**4.1 Discussion of the obtained results**

According to **Table 2**, we construct the following graphs to assess the asymmetry in the muscles. The graph shows the results according to the angular values on the horizontal axis and the results according to the power values on the vertical axis (**Figure 8**). As can be seen from the graph, the muscle strengths in the right and left legs differ from each other at certain angular velocity values during abduction. At some angular velocity values, the muscle forces in the right and left legs are the same (30°/sec, 60°/sec, 180°/sec, 360°/sec), and these values indicate that there is no asymmetry. We do not take these prices into account. At different values of angular velocity, the asymmetry

**Figure 8.** *Abduction of the right and left leg (thigh).*

*Methods and Tools for Assessing Muscle Asymmetry in the Analysis of Electromyographic… DOI: http://dx.doi.org/10.5772/intechopen.103061*

#### **Figure 9.**

*Histogram for asymmetry assessment during right and left leg abduction.*

between the right and left foot is also different. At some values, the asymmetry is less noticeable (120°/sec, 210°/sec, 300°/sec, 330°/sec, 390°/sec, 450°/sec). At some values, there is a sharp asymmetry (90°/sec, 150°/sec, 240°/sec, 270°/sec).

The histogram of the results is shown in **Figure 9**.

#### **4.2 The result**

The minimum difference between right and left muscle strength is 5 W/kg, and the maximum difference is 30 W/kg. Given that the difference between these values is 25 W/kg, the difference in power values of 12 + 5, i.e. 17 W kg and below, in the assessment of asymmetry during abduction between the right and left arm is a natural asymmetry, and values above 17 W/kg it would be more correct to accept the existing asymmetry.

The minimum difference between right and left muscle strength is 5 W/kg, and the maximum difference is 70 W/kg. Since the difference between these values is 65 W/kg, differences in muscle strength of 32 + 5, i.e. 37 W/kg and below, can be considered as a natural asymmetry, and differences in muscle strength greater than 37 W/kg can be considered as existing asymmetry.
