4.5 Article

Predictive equation for assessing appendicular lean soft tissue mass using bioelectric impedance analysis in older adults: Effect of body fat distribution

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EXPERIMENTAL GERONTOLOGY
卷 150, 期 -, 页码 -

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.exger.2021.111393

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Skeletal muscle index; Body composition; BIA; Elderly; Sarcopenia

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In this study, researchers developed and cross-validated a BIA-based equation for estimating ALST, taking into account the impact of body fat distribution. The new formula showed better accuracy and no bias compared to previously published models, providing a practical means to quantify ALST in older adults.
Background: Low muscle mass is associated with sarcopenia and increased mortality. Muscle mass, especially that of the limbs, is commonly estimated by dual-energy X-ray absorptiometry (DXA) or bioimpedance analysis (BIA). However, BIA-based predictive equations for estimating lean appendicular soft tissue mass (ALST) do not take into account body fat distribution, an important factor influencing DXA and BIA measurements. Objectives: To develop and cross-validate a BIA-based equation for estimating ALST with DXA as criterion, and to compare our new formula to three previously published models. Methods: One-hundred eighty-four older adults (140 women and 44 men) (age 71.5 +/- 7.3 years, body mass index 27.9 +/- 5.3 kg/m2) were recruited. Participants were randomly split into validation (n = 118) and crossvalidation groups (n = 66). Bioelectrical resistance was obtained with a phase-sensitive 50 kHz BIA device. Results: A BIA-based model was developed for appendicular lean soft tissue mass [ALST (kg) = 5.982 + (0.188 x S2 / resistance) + (0.014 x waist circumference) + (0.046 x Wt) + (3.881 x sex) - (0.053 x age), where sex is 0 if female or 1 if male, Wt is weight (kg), and S is stature (cm) (R2 = 0.86, SEE = 1.35 kg)]. Cross validation revealed r2 of 0.91 and no mean bias. Two of three previously published models showed a trend to significantly overestimate ALST in our sample (p < 0.01). Conclusions: The new equation can be considered valid, with no observed bias and trend, thus affording practical means to quantify ALST mass in older adults.

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