Zipser M Christopher, Plummer Hillary A, Kindstrand Nathan, Sum Johnathan C, Li Bernard, Michener Lori A
University of Southern California.
Andrews Research & Education Foundation.
Int J Sports Phys Ther. 2021 Apr 1;16(2):342-349. doi: 10.26603/001c.21415.
The single-leg step down task (SLSD) is a clinical tool to assess movement and control of the lower extremity and trunk. Hip abduction weakness may impact movement quality during the SLSD, however the relationships between movement and strength are unclear.
To determine the relationship between hip abduction isometric strength and movement during the SLSD of trunk lean, pelvic drop, knee valgus, and hip flexion.
Cross sectional, cohort study.
One hundred-eighteen Minor League baseball players (age=21.6 ± 2.0 years; n=68 pitchers, n=50 position players) participated. Bilateral hip abduction isometric strength was measured using a handheld dynamometer (HHD), and then multiplied by distance from the greater trochanter to the HHD and expressed as hip abduction torque. Video cameras captured the SLSD, with participants standing on one leg while lowering their contralateral heel to touchdown on the floor from a 0.203m (8in.) step. Trunk lean, trunk flexion, pelvic drop, knee valgus, and hip flexion were measured using Dartfish at heel touchdown. A value of 180° indicated no knee valgus. Pearson correlations examined the relationships between hip abduction torque and SLSD motions.
There were no significant correlations for position players. For pitchers, on the lead leg increased hip abduction torque weakly correlated with a decrease in knee valgus (r= 0.24, p=0.049). Also for pitchers on the trail leg, increased hip abduction torque weakly correlated with decreased pelvic drop (r= -0.28, p=0.021).
Hip abduction strength contributes to dynamic control of the trunk and legs. Specifically in pitchers, hip abduction weakness was related to increased movement of the lower extremity and lumbopelvic regions during the dynamic SLSD task. These deficits could translate to altered pitching performance and injury.
单腿下蹲任务（SLSD）是一种评估下肢和躯干运动及控制能力的临床工具。髋关节外展无力可能会影响SLSD期间的运动质量，然而运动与力量之间的关系尚不清楚。
确定在SLSD过程中，躯干倾斜、骨盆下降、膝外翻和髋关节屈曲时，髋关节外展等长肌力与运动之间的关系。
横断面队列研究。
118名小联盟棒球运动员（年龄=21.6±2.0岁；投手68名，内野手50名）参与研究。使用手持测力计（HHD）测量双侧髋关节外展等长肌力，然后乘以大转子到HHD的距离，以髋关节外展扭矩表示。摄像机记录SLSD过程，参与者单腿站立，将对侧脚跟从0.203米（8英寸）的台阶上降低到地面触地。在脚跟触地时，使用Dartfish测量躯干倾斜、躯干屈曲、骨盆下降、膝外翻和髋关节屈曲。180°表示无膝外翻。采用Pearson相关性分析来研究髋关节外展扭矩与SLSD动作之间的关系。
内野手之间无显著相关性。对于投手，在前导腿上，髋关节外展扭矩增加与膝外翻减少呈弱相关（r=0.24，p=0.049）。同样对于投手的后随腿，髋关节外展扭矩增加与骨盆下降减少呈弱相关（r=-0.28，p=0.021）。
髋关节外展力量有助于躯干和腿部的动态控制。特别是在投手中，髋关节外展无力与动态SLSD任务期间下肢和腰骶部区域的运动增加有关。这些缺陷可能会导致投球表现改变和受伤。
2级。
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