• Hiroshi Ishida, Tadanobu Suehiro, Chiharu Kurozumi, Koji Ono, and Susumu Watanabe.
• Department of Rehabilitation (H.I., T.S., C.K., S.W.) and Master's Program in Rehabilitation (K.O.), Kawasaki University of Medical Welfare, Kurashiki, Okayama, Japan ishida@mw.kawasaki-m.ac.jp.
• J Ultrasound Med. 2015 Nov 1; 34 (11): 2001-5.

ObjectivesThe activity of abdominal muscles mainly produces high expiratory pressure. These include the rectus abdominis, external oblique, internal oblique, and transverse abdominis muscles. The purpose of this study was to determine whether maximal expiratory pressure is associated with each abdominal muscle thickness at rest.MethodsThirty-nine healthy male volunteers (mean age ± SD, 20.7 ± 2.7 years) participated in the study. The thickness of the right rectus abdominis, external oblique, internal oblique, and transverse abdominis muscles was measured by B-mode sonography in the supine position. The maximal expiratory pressure was obtained with a spirometer in the sitting position. The correlations between each abdominal muscle thickness and maximal expiratory pressure were determined by the Pearson correlation coefficient.ResultsThe correlation coefficient between the rectus abdominis muscle and maximal expiratory pressure was 0.571 (P< .001). Correlation coefficients between the external oblique, internal oblique, and transverse abdominis muscles and maximal expiratory pressure were 0.297 (P = .066), 0.267 (P = .100), and 0.022 (P = .894), respectively.ConclusionsOur results indicate that the rectus abdominis muscle thickness might be more highly correlated with expiratory pressure production than the external oblique, internal oblique, and transverse abdominis muscle thickness.© 2015 by the American Institute of Ultrasound in Medicine.

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