Alterations in Surface Electromyography Are Associated with Subjective Masticatory Muscle Pain

Figure 2

(a). Moderate correlation between electric values and palpation-induced pain of temporalis (y = 0.93 + 1.3x; r² = 0.695; ) and masseters (y = 1.1 + 1.1x; r² = 0.514; ). At the highest pain score (=3), the mean sEMG absolute value (expressed in mV ± SD) is significantly higher at the ATs compared to the MMs (5.16 ± 0.47 mV vs 4.73 ± 0.30 mV, respectively; ). (b) Pearson’s analysis of single muscle sEMG findings and tenderness: strong correlation for RAT (y = 0.54 + 1.4x; r² = 0.776; ); moderate correlation for LAT (y = 1.3 + 1.2 · x; r² = 0.644; ); moderate-low correlation for RMM (y = 1.3 + 0.96·x; r² = 0.431; ); moderate correlation for LMM (y = 0.81 + 1.2 · x; r² = 0.581—).

(a)

(b)