UCT/MRC Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, Faculty of Health Sciences, The University of Cape Town, Cape Town, South Africa.
J Electromyogr Kinesiol. 2011 Aug;21(4):579-86. doi: 10.1016/j.jelekin.2011.03.009. Epub 2011 Apr 30.
We evaluated possible methods of normalising EMG measured during running. MVC, Sprint and 70% Peak Running Speed methods were evaluated and their repeatability, reliability and sensitivity to incremental running speed were compared. Twelve runners performed the same experimental protocol on three separate occasions. Each day, subjects firstly performed MVCs, followed by a 20 m maximal sprint (with a 20-30 m run-up). Following this, they performed the peak running speed (PRS) test until exhaustion. After which they ran at 70% of PRS for 5 laps. Results indicated that normalising EMG data to MVC and Sprint methods are more repeatable for VM, BF, MG and RF, VL, LG, respectively, with the average ICC>0.80. The 70% PRS demonstrated poor to fair levels of repeatability ranging between ICC 0.27 and 0.70. Whereas the 70% PRS method had the least intra-subject variability and the greatest sensitivity to increasing running speeds. More specifically, demonstrating significant changes in muscle activity in VM with increasing running speed while MVC and Sprint methods were unable to detect these changes. The dynamic methods were the most appropriate for EMG normalisation showing repeatability, better intra-subject reliability and better sensitivity during running over different days and for once-off measurements.
我们评估了在跑步过程中测量肌电图的正常化方法。评估了 MVC、冲刺和 70%峰值跑步速度方法，并比较了它们的重复性、可靠性和对递增跑步速度的敏感性。12 名跑步者在三个不同的场合进行了相同的实验方案。每天，受试者首先进行 MVC，然后进行 20 米最大冲刺（20-30 米起跑）。在此之后，他们进行峰值跑步速度（PRS）测试，直到力竭。之后，他们以 70%的 PRS 跑 5 圈。结果表明，对于 VM、BF、MG 和 RF、VL、LG，将肌电图数据归一化为 MVC 和冲刺方法更具重复性，平均 ICC>0.80。70%PRS 的重复性较差，ICC 在 0.27 到 0.70 之间。而 70%PRS 方法的个体内变异性最小，对增加的跑步速度最敏感。更具体地说，与 MVC 和冲刺方法无法检测到这些变化相比，70%PRS 方法在增加跑步速度时显示出 VM 中肌肉活动的显著变化。动态方法最适合肌电图归一化，在不同日子和一次性测量中具有重复性、更好的个体内可靠性和更好的敏感性。
