TY - JOUR
T1 - Longitudinal concordance of body composition and anthropometric assessment by a novel smartphone application across a 12-week self-managed weight loss intervention
AU - Smith, Marc K. K.
AU - Staynor, Jonathan M. D.
AU - El-Sallam, Amar
AU - Ebert, Jay R. R.
AU - Ackland, Tim R. R.
N1 - Publisher Copyright:
© The Authors 2023.
PY - 2023/10/14
Y1 - 2023/10/14
N2 - Smartphone applications (SPA) now offer the ability to provide accessible in-home monitoring of relevant individual health biomarkers. Previous cross-sectional validations of similar technologies have reported acceptable accuracy with high-grade body composition assessments; this research assessed longitudinal agreement of a novel SPA across a self-managed weight loss intervention of thirty-eight participants (twenty-one males, seventeen females). Estimations of body mass (BM), body fat percentage (BF%), fat-free mass (FFM) and waist circumference (WC) from the SPA were compared with ground truth (GT) measures from a dual-energy X-ray absorptiometry scanner and expert technician measurement. Small mean differences (MD) and standard error of estimate (SEE) were observed between method deltas (Delta BM: MD = 0 center dot 12 kg, SEE = 2 center dot 82 kg; Delta BF%: MD = 0 center dot 06 %, SEE = 1 center dot 65 %; Delta FFM: MD = 0 center dot 17 kg, SEE = 1 center dot 65 kg; Delta WC: MD = 1 center dot 16 cm, SEE = 2 center dot 52 cm). Concordance correlation coefficient (CCC) assessed longitudinal agreement between the SPA and GT methods, with moderate concordance (CCC: 0 center dot 55-0 center dot 73) observed for all measures. The novel SPA may not be interchangeable with high-accuracy medical scanning methods yet offers significant benefits in cost, accessibility and user comfort, in conjunction with the ability to monitor body shape and composition estimates over time.
AB - Smartphone applications (SPA) now offer the ability to provide accessible in-home monitoring of relevant individual health biomarkers. Previous cross-sectional validations of similar technologies have reported acceptable accuracy with high-grade body composition assessments; this research assessed longitudinal agreement of a novel SPA across a self-managed weight loss intervention of thirty-eight participants (twenty-one males, seventeen females). Estimations of body mass (BM), body fat percentage (BF%), fat-free mass (FFM) and waist circumference (WC) from the SPA were compared with ground truth (GT) measures from a dual-energy X-ray absorptiometry scanner and expert technician measurement. Small mean differences (MD) and standard error of estimate (SEE) were observed between method deltas (Delta BM: MD = 0 center dot 12 kg, SEE = 2 center dot 82 kg; Delta BF%: MD = 0 center dot 06 %, SEE = 1 center dot 65 %; Delta FFM: MD = 0 center dot 17 kg, SEE = 1 center dot 65 kg; Delta WC: MD = 1 center dot 16 cm, SEE = 2 center dot 52 cm). Concordance correlation coefficient (CCC) assessed longitudinal agreement between the SPA and GT methods, with moderate concordance (CCC: 0 center dot 55-0 center dot 73) observed for all measures. The novel SPA may not be interchangeable with high-accuracy medical scanning methods yet offers significant benefits in cost, accessibility and user comfort, in conjunction with the ability to monitor body shape and composition estimates over time.
KW - Two-dimensional images
KW - Dual-energy X-ray absorptiometry
KW - Digital anthropometry
KW - Weight-loss monitoring
KW - X-RAY ABSORPTIOMETRY
KW - FAT
UR - http://www.scopus.com/inward/record.url?scp=85147343142&partnerID=8YFLogxK
U2 - 10.1017/S0007114523000259
DO - 10.1017/S0007114523000259
M3 - Article
C2 - 36700352
SN - 0007-1145
VL - 130
SP - 1260
EP - 1266
JO - British Journal of Nutrition
JF - British Journal of Nutrition
IS - 7
ER -