Figure 6. Ratio of root mean square of electromyogram (RMS-EMG) of the moving to that of non-moving sides of the upper, central, and lower portions of the rectus abdominis (URA, CRA, and LRA, respectively) and the external and internal obliques (EO and IO, respectively) during the eccentric phase of the asymmetric abdominal exercises. The abbreviations above the box indicate exercises with a statistically significant difference from the corresponding exercise (p < 0.05). The circle indicates an outlier value in the ratio of RMS-EMG. SUT, sit-up twist; OLR, oblique leg raise; SB, side bridge; SBE, side bridge roll out with the elbow; SBF, side bridge roll out with the foot.