Fig. 5: Gaseous emissions to CO2, and VOC stimuli and corresponding benchtop calibration and proof of principle physiological stimuli. | Nature Communications

Fig. 5: Gaseous emissions to CO2, and VOC stimuli and corresponding benchtop calibration and proof of principle physiological stimuli.

From: Wearable continuous diffusion-based skin gas analysis

Fig. 5

a Schematic outline of benchtop experimentation to yield calibration data for DBGS CO2 measurements. b Calibration results from increasing CO2 mixtures by volume against differential sensor readings. R2 coefficient of determination. c Time to achieve stable sensor readings. d Schematic outline of benchtop experimentation to yield calibration data for DBGS VOC measurements. VOC volatile organic compounds. e Calibration results for increasing VOC mixtures by dilution of 91% ethanol with distilled water. R2 coefficient of determination. f Required time to achieve 63% (black, t63) and 95% (red, t95) of maximal response to increasing concentrations of VOC. g Top: Response to stationary bike exercise. Bottom: Repeated experiment. h Top: Response to alcohol ingestion Bottom: Repeated experiment. The grey bar indicates ingestion time. i Top: Response to neuropsychological mental-fatigue test, A–X continuous performance task (AX-CPT). Bottom: Repeated experiment. Grey bars indicate the start and end of the test.

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