 kg) participated and each performed five 180 jumps and five switch 180 jumps in a randomized order. Forces were quantified using pressure insoles. The results showed a force of 1446 ± 367 N (2.04 ± 0.46 times body mass) for the 180 jump and a force of 1409 ± 257 N (1.99 ± 0.28 times body mass) for the switch 180 jump. There was no difference in force between the 180 jump and the switch 180 jump, p=0.582. There was a trend for the switch 180 for a correlation between a heavier body mass and a greater force (r = 0.604, r = 0.365, p = 0.064) as well as a heavier total mass and a greater force (r = 0.621, r = 0.385, p = 0.055). This study shows that the force when landing a big air jump is roughly twice the slopestyle skier's body mass, but no difference in force was seen between performing a 180 or a switch 180 jump. The force of twice the body mass could therefore be considered a minimum value for slopestyle skiing.
本研究的目的是调查自由式滑雪坡面障碍技巧运动员在大跳台向前或转体落地时所承受的力的大小。十名男性自由式滑雪运动员（年龄23±6岁；身高179.2±5.4厘米；体重72.5±8.6千克；装备质量16.7±1.4千克；总质量89.2±8.6千克）参与了研究，每人以随机顺序进行五次180度跳跃和五次转体180度跳跃。使用压力鞋垫对力进行量化。结果显示，180度跳跃时的力为1446±367牛（为体重的2.04±0.46倍），转体180度跳跃时的力为1409±257牛（为体重的1.99±0.28倍）。180度跳跃和转体180度跳跃之间的力没有差异，p=0.582。转体180度跳跃存在一种趋势，即体重较重与力较大之间存在相关性（r = 0.604，r = 0.365，p = 0.064），以及总质量较重与力较大之间存在相关性（r = 0.621，r = 0.385，p = 0.055）。本研究表明，大跳台落地时的力约为自由式滑雪坡面障碍技巧运动员体重的两倍，但在进行180度或转体180度跳跃时，力没有差异。因此，体重两倍的力可被视为自由式滑雪坡面障碍技巧的最小值。
