Agreement of Seca 286 Scale Weight with DXA Acquisition Weight, APEX Soft-Tissue Mass, and DXA Sum-of-Components Mass in Collegiate Rugby Athletes

Authors

Matthew Poole, Sam Houston State UniversityFollow
Hayden Johnson, Sam Houston State UniversityFollow
Christian Rivera, Sam Houston Station UniversityFollow
Stephanie Hansford, Sam Houston State UniversityFollow
Regan Renfro, Sam Houston State UniversityFollow
Dalton Prye, Sam Houston State UniversityFollow
Saheed Jaiyeola, Sam Houston State UniversityFollow
Sage A. Newman, Sam Houston State UniversityFollow
Adesiji Adetona, Sam Houston State UniversityFollow
Oscar Woodside, Sam Houston State UniversityFollow
Jmya Hughes, Sam Houston State UniversityFollow
Preston James, Sam Houston State UniversityFollow
Kelly Hines, University at BuffaloFollow
Jade Simon, Sam Houston State UniversityFollow
Drew E. Gonzalez, Sam Houston State UniversityFollow
Christopher D. GreenleafFollow
Micheil Spillane, Sam Houston State UniversityFollow

Abstract

Accurate body mass is foundational for DXA-derived indices and longitudinal tracking. PURPOSE: Determine agreement between Seca 286 scale weight and DXA acquisition weight, quantify the difference between DXA acquisition weight and the APEX whole-body mass field (fat + lean), and evaluate a DXA sum-of-components mass (fat + lean + BMC) relative to scale weight as an internal QC check (Houtkooper et al., Am J Clin Nutr, 2000). METHODS: Twenty-one male rugby union athletes completed same-morning testing (06:00–09:00 h) while fasted and post-void; caffeine was restricted (≥12 h) and exercise abstained (≥24 h). Hydration was screened prior to DXA. Body mass was measured in light clothing using a Seca 286 ultrasonic station (kg; 0.01-kg resolution) verified via manufacturer calibration check. Whole-body DXA was performed on Hologic Horizon W (APEX v5.6.1.3 rev 007); standard tissue analysis; daily QC within tolerance). DXA weight (kg) was entered from the same Seca 286 within 5 min of the DXA scan (no repeat weigh-ins). APEX exported whole-body mass equals the sum of whole-body fat and lean fields; a sum-of-components mass was computed as fat + lean + BMC. Paired comparisons, Pearson r, ICC(2,1), and Bland–Altman bias/limits of agreement (LoA) were computed. RESULTS: Seca 286 weight (91.48 ± 23.40 kg) was slightly lower than DXA acquisition weight (91.68 ± 23.42 kg) by -0.20 ± 0.13 kg (LoA -0.46 to 0.07 kg), with excellent agreement (r=0.99998; ICC=0.99995). The APEX whole-body mass field (fat + lean) was -1.98±1.02 kg lower than acquisition weight (LoA -3.98 to 0.03 kg). The DXA sum-of-components mass (fat + lean + BMC) was 1.43 ± 0.86 kg higher than Seca weight (LoA -0.25 to 3.12 kg; r=0.99946; ICC=0.99745). CONCLUSION: Under standardized conditions, Seca 286 and DXA acquisition weights show near-identical agreement; however, DXA mass fields differ by definition (soft tissue vs soft tissue+BMC) and can introduce systematic offsets. Investigators should pre-specify and consistently use the same mass variable when computing DXA-derived indices or tracking change over time.

Recommended Citation

Poole, Matthew; Johnson, Hayden; Rivera, Christian; Hansford, Stephanie; Renfro, Regan; Prye, Dalton; Jaiyeola, Saheed; Newman, Sage A.; Adetona, Adesiji; Woodside, Oscar; Hughes, Jmya; James, Preston; Hines, Kelly; Simon, Jade; Gonzalez, Drew E.; Greenleaf, Christopher D.; and Spillane, Micheil (2026) "Agreement of Seca 286 Scale Weight with DXA Acquisition Weight, APEX Soft-Tissue Mass, and DXA Sum-of-Components Mass in Collegiate Rugby Athletes," International Journal of Exercise Science: Conference Proceedings: Vol. 2: Iss. 18, Article 230.
Available at: https://digitalcommons.wku.edu/ijesab/vol2/iss18/230