Aspetar, Orthopaedic and Sports Medicine Hospital, FIFA Medical Centre of Excellence, Doha, Qatar.
Centre for Health, Activity and Rehabilitation Research (CHEARR), Queen Margaret University, Edinburgh, UK.
Eur J Appl Physiol. 2022 May;122(5):1179-1187. doi: 10.1007/s00421-022-04903-9. Epub 2022 Feb 24.
We determined whether fatigue modifies the effect of custom foot orthoses manufactured from ethyl-vinyl acetate (EVA) and expanded thermoplastic polyurethane (TPU) materials, both compared to standardized footwear (CON), on running mechanics, running economy, and perceived comfort. Eighteen well-trained, males ran on an instrumented treadmill for 6 min at the speed corresponding to their first ventilatory threshold (13.8 ± 1.1 km/h) in three footwear conditions (CON, EVA, and TPU). Immediately after completion of a repeated-sprints exercise (8 × 5 s treadmill sprints, rest = 25 s), these run tests were replicated. Running mechanics, running economy and perceived comfort were determined. Two-way repeated measures ANOVA [condition (CON, EVA, and TPU) × fatigue (fresh and fatigued)] were conducted. Flight time shortened (P = 0.026), peak braking (P = 0.016) and push-off (P = 0.032) forces decreased and vertical stiffness increased (P = 0.014) from before to after the repeated-sprint exercise, independent of footwear condition. There was a global fatigue-induced deterioration in running economy (- 1.6 ± 0.4%; P < 0.001). There was no significant condition × fatigue [except mean loading rate (P = 0.046)] for the large majority of biomechanical, cardio-respiratory [except minute ventilation (P = 0.020) and breathing frequency (P = 0.019)] and perceived comfort variables. Acute intense fatigue does not modify the effect of custom foot orthoses with different resilience characteristics on running mechanics, running economy and perceived comfort.
我们确定了在跑步力学、跑步经济性和感知舒适度方面，与标准鞋（CON）相比，由乙烯-醋酸乙烯酯（EVA）和膨胀热塑性聚氨酯（TPU）材料制成的定制足弓支撑垫是否会因疲劳而改变效果。18 名训练有素的男性以其第一通气阈值（13.8 ± 1.1 km/h）对应的速度在三种鞋类条件（CON、EVA 和 TPU）下在带仪器的跑步机上跑 6 分钟。在完成重复短跑运动（8 × 5 s 跑步机短跑，休息 = 25 s）后，立即重复这些跑步测试。确定跑步力学、跑步经济性和感知舒适度。进行了双因素重复测量方差分析[条件（CON、EVA 和 TPU）×疲劳（新鲜和疲劳）]。与疲劳前相比，重复短跑运动后飞行时间缩短（P = 0.026），峰值制动（P = 0.016）和推进力（P = 0.032）下降，垂直刚度增加（P = 0.014），与鞋类条件无关。在很大程度上，除了平均加载率（P = 0.046）外，由于疲劳引起的跑步经济性普遍恶化（-1.6 ± 0.4%；P < 0.001）。除了平均加载率（P = 0.046）外，对于大多数生物力学、心肺[除分钟通气量（P = 0.020）和呼吸频率（P = 0.019）]和感知舒适度变量，没有显著的条件×疲劳[除了平均加载率（P = 0.046）外]。急性剧烈疲劳不会改变具有不同弹性特性的定制足弓支撑垫对跑步力学、跑步经济性和感知舒适度的影响。
