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Advanced quantitative methods in correlating sarcopenic muscle degeneration with lower extremity function biometrics and comorbidities

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  • Kyle Edmunds
  • Magnús Gíslason
  • Sigurður Sigurðsson
  • Vilmundur Guðnason
  • Tamara Harris
  • Ugo Carraro
  • Paolo Gargiulo

Abstract

Sarcopenic muscular degeneration has been consistently identified as an independent risk factor for mortality in aging populations. Recent investigations have realized the quantitative potential of computed tomography (CT) image analysis to describe skeletal muscle volume and composition; however, the optimum approach to assessing these data remains debated. Current literature reports average Hounsfield unit (HU) values and/or segmented soft tissue cross-sectional areas to investigate muscle quality. However, standardized methods for CT analyses and their utility as a comorbidity index remain undefined, and no existing studies compare these methods to the assessment of entire radiodensitometric distributions. The primary aim of this study was to present a comparison of nonlinear trimodal regression analysis (NTRA) parameters of entire radiodensitometric muscle distributions against extant CT metrics and their correlation with lower extremity function (LEF) biometrics (normal/fast gait speed, timed up-and-go, and isometric leg strength) and biochemical and nutritional parameters, such as total solubilized cholesterol (SCHOL) and body mass index (BMI). Data were obtained from 3,162 subjects, aged 66–96 years, from the population-based AGES-Reykjavik Study. 1-D k-means clustering was employed to discretize each biometric and comorbidity dataset into twelve subpopulations, in accordance with Sturges’ Formula for Class Selection. Dataset linear regressions were performed against eleven NTRA distribution parameters and standard CT analyses (fat/muscle cross-sectional area and average HU value). Parameters from NTRA and CT standards were analogously assembled by age and sex. Analysis of specific NTRA parameters with standard CT results showed linear correlation coefficients greater than 0.85, but multiple regression analysis of correlative NTRA parameters yielded a correlation coefficient of 0.99 (P

Suggested Citation

  • Kyle Edmunds & Magnús Gíslason & Sigurður Sigurðsson & Vilmundur Guðnason & Tamara Harris & Ugo Carraro & Paolo Gargiulo, 2018. "Advanced quantitative methods in correlating sarcopenic muscle degeneration with lower extremity function biometrics and comorbidities," PLOS ONE, Public Library of Science, vol. 13(3), pages 1-16, March.
    • Handle: RePEc:plo:pone00:0193241
    DOI: 10.1371/journal.pone.0193241
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    Cited by:

    1. Filipe Rodrigues & Christophe Domingos & Diogo Monteiro & Pedro Morouço, 2022. "A Review on Aging, Sarcopenia, Falls, and Resistance Training in Community-Dwelling Older Adults," IJERPH, MDPI, vol. 19(2), pages 1-11, January.
    2. Özkan Güler & Dicle Aras & Fırat Akça & Antonino Bianco & Gioacchino Lavanco & Antonio Paoli & Fatma Neşe Şahin, 2020. "Effects of Aerobic and Anaerobic Fatigue Exercises on Postural Control and Recovery Time in Female Soccer Players," IJERPH, MDPI, vol. 17(17), pages 1-11, August.

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