Fig. 4 Piezoresistive e-skin with interlocked microdome array for simultaneous monitoring of artery pulse pressure and temperature. Piezoresistive e-skin.

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Fig. 4 Piezoresistive e-skin with interlocked microdome array for simultaneous monitoring of artery pulse pressure and temperature. Piezoresistive e-skin with interlocked microdome array for simultaneous monitoring of artery pulse pressure and temperature. (A) Photograph of a wearable e-skin for monitoring artery pulse pressure and temperature. The enlarged schematic illustrations indicate the effect of temperature on the constriction (cold) and dilation (warm) of arterial vessels. (B) Relative resistance variations in response to artery pulse pressure. The pulse pressure waveform consists of three peaks corresponding to pulse pressure (P1) and reflected wave pressures from the hand (P2) and lower body (P3). P1 is the difference between the systolic (PSys) and diastolic (PDia) pressures. (C) Variation of the pulse pressure waveforms before (black) and after (red) physical exercise. (D) Relative resistance change of the artery pulse pressure waveforms as a function of skin temperature (20° to 42°C). (E) Comparison of the variation of artery pulse pressure waveform at different skin temperatures. The data in (D) are used with the data-offset modification for the comparison. (F) The blood pressure and temperature information acquired from the measurements in (E); variations of relative resistance (R/R0) (black), radial artery augmentation index (AIr = P2/P1) (blue), radial diastolic augmentation index (DAI = P3/P1) (green), and round trip time for the reflected wave from the hand periphery (TR) (purple) as a function of skin temperature. Jonghwa Park et al. Sci Adv 2015;1:e1500661 Copyright © 2015, The Authors