• S M Bunce, A P Moore, and A D Hough.
• Clinical Research Centre for Health Professions, Aldro Building, 49 Darley Road, Eastbourne BN20 7UR, UK. s.bunce@bton.ac.uk
• Clin Biomech (Bristol, Avon). 2002 May 1; 17 (4): 315-7.

ObjectiveThe purpose of this study was to establish a reliable method for measuring transversus abdominis thickness in asymptomatic human subjects in supine lying, standing and walking.Design And MethodsThis was a single operator reliability study using ultrasound imaging to measure 22 subjects on three separate occasions. A purpose built high-density foam reinforced belt was used to house and position the transducer over the mid-point of the transversus abdominis. Each subject was imaged in supine, standing, and treadmill walking at 3 kph. Intraclass correlation coefficients and standard error of measurement analysis were used to measure the data.ResultsThe correlation coefficient data analysis resulted in intraclass correlation coefficients of 0.94 (standard error of measurement 0.35) in supine lying, 0.88 (0.66) in standing and 0.88 (0.56) in walking.ConclusionThe method described is a reliable tool for measuring changes in thickness of transversus abdominis in supine lying, standing and walking.RelevanceThis procedure has the potential to detect dysfunctional changes in abdominal muscle activity for patients with low back pain in a functional setting.

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