Home blood pressure monitors are widely used by consumers yet cardiovascular health may be better defined by pulse-wave velocity (PWV). So far, the Withings Body Cardio scale is the only consumer device that has been designed to measure PWV and body composition, including fat mass (FM) and fat-free mass (FFM), in the home setting. While one study has demonstrated that this device meets the acceptable accuracy standards of the ARTERY Society, no study has accounted for the gravitational effect of standing on a scale on aortic-leg PWV. PURPOSE: The purpose of this study was to assess the accuracy of PWV and body composition as determined by the Body Cardio scale. METHODS: Measurements of PWV and body composition in healthy, young males and females (n = 20) using the Body Cardio device were compared to PWV assessed by applanation tonometry (SphygmoCor) and body composition analysis determined by air displacement plethysmography (Bod Pod). Bland-Altman analysis and mean absolute percent error (MAPE) were used to assess accuracy. RESULTS: Data are reported as the mean bias (95% confidence interval). The Body Cardio overestimated PWV by 0.68 m/s (-0.16, 1.51) and FM by 2.91 kg (-2.91, 8.73). Body Cardio PWV and FM estimations had a MAPE of 9.7% and 25.8%, respectively. The Body Cardio underestimated body mass (BM) and FFM by 0.11 kg (-0.41, 0.18) and 2.87 kg (-9.04, 3.30), respectively. Body Cardio BM and FFM estimations had a MAPE of 0.15% and 5.6%, respectively. CONCLUSIONS: The Body Cardio scale provides accurate measures of BM and PWV; however, it should be used cautiously for measures of FM and FFM.
Home blood pressure monitors are widely used by consumers yet cardiovascular health may be better defined by pulse-wave velocity (PWV). So far, the Withings Body Cardio scale is the only consumer device that has been designed to measure PWV and body composition, including fat mass (FM) and fat-free mass (FFM), in the home setting. While one study has demonstrated that this device meets the acceptable accuracy standards of the ARTERY Society, no study has accounted for the gravitational effect of standing on a scale on aortic-leg PWV. PURPOSE: The purpose of this study was to assess the accuracy of PWV and body composition as determined by the Body Cardio scale. METHODS: Measurements of PWV and body composition in healthy, young males and females (n = 20) using the Body Cardio device were compared to PWV assessed by applanation tonometry (SphygmoCor) and body composition analysis determined by air displacement plethysmography (Bod Pod). Bland-Altman analysis and mean absolute percent error (MAPE) were used to assess accuracy. RESULTS: Data are reported as the mean bias (95% confidence interval). The Body Cardio overestimated PWV by 0.68 m/s (-0.16, 1.51) and FM by 2.91 kg (-2.91, 8.73). Body Cardio PWV and FM estimations had a MAPE of 9.7% and 25.8%, respectively. The Body Cardio underestimated body mass (BM) and FFM by 0.11 kg (-0.41, 0.18) and 2.87 kg (-9.04, 3.30), respectively. Body Cardio BM and FFM estimations had a MAPE of 0.15% and 5.6%, respectively. CONCLUSIONS: The Body Cardio scale provides accurate measures of BM and PWV; however, it should be used cautiously for measures of FM and FFM.
Entities:
Keywords:
arterial health; body composition comparison; mobile health; pulse transit time
Authors: Zachary Beattie; Lyndsey M Miller; Carlos Almirola; Wan-Tai M Au-Yeung; Hannah Bernard; Kevin E Cosgrove; Hiroko H Dodge; Charlene J Gamboa; Ona Golonka; Sarah Gothard; Sam Harbison; Stephanie Irish; Judith Kornfeld; Jonathan Lee; Jennifer Marcoe; Nora C Mattek; Charlie Quinn; Christina Reynolds; Thomas Riley; Nathaniel Rodrigues; Nicole Sharma; Mary Alice Siqueland; Neil W Thomas; Timothy Truty; Rachel Wall; Katherine Wild; Chao-Yi Wu; Jason Karlawish; Nina B Silverberg; Lisa L Barnes; Sara Czaja; Lisa C Silbert; Jeffrey Kaye Journal: Digit Biomark Date: 2020-11-26