Activation of the Abdominal Transverse Muscle (PBU)
pain
The interaction effect between time and treatment on pain intensity was statistically significant (F(1, 33) = 32.59, p = 0.00, η2 = 0.49). There was a significant main effect of the intervention (differences between measurements pre- and post-intervention) on the activation of the transverse abdominal muscle using the pressure biofeedback unit (F(1, 33) = 12.52, p = 0.001, η2 = 0.27). For the experimental group, the activation of the transverse abdominal muscle using the pressure biofeedback unit was significantly increased compared to that of the control group (MD 2.3; CI 95% 0.91 to 3.67; η2 = 0.25; p = 0.002), with a large effect size (Table 