Mixed
Multi-frequency bioelectrical impedance analysis (MF-BIA) using an age-independent equation (incorporating impedance ratios and 1/Z50) accurately estimates appendicular skeletal muscle mass (ALM) comparable to DXA, whereas traditional age-dependent BIA equations significantly underestimate ALM in younger adults.
If you are tracking muscle mass changes, especially if you are young or comparing yourself to older data, standard consumer BIA scales may be misleading because they often use age-dependent formulas that underestimate muscle in younger people. For accurate research or clinical assessment, use a validated, age-independent MF-BIA equation or DXA. For general fitness, focus on strength and performance metrics rather than the absolute number from a consumer scale.
The residual was significantly correlated with age, which indicated that the previous BIA equation underestimated ALM in young adults. The previous equation cannot be used to examine age-related ALM loss.
Why this rating
Large sample size (n=756 for development, n=233 for validation, n=2992 for cutoffs), rigorous statistical validation (R2 > 0.85), and comparison against gold-standard DXA.
Source
Developing and Validating an Age-Independent Equation Using Multi-Frequency Bioelectrical Impedance Analysis for Estimation of Appendicular Skeletal Muscle Mass and Establishing a Cutoff for Sarcopenia
Yosuke Yamada et al. · International Journal of Environmental Research and Public Health · 2017
DOI 10.3390/ijerph14070809
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