Ultrasound-Derived Forearm Muscle Thickness Is a Powerful Predictor for Estimating DXA-Derived Appendicular Lean Mass in Japanese Older Adults.
To test the validity of published equations, anterior forearm muscle thickness (MT-ulna) of 158 Japanese older adults (72 men and 86 women) aged 50-79 y was measured with ultrasound. Appendicular lean soft tissue mass (aLM) was estimated from MT-ulna using two equations (body height without [eqn 1] and with [eqn 2]) previously published in the literature. Appendicular lean mass was measured using dual-energy X-ray absorption (DXA), and this method served as the reference criterion. There was a strong correlation between DXA-derived and ultrasound-estimated aLM in both equations (r = 0.882 and r = 0.944). Total error was 2.60 kg for eqn (1) and 1.38 kg for eqn (2). A Bland-Altman plot revealed that there was no systematic bias between DXA-derived and ultrasound-estimated aLM; however, eqn (1) overestimated aLM compared with DXA-derived aLM. Our results suggest that an ultrasound MT-ulna equation that includes body height is appropriate and useful for estimating aLM in Japanese adults.
Department of Sports and Life Sciences, National Institute of Fitness and Sports in Kanoya, Kanoya, Kagoshima, Japan. Electronic address: t12abe@gmail.com.
Takashi
T
Abe
Department of Sports and Life Sciences, National Institute of Fitness and Sports in Kanoya, Kanoya, Kagoshima, Japan.
Eiji
E
Fujita
Department of Kinesiology, Texas Wesleyan University, Fort Worth, Texas, USA.
Robert S
RS
Thiebaud
Department of Health, Exercise Science, & Recreation Management, Kevser Ermin Applied Physiology Laboratory, University of Mississippi, University, Mississippi, USA.
Jeremy P
JP
Loenneke
Department of Sports and Life Sciences, National Institute of Fitness and Sports in Kanoya, Kanoya, Kagoshima, Japan.
Takuya
T
Akamine
D015502:Absorptiometry, Photon / Q000379:methods*; D000273:Adipose Tissue / Q000033:anatomy & histology*; D000368:Aged; D001823:Body Composition; D005260:Female; D005542:Forearm / Q000033:anatomy & histology*; D015577:Geriatric Assessment / Q000379:methods*; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D015203:Reproducibility of Results; D014463:Ultrasonography / Q000379:methods*
B-Mode ultrasound; Forearm muscle thickness; Muscle mass