During all bridging exercises, the ratio of the internal oblique to the rectus abdominis was
very high due to minimal relative activity of the rectus abdominis. In general, the ratio of the
internal/external abdominal oblique activity was about 1. However, during the unilateral bridging
exercise, the ipsilateral internal/external abdominal oblique activity ratio was 2.79 as a consequence
of the significant higher relative activity of the internal oblique compared to the external oblique.
The relative muscle activity and the ratios of the back muscles demonstrated similar activity levels
for all back muscles, resulting in ratios about 1.
C