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Related Articles Transversus abdominis: Changes in thickness during an incremental upper limb exercise test.
Physiother Theory Pract. 2008 Jul-Aug;24(4):265-73
Authors: McEvoy MP, Cowling AJ, Fulton IJ, Williams MT

The aim of this study was to measure transversus abdominis (TrA) during an incremental fatiguing task. Using real-time ultrasound, TrA thickness was measured in 26 healthy subjects (18-25 years, 9 male) during an unsupported upper limb exercise test (UULEX). Repeatability of changes in TrA thickness during the UULEX was established by using a test-retest process (n=9, intraclass correlation coefficient=0.62 (95% CI 0.38-0.82), standard error of measurement approximately 1 (95% CI 0.87-1.08)). Using mixed model analysis with time as an independent variable, TrA thickness changed significantly throughout the UULEX (p < 0.05). Measures of TrA thickness at minutes 10, 11, and 12 were significantly greater than at baseline (p=0.006 (95% CI 0.23-1.35), 0.001 (95% CI 0.45-1.61), and