Abstract
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.
Highlights
There is a growing interest from consumers, healthcare providers and researchers in using consumer devices to monitor cardiovascular health outside the healthcare provider’s office
Pulse wave velocity (PWV) is another valuable measure of vascular health because this measure is an indicator of arterial stiffness
The purpose of this study was to assess the accuracy of a consumer device, the Withings Body Cardio scale (Withings, Issy-les Moulineux, France), that measures PWV and body composition including body mass (BM), fat mass (FM) and fat-free mass (FFM), as valuable measures of vascular health
Summary
There is a growing interest from consumers, healthcare providers and researchers in using consumer devices to monitor cardiovascular health outside the healthcare provider’s office. Pulse wave velocity (PWV) is another valuable measure of vascular health because this measure is an indicator of arterial stiffness. Arterial stiffness relates to the mechanical properties of arteries that subsequently affect cardiovascular health. In a healthy or young population, arteries are more distensible when compared to an unhealthy or older population [1]. Arterial distensibility is critical for health because it helps attenuate pulsatile flow and aligns the timing of pressure waves returning to the heart for optimal coronary perfusion. Arterial stiffness is considered a major risk factor of cardiovascular disease and has been shown to be a predictor of cardiovascular and coronary heart events
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