Computed Tomography-Derived Skeletal Muscle Radiodensity Predicts Peak Weight-Corrected Jump Power in Older Adults: The Korean Urban Rural Elderly (KURE) Study

Heewon Choi, Namki Hong, Narae Park, Chang Oh Kim, Hyeon Chang Kim, Jin Young Choi, Yoosik Youm, Yumie Rhee

Research output: Contribution to journalArticlepeer-review

Abstract

Computed tomography (CT)-derived skeletal muscle area (SMA) and skeletal muscle radiodensity (SMD) reflect distinctive quantitative and qualitative characteristics of skeletal muscles. However, data on whether CT-based muscle parameters, especially SMD, can predict muscle function is limited. In a prospective cohort, 1523 community-dwelling older adults who underwent abdominal CT scans and the countermovement two-legged jumping test on a ground reaction force platform were analyzed (mean age 74.7 years, 65.1% women). SMA and SMD were measured at third lumbar vertebra level (L3). Individuals with low jump power (peak weight-corrected jump power < 23.8 W/kg in men and < 19.0 W/kg in women using clinically validated threshold) were older; had lower SMA, SMD, and maximal grip strength values; and had lower chair rise test and timed up and go test performance than those without low jump power. SMD was positively associated with peak weight-corrected jump power (adjusted β = 0.33 and 0.23 per 1 HU increase in men and women, respectively, p < 0.001). One HU decrement in SMD was associated with 10% elevated odds of low jump power (adjusted OR [aOR] 1.10, p < 0.001) after adjusting for age, sex, height, inflammation, and insulin resistance markers, whereas the association of SMA with low jump power was attenuated (aOR 1.00, p = 0.721). SMD showed better discrimination for low jump power than SMA (AUC 0.699 vs. 0.617, p < 0.001), with additional improvement when added to SMA and conventional risk factors (AUC 0.745 to 0.773, p < 0.001). Therefore, CT-measured L3 SMD can be a sensitive surrogate marker for muscle function along with SMA in older adults, which merits further investigation.

Original languageEnglish
Pages (from-to)764-774
Number of pages11
JournalCalcified Tissue International
Volume108
Issue number6
DOIs
Publication statusPublished - 2021 Jun

Bibliographical note

Funding Information:
This research was funded by the Korea Centers for Disease Control and Prevention (2013-E63007-01, 2013-E63007-02, 2019-ER6302-01), and Internal Medicine.

Funding Information:
We thank Sung-Kil Lim Research Award (4-2018-1215) and 2020 Research fund of Department of Internal Medicine, Severance Hospital, Seoul, Korea for the data quality assurance and statistical assistance by the SENTINEL (Severance ENdocrinology daTa scIeNcE pLatform) team.

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Orthopedics and Sports Medicine
  • Endocrinology

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