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Reliability of a semi-automated algorithm for the vastus lateralis muscle architecture measurement based on ultrasound images

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Abstract

Purpose

The assessment of muscle architecture with B-mode ultrasound is an established method in muscle physiology and mechanics. There are several manual, semi-automated and automated approaches available for muscle architecture analysis from ultrasound images or videos. However, most approaches have limitations such as workload, subjectivity, drift or they are applicable to short muscle fascicles only. Addressing these issues, an algorithm was developed to analyse architectural parameters of the vastus lateralis muscle (VL).

Methods

In 17 healthy young men and women, ultrasound images were taken five times on two different days during passive knee joint flexion. From the images, fascicle length (FL), pennation angle (PAN) and muscle thickness (MTH) were calculated for both test days using the algorithm. Interday differences were determined using a two-way ANOVA. Interday and intraday reliability were assessed using intraclass correlation coefficients (ICC) and root mean square (RMS) differences.

Results

FL, MTH and PAN did not differ between day one and two. The within day ICCs were above 0.94 for all tested parameters. The average interday ICCs were 0.86 for the FL, 0.96 for MTH and 0.60 for PAN. The average RMS differences between both days were 5.0%, 8.5% and 12.0% for MTH, FL and PAN, respectively.

Conclusion

The proposed algorithm provides high measurement reliability. However, the interday reliability might be influenced by small differences in probe position between days.

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Abbreviations

ANOVA:

Analysis of variance

B-mode:

Brightness modulation (ultrasound)

FL:

Fascicle length

GM:

Gastrocnemius medialis

GUI:

Graphical user interface

ICC:

Intraclass correlation coefficient

MTH:

Muscle thickness

PAN:

Pennation angle

RMS:

Root mean square

ROI:

Region of interest

VL:

Vastus lateralis (muscle)

References

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Acknowledgements

The study was supported by the German Federal Institute of Sports Science BISp Germany (ZMVI1-070108/14-16).

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Authors

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Correspondence to Adamantios Arampatzis.

Additional information

Communicated by Olivier Seynnes.

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Cite this article

Marzilger, R., Legerlotz, K., Panteli, C. et al. Reliability of a semi-automated algorithm for the vastus lateralis muscle architecture measurement based on ultrasound images. Eur J Appl Physiol 118, 291–301 (2018). https://doi.org/10.1007/s00421-017-3769-8

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  • DOI: https://doi.org/10.1007/s00421-017-3769-8

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