University of Wisconsin La Crosse, Health Professions, 1725 State Street, La Crosse, WI 54601, USA.
Sports Biomech. 2012 Nov;11(4):464-72. doi: 10.1080/14763141.2012.699547.
This study assessed the effect of step width during running on factors related to iliotibial band (ITB) syndrome. Three-dimensional (3D) kinematics and kinetics were recorded from 15 healthy recreational runners during overground running under various step width conditions (preferred and at least +/- 5% of their leg length). Strain and strain rate were estimated from a musculoskeletal model of the lower extremity. Greater ITB strain and strain rate were found in the narrower step width condition (p < 0.001, p = 0.040). ITB strain was significantly (p < 0.001) greater in the narrow condition than the preferred and wide conditions and it was greater in the preferred condition than the wide condition. ITB strain rate was significantly greater in the narrow condition than the wide condition (p = 0.020). Polynomial contrasts revealed a linear increase in both ITB strain and strain rate with decreasing step width. We conclude that relatively small decreases in step width can substantially increase ITB strain as well as strain rates. Increasing step width during running, especially in persons whose running style is characterized by a narrow step width, may be beneficial in the treatment and prevention of running-related ITB syndrome.
本研究评估了跑步时步幅对与阔筋膜张肌（ITB）综合征相关因素的影响。15 名健康的休闲跑步者在不同步幅条件（惯用步幅和至少 +/- 5%腿长）下进行地面跑步时，记录了三维（3D）运动学和动力学。下肢肌肉骨骼模型估计了应变和应变速率。在较窄的步幅条件下，ITB 的应变和应变速率更大（p < 0.001，p = 0.040）。与惯用步幅和宽步幅条件相比，在窄步幅条件下 ITB 的应变显著更大（p < 0.001），且在惯用步幅条件下 ITB 的应变显著大于宽步幅条件（p < 0.001）。与宽步幅条件相比，在窄步幅条件下 ITB 的应变速率显著更大（p = 0.020）。多项式对比显示，随着步幅的减小，ITB 的应变和应变速率呈线性增加。我们的结论是，步幅的相对较小的减小会显著增加 ITB 的应变和应变速率。在跑步过程中增加步幅，尤其是对于那些跑步姿势以步幅较窄为特征的人，可能有助于治疗和预防与跑步相关的 ITB 综合征。
