## 3 Results  
Figure 3 shows the elbow extensor muscle activity amplitude in different imagery conditions. The condition of AudioVisual pattern has a higher muscles activity amplitude than other conditions. Repeated measures of analysis of variance were used to compare the amplitude of muscle activity in different conditions (No pattern, Visual pattern, and AudioVisual pattern). Since the presumption of homogeneity of variance-covariance was not established (Mauchly's W = 0.414, \(p\) = 0.001), the Greenhouse-Geisser method was used to analyze the data. The results showed that the effect of the condition is significant (F1.261, 30.274 = 22.213, emphp = 0.001, eta squared = 0.481) and there was a significant difference in the imagery in different conditions. The result of [PERSON]'s post hoc test also indicated that there are significant differences between conditions, so that the AudioVisual pattern had more activity than Visual (MD = 0.0017, \(p\) = 0.001) and No pattern (MD = 0.0019, \(p\) = 0.001) conditions. However, no significant difference was observed between the Visual pattern and No pattern conditions (MD = \(-\)0.0002, \(p\) = 0.615). Figure 4 illustrates the activity amplitude of elbow joint extensor muscles in different imagery conditions and perspectives. The average activity amplitude of the elbow extensor muscles in the conditions of AudioVisual-internal imagery and AudioVisual-kinesthetic imagery was higher than other conditions. In the two conditions of Visual pattern and  
Figure 3: Range of elbow extensor muscle activity in three conditions: No pattern, Visual pattern, and AudioVisual pattern; ***\(p\) < 0.001, ***\(p\) < 0.0001. AudioVisual pattern, internal and kinesthetic imagery results in more muscle activity than external imagery. As shown in Figure 3, the average activity amplitude of the elbow extensor muscles in the conditions of AudioVisual-internal imagery and AudioVisual-kinesthetic imagery is more than in other conditions. In the two other conditions of Visual pattern and AudioVisual pattern, internal and kinesthetic imagery results in more muscle activity than external imagery. Repeated measures ANOVA was used to compare the amplitude of muscle activity in different conditions. Since the presumption of homogeneity of variance-covariance was not established (Mauchly's W = 0.0015, \(p\) = 0.001), the Greenhouse-Geisser method was used to analyze the data. The results indicated that the effect of the test is significant (F2.876, 69.029 = 11.178, \(p\) = 0.001, eta Squared = 0.318) and there was a significant difference between different imagery conditions. In the following, [PERSON]'s post hoc test indicated that AudioVisual-kinesthetic imagery is better than other conditions (except for AudioVisual-internal imagery). Additionally, the results showed that the AudioVisual-internal condition is significantly better than the Visual-internal and No pattern conditions. In addition, the present study investigated the relationship between the participants' auditory mental imagery ability and muscle activity amplitude. The results showed that there is a significant positive relationship between the auditory mental imagery ability and the muscle activity amplitude only in the AudioVisual pattern condition (r = 0.541, emphp = 0.005). The results also revealed that there is a significant positive relationship between Visual imagery ability and muscle activity amplitude in all three conditions: in No pattern (r = 0.410, \(p\) = 0.42), Visual pattern (r = 0.481, \(p\) = 0.015) and AudioVisual pattern condition (r = 0.459, \(p\) = 0.021), respectively. Figure 4: Activity range of elbow extensor muscles in three different conditions of No pattern, Visual pattern, and AudioVisual pattern and in three different perspectives of external, internal, and kinesthetic imagery; \({}^{*}\)\(p\)\(<\) 0.05, \({}^{**}\)\(p\)\(<\) 0.01.