biostudies-literatureUnknown25(8)Neira Alvarez M<h4>Background</h4>Different methods have been proposed to study skeletal muscle mass in sarcopenia diagnosis, although all have inherent drawbacks. The aim of this study was to evaluate the utility of muscle ultrasound in muscle assessment by studying its correlation with dual-energy x-ray absorptiometry (DXA) and calf circumference (CC), cut-off values for ultrasound-based detection of low muscle mass, and the correlation with muscle performance.<h4>Methods</h4>Fifty-seven participants older than 70 years, underwent a muscle ultrasound study, DXA, calf circumference (CC) and functional assessment. Ultrasound measurements were taken in the femoral quadriceps (transverse plane) and in the medial gastrocnemius (transverse and longitudinal planes). Muscle function was assessed by gait speed,The journal of nutrition, health & aging956-963https://www.ebi.ac.uk/biostudies/studies/S-EPMC12929985biostudies-literatureMuscle Assessment by Ultrasonography: Agreement with Dual-Energy X-Ray Absorptiometry (DXA) and Relationship with Physical Performance.PMC12929985Andreu-Vazquez CMartinez Martin PVazquez Ronda MAThuissard-Vasallo IJRabago Lorite INeira Alvarez MSerralta San Martin GSoler Rangel LfalseMuscle Assessment by Ultrasonography: Agreement with Dual-Energy X-Ray Absorptiometry (DXA) and Relationship with Physical Performance.<h4>Background</h4>Different methods have been proposed to study skeletal muscle mass in sarcopenia diagnosis, although all have inherent drawbacks. The aim of this study was to evaluate the utility of muscle ultrasound in muscle assessment by studying its correlation with dual-energy x-ray absorptiometry (DXA) and calf circumference (CC), cut-off values for ultrasound-based detection of low muscle mass, and the correlation with muscle performance.<h4>Methods</h4>Fifty-seven participants older than 70 years, underwent a muscle ultrasound study, DXA, calf circumference (CC) and functional assessment. Ultrasound measurements were taken in the femoral quadriceps (transverse plane) and in the medial gastrocnemius (transverse and longitudinal planes). Muscle function was assessed by gait speed,2021-01-01T00:00:00Z20212026-07-16T20:26:18.388Z2026-07-10T03:10:42.1ZS-EPMC129299853454591410.1007/s12603-021-1669-4