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首页> 外文期刊>Medicine and science in sports and exercise >Effect of orthoses on changes in neuromuscular control and aerobic cost of a 1-h Run
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Effect of orthoses on changes in neuromuscular control and aerobic cost of a 1-h Run

机译：矫形器对1小时跑步神经肌肉控制和有氧运动成本的影响

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Purpose: The study's purpose was to determine the effect of foot orthoses on neuromuscular control and the aerobic cost of running. Methods: Twelve recreational athletes ran for 1 h on a treadmill at a constant velocity (i.e., 10% higher than their first ventilatory threshold) with and without custom-molded foot orthoses, in a counterbalanced order. Surface EMG activity of five lower limb muscles, together with oxygen consumption and HR, was recorded at 8-min intervals, starting after 2 min, during the run. A series of neuromuscular tests including voluntary and electrically evoked contractions of the ankle plantar flexors was performed before and after running. Results: Peroneus longus root mean square amplitude decreased with time, independently of the condition (-18.9%, P < 0.01). Lower root mean square signal amplitude for vastus medialis (-13.3%, P < 0.02) and gastrocnemius medialis (-10.7%, P < 0.05), combined with increased peroneus longus burst duration (+14.7%, P < 0.05), occurred when running with orthoses. There was no main effect of the condition for oxygen consumption (P > 0.05), whereas HR was significantly lowered while wearing foot orthoses (-3%, P < 0.02). Maximal strength capacity (-9%, P < 0.01), normalized EMG activity (-17%, P < 0.001), and peak twitch torque (-14%, P < 0.01) declined from before to after exercise, independently of the condition. Smaller fatigue-induced decrements in the rate of torque development within the first 200 ms (-6% vs-33%, P < 0.01) were reported after running with foot orthoses. Conclusions: Wearing foot orthoses alters neuromuscular control during a submaximal 1-h treadmill run and partly protects from the resulting fatigue-induced reductions in rapid force development characteristics of the plantar flexors. However, these changes may be too small to alter the aerobic cost of running.
机译：目的：该研究的目的是确定足部矫形器对神经肌肉控制的影响以及跑步的有氧运动成本。方法：十二名休闲运动员在跑步机上以恒定速度（即，比其第一通气阈值高10％）在跑步机上跑步1小时，并且有和没有按照习惯模制的矫形脚套以平衡的顺序进行。在跑步过程中，每隔2分钟开始以8分钟的间隔记录下肢五块肌肉的表面EMG活性以及氧气消耗和HR。跑步前后，进行了一系列神经肌肉试验，包括踝plant屈的自愿性和电诱发性收缩。结果：腓骨长根均方振幅随时间而降低，与条件无关（-18.9％，P <0.01）。当发生以下情况时，腓肠肌（-13.3％，P <0.02）和腓肠肌（-10.7％，P <0.05）的均方根信号振幅较低，并伴有腓肠肌长突持续时间延长（+ 14.7％，P <0.05）。与矫形器一起跑步。耗氧情况没有主要影响（P> 0.05），而穿足部矫形器时，HR显着降低（-3％，P <0.02）。从运动前到运动后，最大力量（-9％，P <0.01），正常的肌电活动（-17％，P <0.001）和峰值抽搐扭矩（-14％，P <0.01）从运动前到运动后下降。据报道，用脚矫形器跑步后，在最初的200 ms内，疲劳引起的扭矩发展率下降较小（-6％对-33％，P <0.01）。结论：足部矫形器的磨损在次最大的1小时跑步机跑步过程中改变了神经肌肉的控制，并部分地防止了由疲劳引起的足底屈肌快速力量发展特征的下降。但是，这些变化可能太小而无法改变有氧运动的成本。

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