Original Article
J Frailty Sarcopenia Falls 2025 Mar; 10(1):1-7 Copied!
10.22540/JFSF-10-001 Copied!
Development of Estimate Formulas for Appendicular Lean Mass Using Forearm Circumference in Older Adults Requiring Care
- Department of Shizuoka Physical Therapy, Faculty of Health Science, Tokoha University, Japan
- Long-Term Care Health Facilities Sunrise Ohama, Japan
- Graduate School, Hamamatsu University School of Medicine, Cooperative Major in Medical Photonics (Doctoral Course), Japan
Keywords:
Abstract Objectives The use of forearm circumference (FC) in the estimation equation to predict appendicular lean mass (ALM) in older adults who require care remains unclear. Methods This cross-sectional study targeted 132 participants aged ≥65 years requiring care. The ALM was measured with bioelectrical impedance analysis (BIA). Handgrip strength (HS) was measured with a digital hand dynamometer. FC was measured at the site of maximum swelling using a tape measure. Multiple regression analysis was conducted to develop an equation for estimating BIA-measured ALM using FC. Moreover, we investigated a systematic error by Bland–Altman analysis between BIA-measured ALM and ALM calculated by the estimation equation. Results We developed the four estimation equations. The values of r, adjusted R2, and SEE in the representative model (FC + HS + age) were 0.86, 0.73, and 2.01 (kg), respectively (p<0.05). In contrast, a systematic error was identified between the BIA-measured ALM and ALM calculated by the estimation equations by the Bland–Altman analysis. Conclusions This study developed the formula using FC, which can predict ALM with less influence of edema, but it may over- or underestimate ALM in older adults requiring care