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Changes in mechanical properties at the muscle level could be detected by Nakagami imaging during in-vivo fixed-end contractions

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  • Andrea Monte
  • Po-Hsian Tsui
  • Paola Zamparo

Abstract

In this study, we investigated the capability of the Nakagami transformation to detect changes in vastus lateralis muscle-tendon stiffness (k) during dynamic (and intense) contractions. k was evaluated in eleven healthy males using the gold-standard method (a combination of ultrasound and dynamometric measurements) during maximal and sub-maximal voluntary fixed-end contractions of the knee extensors (20, 40, 60, 80, and 100% of maximum voluntary force), while Nakagami parameters were analysed using the Nakagami transformation during the same contractions. Muscle-belly behaviour was investigated by means of B-mode ultrasound analysis, while Nakagami parameters were obtained in post-processing using radiofrequency data. k was calculated as the slope of the force-muscle-belly elongation relationship. Three contractions at each intensity were performed to calculate the intra-trial reliability and the coefficient of variation (CV) of the Nakagami parameters. At all contraction intensities, high values of intra-trial reliability (range: 0.92–0.96) and low CV (

Suggested Citation

  • Andrea Monte & Po-Hsian Tsui & Paola Zamparo, 2024. "Changes in mechanical properties at the muscle level could be detected by Nakagami imaging during in-vivo fixed-end contractions," PLOS ONE, Public Library of Science, vol. 19(9), pages 1-13, September.
    • Handle: RePEc:plo:pone00:0308177
    DOI: 10.1371/journal.pone.0308177
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