Author Identifier
Marc Sim: https://orcid.org/0000-0001-5166-0605
Document Type
Journal Article
Publication Title
The journals of gerontology. Series A, Biological sciences and medical sciences
Volume
80
Issue
1
PubMed ID
39538979
Publisher
Oxford Academic
School
Nutrition and Health Innovation Research Institute / School of Medical and Health Sciences
RAS ID
72718
Funders
Claude D. Pepper Older American Independence Centers (P30AG067988) / Royal Perth Hospital Research Foundation / Future Health Research and Innovation Fund
Abstract
BACKGROUND: Biomarkers for sarcopenia are lacking. We examined the diagnostic power of serum creatinine to cystatin C ratio for identifying low magnetic resonance imaging-muscle volume and low grip strength in a large observational study of UK Biobank older adults. METHODS: Serum creatinine and cystatin C were measured via immunoassays (Beckman Coulter AU5800 and Siemens Advia 1800, respectively) and grip strength by hydraulic hand dynamometer at baseline visit (2008-2010). magnetic resonance imaging-thigh fat-free muscle volume and DXA-derived appendicular lean mass were measured at imaging visit (2014-2018). Extreme outliers were removed, and covariates (demographic, lifestyle, and clinical factors, as well as time elapsed between baseline-imaging visit) were adjusted for in statistical models. RESULTS: 12 873 older adults (mean age: 63.5 ± 2.7 years, 44.2% women) were included for fat-free muscle volume and appendicular lean mass/body mass index; 149 707 older adults (mean age: 64.0 ± 2.9 years, 50.5% women) for grip strength. Despite significant associations (p < .05), in fully adjusted models, creatinine to cystatin C showed poor to acceptable diagnostic power for identifying low fat-free muscle volume when using cutpoints of 20th percentile (area under the curve: 0.577 men; 0.622 women) and T scores of -2 (area under the curve: 0.596 men; 0.659 women) and -2.5 (area under the curve: 0.609 men; 0.722 women). In fully adjusted model, creatinine to cystatin C showed poor diagnostic power (area under the curves: < 0.70) for identifying low appendicular lean mass/body mass index or low grip strength, irrespective of the cutpoint used. CONCLUSIONS: Creatinine to cystatin C may not be a suitable biomarker for identifying low muscle volume or low strength in older adults. This finding, drawn from a large sample size and the use of advanced medical imaging, marks an important contribution to the sarcopenia field.
DOI
10.1093/gerona/glae274
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License
Comments
Kirk, B., Kuo, C. L., Liu, P., Xiang, M., Zanker, J., Prokopidis, K., ... & Duque, G. (2025). Diagnostic power of serum creatinine/cystatin C ratio for identifying low MRI-muscle volume and low grip strength: Data From 9 731 to 149 707 UK Biobank Older Adults. The Journals of Gerontology, Series A: Biological Sciences and Medical Sciences, 80(1). https://doi.org/10.1093/gerona/glae274