title: Mobile evaluation of human energy balance and weight control: Potential for future developments.
abstract: Quantification of energy storage is essential in understanding energy balance and can be determined by bioelectrical impedance analysis (BIA). Here, we have developed a smartphone form factor multi-frequency BIA device that incorporates an analog front end for body composition measurements. The device was compared against a reference gel-electrode based BIA system in a clinical trial of 311 subjects for predicting BIA equations by calibrating the impedance index to body composition data from dual energy X-ray absorptiometry (DXA). Strong correlations were observed between DXA-based lean soft tissue and the impedance index generated at 50 KHz (R(2)=0.87; p<;0.001). A similar trend was also evident at higher frequencies which matched results from the reference gel-electrode BIA device. The findings support the role of our consumer-oriented mobile Health initiative for multi-frequency BIA assessments to aid weight management.
authors.forename: Steven B
authors.initials: SB
authors.lastname: Heymsfield
authors.forename: Justin Younghyun
authors.initials: JY
authors.lastname: Kim
authors.forename: Yusuf A
authors.initials: YA
authors.lastname: Bhagat
authors.forename: Jolene
authors.initials: J
authors.lastname: Zheng
authors.lastname: Insoo Kim
authors.lastname: Ahyoung Choi
authors.lastname: Seongwook Jo
authors.lastname: Jaegeol Cho
mesh_terms: D015502:Absorptiometry, Photon; D000273:Adipose Tissue; D001823:Body Composition; D001835:Body Weight; D017097:Electric Impedance; D006801:Humans; D000068997:Smartphone; D017216:Telemedicine