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Related Experiment Video

Updated: Oct 24, 2025

In vivo Measurement of Knee Extensor Muscle Function in Mice
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In vivo Measurement of Knee Extensor Muscle Function in Mice

Published on: March 4, 2021

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Reliability of knee extensor neuromuscular structure and function and functional tests' performance.

Fábio J Lanferdini1, Francesca C Sonda2, Isabel A Paz2

  • 1Laboratory of Biomechanics, Center of Sports, Federal University of Santa Catarina - Florianópolis, Santa Catarina, Brazil.

Journal of Bodywork and Movement Therapies
|August 15, 2021
PubMed
Summary

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This study found high reliability for neuromuscular and functional tests in healthy subjects, suggesting their clinical utility. Muscle architecture measures may require further rater training for consistent results.

Area of Science:

  • Neuromuscular physiology
  • Biomechanics
  • Clinical assessment

Background:

  • Evaluating the reliability of neuromuscular and functional tests is crucial for accurate clinical assessments.
  • Standardized protocols ensure consistent and reproducible measurements in research and practice.

Purpose of the Study:

  • To assess the intra-rater, inter-rater, and inter-analyzer reliability of key neuromuscular variables and functional tests.
  • To determine the clinical applicability of these measurements based on their reliability.

Main Methods:

  • A cross-sectional crossover design was employed with twenty-two healthy participants.
  • Measurements included knee-extensor strength, muscle activation (vastus lateralis, rectus femoris, vastus medialis), muscle architecture (fascicle length, pennation angle, muscle thickness) via ultrasound, five sit-to-stand (STS) test time, and 6-minute walk test (6MWT) distance.
Keywords:
Healthy subjectsInter-analyzerInter-raterIntra-raterReliability

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  • Intraclass correlation coefficients (ICC) were calculated and categorized as strong, moderate, or weak.

    • Main Results:

    • Strong intra-rater reliability (ICC ≥ 0.75) was observed for most variables, including strength, muscle activation, muscle architecture (VL fascicle length, pennation angle, muscle thickness; RF muscle thickness), STS, and 6MWT.
    • Strong inter-rater reliability was also found for strength, muscle activation, VL pennation angle and muscle thickness, RF muscle thickness, STS, and 6MWT.
    • Moderate reliability was noted for VL fascicle length in inter-rater assessments, while inter-analyzer reliability for muscle architecture was generally strong.

    Conclusions:

    • High intra- and inter-rater and inter-analyzer reliability for most tested variables support their use in clinical evaluations.
    • Muscle architecture measurements may benefit from extended rater and analyzer training to enhance reliability.
    • The findings provide evidence for the consistent application of these neuromuscular and functional assessments in clinical settings.