Research Article

Validity and Reliability of the Newly Developed Surface Electromyography Device for Measuring Muscle Activity during Voluntary Isometric Contraction

Figure 4

Agreement between BTS-FREEEMG1000 and PSL-EMG-Tr1. Means on the x-axis are the average of two sEMG devices for % MVIC; differences on the y-axis are the difference between the two devices. The 95% limits of agreement (LOA) are depicted (dashed lines). The error bars represent the 95% confidence interval for both the upper and lower limits of agreement. The 95% LOA include zero, indicating no systematic bias in performance between the two devices. (a) 40% MVIC (biceps brachii); (b) 80% MVIC (biceps brachii); (c) 40% MVIC (rectus femoris); (d) 80% MVIC (rectus femoris).
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