Gafner Simone C, Hoevel Veronika, Punt Ilona M, Schmid Stefan, Armand Stephane, Allet Lara
Department of Physiotherapy, HES-SO// University of Applied Sciences and Arts of Western Switzerland, Geneva, Switzerland.
Department of Health Professions, Bern University of Applied Sciences, Bern, Switzerland.
J Electromyogr Kinesiol. 2018 Dec;43:75-81. doi: 10.1016/j.jelekin.2018.09.004. Epub 2018 Sep 12.
Diminished hip abductor strength decreases postural control which is a parameter that is associated with an increased risk of ankle sprains. In our study we evaluated the influence of hip abductor fatigue on sagittal plane ankle kinematics and shank muscle activity during a single-leg forward jump. Sagittal ankle plane kinematics are important in ankle sprains but less studied than frontal plane kinematics. Therefore, we evaluated differences in sagittal ankle kinematics (12-camera motion capture system) and lower limb surface electromyographic muscle activity in 20 healthy, recreationally active adults (9 females, 11 males, mean age 30.3 SD 4.0 years, mean BMI 23.6 SD 2.8 kg/m) before and after a hip abductor fatigue protocol (200-ms prior, at and in the 250-ms following initial contact (IC)). After fatigue, the maximal ankle plantar-flexion angle decreased prior to IC (median 3.8° [interquartile range 0.1, 7.2], p = 0.014), at IC (4.1° [-0.3, 5.0], p = 0.027) and post IC (4.1° [-1.3, 5.0] p = 0.036). Gastrocnemius activity onset was delayed (-28.0 ms [-44.0, 0.0], p < 0.01). Average activity of the tibialis anterior increased prior to IC (pre-fatigue 19.32% [14.89, 33.45], post-fatigue 28.95% [18.49, 34.81], p < 0.05). Hip-abductor fatigue influenced sagittal ankle kinematics and shank muscle activity during single-leg landings.
髋外展肌力量减弱会降低姿势控制能力，而姿势控制是一个与踝关节扭伤风险增加相关的参数。在我们的研究中，我们评估了髋外展肌疲劳对单腿前跳过程中矢状面踝关节运动学和小腿肌肉活动的影响。矢状面踝关节运动学在踝关节扭伤中很重要，但与额状面运动学相比研究较少。因此，我们评估了20名健康、有运动习惯的成年人（9名女性，11名男性，平均年龄30.3岁，标准差4.0岁，平均体重指数23.6 kg/m，标准差2.8 kg/m）在进行髋外展肌疲劳方案前后（初始接触前200毫秒、初始接触时以及初始接触后250毫秒）矢状面踝关节运动学（12台摄像机运动捕捉系统）和下肢表面肌电图肌肉活动的差异。疲劳后，在初始接触前最大踝关节跖屈角度减小（中位数3.8°[四分位间距0.1, 7.2]，p = 0.014），在初始接触时（4.1°[-0.3, 5.0]，p = 0.027）以及初始接触后（4.1°[-1.3, 5.0]，p = 0.036）。腓肠肌活动起始延迟（-
