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Echo intensity reliability between two rectus femoris probe sites.

Rodrigo Rabello1, Matias Fröhlich1, Aline Felicio Bueno1

  • 1Escola de Educação Física, Fisioterapia e Dança Laboratório de Pesquisa do Exercício, Universidade Federal do Rio Grande do Sul, Brazil.

Ultrasound (Leeds, England)
|November 26, 2019
PubMed
Summary

Ultrasound echo intensity measurements of the rectus femoris muscle demonstrate high reliability across different days, raters, and analysts. However, echo intensity varies between muscle sites, indicating non-homogeneous muscle structure.

Keywords:
Intra-ratergrayscale analysisinter-analystinter-raterreproducibility

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Area of Science:

  • Biomedical Engineering
  • Musculoskeletal Ultrasound
  • Muscle Physiology

Background:

  • Ultrasound echo intensity is used to assess muscle quality, damage, and neuromuscular disorders.
  • Reliability of ultrasound measurements across different days, raters, analysts, and muscle sites is not well-established.
  • This study investigates the reliability of ultrasound measurements at two distinct sites of the rectus femoris muscle.

Purpose of the Study:

  • To compare intra-rater, inter-rater, and inter-analyst reliability of ultrasound echo intensity measurements.
  • To evaluate reliability at two different sites (RF50 and RF70) of the rectus femoris muscle.
  • To determine if muscle site affects the reliability of ultrasound measurements.

Main Methods:

  • Ultrasound images were acquired from 32 healthy subjects at 50% (RF50) and 70% (RF70) of thigh length.
  • Muscle echo intensity was quantified from these ultrasound images.
  • Intra-rater, inter-rater, and inter-analyst reliability were assessed using intraclass correlation coefficients (ICC).

Main Results:

  • Echo intensity values were significantly higher at RF50 compared to RF70 (p=0.0001).
  • High reliability was observed for all comparisons: intra-rater (ICC=0.89-0.94), inter-rater (ICC=0.89), and inter-analyst (ICC=0.98-0.99).
  • Significant differences (p<0.05) were found between raters and analysts for echo intensity values at both rectus femoris sites.

Conclusions:

  • The rectus femoris muscle is not structurally homogeneous, as indicated by differing echo intensity values between measurement sites.
  • Ultrasound echo intensity measurements of the rectus femoris muscle exhibit high reliability, supporting consistent use by experienced raters and analysts.
  • Measurements from different muscle regions should not be used interchangeably due to structural variations.