What is Muscle Age?
Muscle age is a biological indicator that reflects your muscle health status based on CT-measured skeletal muscle area at the L3 lumbar vertebra level. Using reference data from 11,845 healthy Korean adults, our AI system calculates your muscle age by comparing your muscle mass to age-specific standards.
To calculate your muscle age, you must first use our Sarcopenia Analysis Service to obtain your CT-based body composition analysis results.
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Reference Study: Korean Population Data
Kim et al. (2021) established reference values and T-scores for skeletal muscle area (SMA) measured by CT scan in 11,845 healthy Korean adults (7,314 men, 4,531 women).
The study measured SMA at the L3 lumbar vertebra level using standardized thresholds (-29 to +150 Hounsfield units) and calculated various skeletal muscle indices adjusted for height, weight, and BMI.
Key Finding: BMI-adjusted index (SMA/BMI) was identified as the best metric to reflect age-related muscle changes and maximize diagnostic accuracy for sarcopenia.
Reference: Kim EH, Kim KW, Shin Y, Lee J, Ko Y, Kim YJ, Lee MJ, Bae SJ, Park SW, Choe J, Kim HK. "Reference Data and T-Scores of Lumbar Skeletal Muscle Area and Its Skeletal Muscle Indices Measured by CT Scan in a Healthy Korean Population." The Journals of Gerontology: Series A, Volume 76, Issue 2, February 2021, Pages 265–271.
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