Effect of Orthoses on Changes in Neuromuscular Control and Aerobic Cost of a 1-h Run
Effect of Orthoses on Changes in Neuromuscular Control and Aerobic Cost of a 1-h Run
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DOI：
10.1249/mss.0b013e31822037ca
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发表时间：
2011-12-01
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影响因子：
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通讯作者：
Racinais, Sebastien
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文献类型：
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作者：
Kelly, Luke A.;Girard, Olivier;Racinais, Sebastien
凯利湖一、O.吉拉德，和S.种族歧视。矫形器对神经肌肉控制和1小时跑有氧消耗变化的影响。医学科学体育锻炼：第43卷，第12期，第113页。2335-2343，2011。目的：本研究的目的是确定足部矫形器对神经肌肉控制和跑步的有氧消耗的影响。方法：12名休闲运动员在跑步机上以恒定速度（即，比他们的第一个通气阈值高10%），有和没有定制模制的足部矫形器，以平衡顺序。在跑步过程中，从2分钟后开始，每隔8分钟记录5块下肢肌肉的表面肌电图活动，以及耗氧量和心率。在跑步前后进行一系列神经肌肉测试，包括踝跖屈肌的随意收缩和电诱发收缩。结果：腓骨长肌均方根振幅随时间延长而降低，与条件无关（-18.9%，P < 0.01）。当使用矫形器跑步时，股内侧肌（-13.3%，P < 0.02）和腓肠肌内侧肌（-10.7%，P < 0.05）的均方根信号幅度较低，同时腓骨长肌爆裂持续时间增加（+14.7%，P < 0.05）。氧耗量无显著性差异（P > 0.05），而戴足矫形器时心率显著降低（-3%，P < 0.02）。最大肌力（-9%，P < 0.01）、标准化EMG活动（-17%，P < 0.001）和峰值抽搐扭矩（-14%，P < 0.01）从运动前到运动后均下降，与条件无关。在使用足部矫形器跑步后，在前200 ms内，疲劳引起的扭矩发展率下降较小（-6% vs-33%，P < 0.01）。结论：穿足矫形器改变神经肌肉控制在一个次最大的1小时跑步机运行，并部分保护由此产生的疲劳引起的减少快速力的发展特征的跖屈肌。然而，这些变化可能太小，无法改变跑步的有氧消耗。
KELLY, L. A., O. GIRARD, and S. RACINAIS. Effect of Orthoses on Changes in Neuromuscular Control and Aerobic Cost of a 1-h Run. Med. Sci. Sports Exerc., Vol. 43, No. 12, pp. 2335-2343, 2011. 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.