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Objectives <p>To compare muscle thickness of rectus abdominis, internal oblique, external oblique, and transversus abdominis between rest and PFM isolated contraction.</p> Design <p>Cross-sectional reliability study.</p> Methods <p>Muscle thickness from rectus abdominis, internal oblique, external oblique and transversus abdominis was obtained from 27 physically active women (age: 26.41 ± 0.77&#xa0;years) with ultrasound imaging at rest and during three maximum PFM contractions. Two independent analyzers, blinded to the conditions, analyzed 3 images from each muscle and condition using Image-J 1.42q software. Muscle thickness was measured three times on each image. Differences between conditions (rest and PFM contraction) were analyzed with a Student t-test. To verify the outcome measures’ inter-analyzer reliability, the intraclass correlation coefficient (ICC), standard error of the measurement (SEM), and minimum detectable change (MDC) were calculated.</p> Results <p>TrA showed a significant increase in muscle thickness from rest compared to PFM isolated contraction (<i>p</i> &lt; 0.001; <i>t</i>:−4.137). However, muscle thickness was similar for the two conditions in rectus abdominis (<i>p</i> = 0.093; <i>t</i>:1.746), internal oblique (<i>p</i> = 0.410; <i>t</i>:0.838), and external oblique (<i>p</i> = 0.847; <i>t</i>:0.196). Excellent reliability was found for muscle thickness at rest (<i>r</i> = 0.828–1.000; <i>p</i> &lt; 0.001) and during PFM contraction (<i>r</i> = 0.997–1.000; <i>p</i> = 0.001) for rectus abdominis, internal oblique, external oblique and transversus abdominis muscles. SEM and MDC values from all outcomes were low.</p> Conclusion <p>PFM isolated contraction generates a significant contraction of the transversus abdominis muscle, which helps controlling intra-abdominal pressure. The excellent inter-analyzer reliability evidence that abdominal muscles’ muscle thickness is reliable when obtained by different analyzers.</p>

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Changes in abdominal muscles’ thickness from rest to pelvic floor isolated contraction in healthy women

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月16日

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  • Bruna Bohrer Mozzaquatro,
  • Francesca Chaida Sonda,
  • Fábio Juner Lanferdini,
  • Amanda Zanella de Mello,
  • Suzana Mallmann,
  • Andriéli Aparecida Salbego Lançanova,
  • Luciana Laureano Paiva,
  • Marco Aurélio Vaz,
  • José Geraldo Lopes Ramos

摘要

Objectives

To compare muscle thickness of rectus abdominis, internal oblique, external oblique, and transversus abdominis between rest and PFM isolated contraction.

Design

Cross-sectional reliability study.

Methods

Muscle thickness from rectus abdominis, internal oblique, external oblique and transversus abdominis was obtained from 27 physically active women (age: 26.41 ± 0.77 years) with ultrasound imaging at rest and during three maximum PFM contractions. Two independent analyzers, blinded to the conditions, analyzed 3 images from each muscle and condition using Image-J 1.42q software. Muscle thickness was measured three times on each image. Differences between conditions (rest and PFM contraction) were analyzed with a Student t-test. To verify the outcome measures’ inter-analyzer reliability, the intraclass correlation coefficient (ICC), standard error of the measurement (SEM), and minimum detectable change (MDC) were calculated.

Results

TrA showed a significant increase in muscle thickness from rest compared to PFM isolated contraction (p < 0.001; t:−4.137). However, muscle thickness was similar for the two conditions in rectus abdominis (p = 0.093; t:1.746), internal oblique (p = 0.410; t:0.838), and external oblique (p = 0.847; t:0.196). Excellent reliability was found for muscle thickness at rest (r = 0.828–1.000; p < 0.001) and during PFM contraction (r = 0.997–1.000; p = 0.001) for rectus abdominis, internal oblique, external oblique and transversus abdominis muscles. SEM and MDC values from all outcomes were low.

Conclusion

PFM isolated contraction generates a significant contraction of the transversus abdominis muscle, which helps controlling intra-abdominal pressure. The excellent inter-analyzer reliability evidence that abdominal muscles’ muscle thickness is reliable when obtained by different analyzers.