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Estimating thigh skeletal muscle volume using multi-frequency segmental-bioelectrical impedance analysis.

Masashi Taniguchi1, Yosuke Yamada2, Masahide Yagi3

  • 1Human Health Sciences, Graduate School of Medicine, Kyoto University, 53, Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan. taniguchi.masashi.7a@kyoto-u.ac.jp.

Journal of Physiological Anthropology
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PubMed
Summary

Combining bioimpedance analysis (BIA) with extracellular water/intracellular water (ECW/ICW) index and phase angle improves skeletal muscle volume (SMV) estimation accuracy. Segmental-BIA offers a cost-effective alternative to MRI for SMV assessment.

Keywords:
Estimation equationQuadricepsSegmental-bioimpedance analysisSkeletal muscle volumeThigh

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Area of Science:

  • Body composition analysis
  • Biomedical engineering
  • Imaging techniques

Background:

  • Accurate skeletal muscle volume (SMV) estimation is crucial for assessing health and disease.
  • Traditional methods like MRI are costly and time-consuming.
  • Exploring advanced bioimpedance analysis (BIA) techniques can offer more accessible alternatives.

Purpose of the Study:

  • To determine if combining the extracellular water/intracellular water (ECW/ICW) index and phase angle with segmental-BIA improves SMV estimation model fitting.
  • To compare the accuracy of segmental-BIA with ultrasound for estimating quadriceps SMV against MRI reference standards.

Main Methods:

  • Seventeen young men underwent MRI for thigh muscle imaging.
  • Segmental-BIA was used to collect data on 50-kHz bioelectrical impedance (BI) index, ICW index, ECW/ICW index, and phase angle.
  • Quadriceps SMV was calculated using MRI, and model fitting was assessed using standard error of estimate (%SEE).

Main Results:

  • The combination of 50-kHz BI with the ECW/ICW index or phase angle significantly improved thigh SMV estimation model fitting (SEE = 7.9% and 8.1%).
  • The intracellular water (ICW) index alone provided the best model fitting (SEE = 7.6%).
  • Segmental-BIA showed comparable accuracy to ultrasound for quadriceps SMV estimation.

Conclusions:

  • Integrating ECW/ICW index and phase angle with 50-kHz BI enhances SMV estimation model fitting compared to simple regression.
  • Segmental-BIA demonstrates equivalent model suitability to ultrasound for SMV estimation.
  • Segmental-BIA presents a viable, cost-effective alternative to MRI for SMV assessment.