PDF(Pubmed)
Abstract：
This study aimed to examine the relationship between the trunk impairment level and the trunk kinematic characteristics during alpine sit-skiing from a classification perspective. Three Paralympic medalists in sitting classes (LW10-2, LW11, and LW12-2) participated in the present study. To simulate the racing conditions, giant slalom gates were set. To measure the kinematics of the skier and sit-ski during skiing, a motion capture method with inertial measurement units was used. The muscle activities of the trunk muscles were evaluated using electromyography. Chest lateral flexion, chest flexion, and hip flexion/extension angle during sit-skiing were reduced due to impairment. Additionally, the insufficient lateral flexion (angulation) caused a decrease in edging angle, and that the insufficient chest and hip flexion/extension caused a lower loading in the latter half of the turn through smaller vertical movement. Since edging angle and loading are key factors in ski control, the three joint motions could be measures of sport-specific activity limitation in sit-skiing classification. Between the LW10-2 and LW11 skiers, no distinct differences in trunk kinematics were found. Assuming the scaling factor of race time as a measure of skiing performance, one possible reason is that the difference in skiing performance the LW10-2 and LW11 skiers is considerably smaller relative to differences between the LW11 and LW12-2 skiers. There were no distinct differences among classes in the results of muscle activity, and therefore, this information appears to play a minimal role for classification.
摘要：
本研究旨在从分类的角度研究高山坐式滑雪过程中躯干损伤水平与躯干运动学特征之间的关系。静坐班的三名残奥会奖牌获得者（LW10-2，LW11和LW12-2）参加了本研究。为了模拟比赛条件，设置了巨大的激流回旋门。为了测量滑雪时滑雪者和坐式滑雪的运动学，使用惯性测量单元的运动捕获方法。使用肌电图评估躯干肌肉的肌肉活动。胸部侧向屈曲,胸部屈曲,和髋关节屈曲/伸展角度在坐式滑雪减少由于损伤。此外,不足的侧向弯曲（角度）导致磨边角减小，胸部和髋部弯曲/伸展不足通过较小的垂直运动在转弯的后半部引起较低的负荷。由于磨边角度和载荷是滑雪控制的关键因素，这三种关节运动可以作为静坐滑雪分类中特定运动活动限制的量度。在LW10-2和LW11滑雪者之间，躯干运动学没有明显差异。假设比赛时间的比例因子作为滑雪成绩的衡量标准，一个可能的原因是LW10-2和LW11滑雪者的滑雪性能差异相对于LW11和LW12-2滑雪者之间的差异要小得多。肌肉活动的结果在类别之间没有明显差异，因此,这些信息似乎对分类起着最小的作用。
