Waist Circumference, a Clinical Measurement for the Activity of Transversus Abdominis

Improving the timing and endurance of the deep abdominal muscles, notably transversus abdominis (TrA), is a known protocol for improving spinal stability. TrA is the deepest abdominal muscle, and monitoring its activity is a difficult task. Ultrasound and pressure biofeedback have been employed for monitoring the activity of TrA; however, these methods are expensive, not always available in all clinical settings, and their application requires formal training. The purpose of this study was to examine the use of a broadly known method, i.e., changes in the waist circumference, to monitor the activity of TrA. 

The study was carried out on 14 subjects following a pilot study of 5 participants. The thickness of TrA measured by ultrasound was considered the standard indicator for activity of TrA and was compared with simu

Improving the timing and endurance of the deep abdominal muscles, notably transversus abdominis (TrA), is a known protocol for improving spinal stability. TrA is the deepest abdominal muscle, and monitoring its activity is a difficult task. Ultrasound and pressure biofeedback have been employed for monitoring the activity of TrA; however, these methods are expensive, not always available in all clinical settings, and their application requires formal training. The purpose of this study was to examine the use of a broadly known method, i.e., changes in the waist circumference, to monitor the activity of TrA. 

The study was carried out on 14 subjects following a pilot study of 5 participants. The thickness of TrA measured by ultrasound was considered the standard indicator for activity of TrA and was compared with simultaneous measurement of waist circumference. 

A significant criterion validity between the thickness of TrA and the waist circumference was established (Pearson correlation=-0.71, P=0.001), indicating an inverse relationship between changes in the thickness of the transversus abdominis muscle and waist circumference.

This result confirmed the hypothesis that changes in the waist circumference could be employed as a suitable indicator for the activity of TrA.ltaneous measurement of waist circumference. 

A significant criterion validity between the thickness of TrA and the waist circumference was established (Pearson correlation=-0.71, P=0.001), indicating an inverse relationship between changes in the thickness of the transversus abdominis muscle and waist circumference.

This result confirmed the hypothesis that changes in the waist circumference could be employed as a suitable indicator for the activity of TrA.