No Difference in Transverse Abdominis Activation Ratio between Healthy and Asymptomatic Low Back Pain Patients during Therapeutic Exercise
Figure 4
Ultrasound image of the TrA and calculation of TrA activation ratio. Resting image is on (a) and contracted image is on (b) (Activation ratio = TrA contracted (mm)/TrA rest (mm)). EO = external oblique; IO = internal oblique; TrA = transverse abdominis. The red arrow indicates the thickness of the TrA.
