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Journal of Healthcare Engineering
Volume 6, Issue 4, Pages 673-690
Research Article

Predicting Neck Fluid Accumulation While Supine

Daniel Vena,1,2 Babak Taati,1,3 and Azadeh Yadollahi1,2

1University Health Network – Toronto Rehabilitation Institute, Toronto, Canada
2Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada
3Department of Computer Science, University of Toronto, Toronto, Canada

Received 1 May 2015; Accepted 1 July 2015

Copyright © 2015 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


When lying supine, fluid shifts rostrally from the legs and accumulates in the neck, which is a risk factor for obstructive sleep apnea. The objective of this study was to model neck fluid accumulation using one-time baseline measurements of body fluid, demographics, and anthropometrics. Using bioelectrical impedance, leg and neck fluid volumes (LFV and NFV) were measured continuously and simultaneously. Thirty non-obese adults (13 men) stood quietly for 5 minutes, and then lay supine for 90 minutes while fluid volumes were measured. Neck circumference (NC) was measured before and after the supine period. Results demonstrated that, compared to women, men experienced a greater increase in NC after lying supine. Furthermore, baseline LFV at the onset of lying supine was significantly correlated with ΔLFV (r = 0.44, p = 0.014) and ΔNC (r = 0.51, p = 0.008) after 90 minutes supine. The findings identify that sex and baseline LFV predict both the fluid leaving the legs and increase in NC during recumbency.