Discussion
L3-L4 lumbar spine height, sarcopenia, lean mass
DISEASE, SARCOPENIA
In the present study, the WBI correlated highly with the CSA of the psoas major at L3-L4 lumbar spine height. This key finding supports our hypothesis that the WBI from bioimpedance measurements can be used as an estimated variable for estimating the PMM of older adults at L3-L4 lumbar spine height.Several imaging methods use a single scan from the 4th to 5th lumbar vertebrae (L4-L5) to determine the distribution of lumbar muscles and measurement of the psoas major [Englesbe Using ultrasound to measure the CSA of the psoas major and its derived indexes can be applied to evaluate the physiological status and disease severity of sarcopenia patients [Ishiguro This study was a preliminary study conducted to explore the model establishment and feasibility of BIA in PMM measurement. To evaluate the ability of BIA to measure body composition, the pilot study usually starts from a single frequency. The simplicity of using a single frequency makes it easy to focus on bioimpedance and to explore the relationship between the response variables. Compared with single-frequency BIA measurement, multi-frequency BIA can be shown to provide more reliable results than single-frequency BIA for soft tissue lean mass [Daytime impedance changes in whole-body or hand-to-foot modes are small relative to changes in arm and leg segment impedance measurements. If using segment impedance measurements to estimate body fat percentage, body water content, or the PMM of body composition, it is especially necessary to measure impedance values at regularly scheduled times [The present equation is a surrogate method using BIA to indirectly estimate PMM for future clinical purposes (e.g., sarcopenia). A close relationship is noted between the BIA method and the ratio of Drills and Contini [