Hill Christopher, DeBusk Hunter, Knight Adam, Chander Harish
Department of Kinesiology and Physical Education, Northern Illinois University, Dekalb, IL 60115, USA.
Applied Cognitive Sciences, Mica, WA 99023, USA.
Sports (Basel). 2020 Apr 28;8(5):58. doi: 10.3390/sports8050058.
Maintaining upright standing balance is critical for military personal. The impact of military footwear and occupation-related fatigue on muscle activity during balance performance has been previously documented. However, the current literature has not provided a muscle activation profile of the lower extremity during challenging conditions such as unilateral balance trials. Twenty-two recreationally active male participants (age: 22.2 ± 2.7 years; height: 177 ± 6.8 cm; mass: 79.8 ± 9.7 kg) donned two styles of military footwear (minimalist and standard) and performed a military style workload. Unilateral static balance was accessed before (PRE) and after (POST) the workload as surface electromyography was recorded on the right lower extremity. This study found that the minimalist footwear increased muscle activation prior to the workload compared to the standard footwear (co-contraction index mean difference: 0.149), whereas the standard footwear increased muscle activity after the workload (co-contraction index mean difference: 0.097). These findings suggest that footwear design characteristics affect lower extremity muscle activity differently depending on the workload condition. These findings intend to aid in the design of military footwear to maximize balance performance in a military population.
保持直立站立平衡对军人至关重要。先前已有文献记载军靴和职业相关疲劳对平衡表现期间肌肉活动的影响。然而，目前的文献尚未提供在诸如单侧平衡试验等具有挑战性的条件下下肢的肌肉激活情况。22名有运动习惯的男性参与者（年龄：22.2±2.7岁；身高：177±6.8厘米；体重：79.8±9.7千克）穿着两种款式的军靴（简约型和标准型）并执行军事风格的工作负荷。在工作负荷前后分别进行单侧静态平衡测试，同时记录右下肢的表面肌电图。本研究发现，与标准军靴相比，简约型军靴在工作负荷前增加了肌肉激活（共同收缩指数平均差异：0.149），而标准军靴在工作负荷后增加了肌肉活动（共同收缩指数平均差异：0.097）。这些发现表明，根据工作负荷条件，军靴设计特点对下肢肌肉活动的影响有所不同。这些发现旨在帮助设计军靴，以最大限度地提高军人的平衡表现。
