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European Journal of Applied Physiology

, Volume 117, Issue 10, pp 2001–2007 | Cite as

Increase in echo intensity and extracellular-to-intracellular water ratio is independently associated with muscle weakness in elderly women

  • Masashi TaniguchiEmail author
  • Yosuke Yamada
  • Yoshihiro Fukumoto
  • Shinichiro Sawano
  • Seigo Minami
  • Tome Ikezoe
  • Yuya Watanabe
  • Misaka Kimura
  • Noriaki Ichihashi
Original Article

Abstract

Purpose

The changes in muscle composition and its heterogeneity during aging are associated with muscle weakness in elderly persons independent of decreases in muscle mass or muscle thickness (MT). Both the assessment of echo intensity (EI) with ultrasound imaging and the evaluation of the extracellular water/intracellular water (ECW/ICW) ratio with segmental bioelectrical impedance spectroscopy (BIS) are non-invasive and convenient methods and seem valuable for muscle quality determination. However, no previous study has evaluated both EI and the ECW/ICW ratio simultaneously to investigate their relationship to muscle strength. The purpose of the present study was to investigate whether both EI and the ECW/ICW ratio are independently associated with muscle strength in elderly women.

Methods

A total of 179 elderly women with a mean age of 74.1 ± 4.9 years, living independently in the community, were enrolled. The MT and EI of the quadriceps femoris were measured using transverse ultrasound imaging. The ECW/ICW ratio in the upper thigh was calculated from segmental BIS. The maximum knee extensor strength and the presence of knee pain were also assessed.

Results

Knee extensor strength showed a significant positive correlation with MT, and significant negative correlations with EI, the ECW/ICW ratio, and age. Stepwise regression analysis revealed that knee extensor strength in elderly women was predicted by MT, EI, and the ECW/ICW ratio.

Conclusions

This study suggests that the simultaneous application of EI and the ECW/ICW ratio is useful in assessing muscle strength, and accurately estimates the changes in muscle quality related to muscle weakness.

Keywords

Muscle strength Muscle quality Echo intensity Extracellular water Muscle thickness 

Abbreviations

BIS

Bioelectrical impedance spectroscopy

BMI

Body mass index

ECW

Extracellular water

EI

Echo intensity

ICW

Intracellular water

MT

Muscle thickness

RF

Rectus femoris

VI

Vastus intermedius

Notes

Acknowledgements

The authors would like to thank Nishimura T, Watanabe A, Kaihara C, Iwane K, and Shoji Y for their practical and technical assistance. The authors also thank all individuals who participated in the study. This study was not funded by any institutions, agencies, or companies.

Compliance with ethical standards

Conflict of interest

The authors have no conflicts of interest to disclose.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Masashi Taniguchi
    • 1
    • 2
    Email author
  • Yosuke Yamada
    • 3
  • Yoshihiro Fukumoto
    • 4
  • Shinichiro Sawano
    • 1
  • Seigo Minami
    • 5
  • Tome Ikezoe
    • 2
  • Yuya Watanabe
    • 6
  • Misaka Kimura
    • 7
  • Noriaki Ichihashi
    • 2
  1. 1.Division of Physical Therapy, Rehabilitation UnitsShiga University of Medical Science HospitalOtsuJapan
  2. 2.Human Health Sciences, Graduate School of MedicineKyoto UniversityKyotoJapan
  3. 3.Department of Nutritional and Metabolism, National Institute of Health and NutritionNational Institutes of Biomedical Innovation, Health and NutritionTokyoJapan
  4. 4.Faculty of RehabilitationKobe Gakuin UniversityKobeJapan
  5. 5.Department of Occupational Therapy, Faculty of Allied Health SciencesYamato UniversitySuitaJapan
  6. 6.Faculty of Health and Sports ScienceDoshisha UniversityKyotanabeJapan
  7. 7.Department of Health and Sports SciencesKyoto Gakuen UniversityKameokaJapan

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