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Postpartum characteristics of rectus abdominis on ultrasound imaging

Coldron, Y., Stokes, M.J., Newham, D.J. and Cook, K. (2007) Postpartum characteristics of rectus abdominis on ultrasound imaging Manual Therapy, pp. 1-10. (doi:10.1016/j.math.2006.10.001).

Record type: Article


This cross-sectional and partial longitudinal study aimed to characterize changes in rectus abdominis (RA) and provide reference ranges for the first year postpartum. Ultrasound scanning was used at four stages postnatally to measure cross-sectional area (CSA), thickness, width (indirectly using a shape value) and inter-recti distance (IRD). One hundred and fifteen postnatal women (though some postnatal subjects appeared in more than one postnatal group thus giving a total of 183 data points) and 69 age-matched nulliparous female controls were recruited. Postnatal subjects were studied at Day 1 (PN1; n=63) and at 2 (PN2; n=55), 6 (PN3; n=39) and 12 (PN4; n=26) months postpartum. Longitudinal data were analysed for CSA, thickness, shape (indirect width measurement) (df=67) and IRD (df=62). The mean CSA of the PN1 group was significantly larger (P<0.001) than in controls and decreased (P<0.0021) by 12 months. In all postnatal groups, RA was significantly thinner (P<0.0001, PN1–PN3; P<0.0478, PN4), wider (P<0.0001, PN1–PN3; P=0.0326, PN4) and the IRD was significantly larger (P<0.0001, PN1–PN4) than in controls. Over 2 months postpartum, RA became thicker (P=0.0003) and the width and IRD decreased (P<0.0001 and P=0.0002, respectively) but did not return to control values by 12 months. These results have implications for strength of RA postpartum and anterior abdominal wall stiffness, which together with other muscle characteristics could inform development of effective postnatal exercise programmes.

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Submitted date: 7 November 2005
Published date: 5 January 2007
Keywords: rectus abdominis, postpartum, ultrasound scanning, muscle characteristics


Local EPrints ID: 46614
ISSN: 1356-689X
PURE UUID: a7286923-a5bd-4ccd-b48b-53676b50747f
ORCID for M.J. Stokes: ORCID iD

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Date deposited: 06 Jul 2007
Last modified: 17 Jul 2017 15:06

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Author: Y. Coldron
Author: M.J. Stokes ORCID iD
Author: D.J. Newham
Author: K. Cook

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