Fig. 4: Device prototype.
From: Multi-sensing yarns for continuous wireless sweat lactate monitoring
A On body testing setup including readout electronics, sensor braid and encapsulation patch. B Screen capture of iOS application with real-time readout of pH and lactate sensor values. C Exploded diagram of multi-layer encapsulation patch for on-body testing. D Verification of mobile readout electronics with benchtop testing showing simultaneous outputs from pH and lactate sensors, and an external reference electrode (Ag/AgCl). NaOH (~0.4 pH change) and lactate (1 mM) were added showing raw output (in mV) with no observable crosstalk aside from stirring-induced noise. E On body testing data from participant 1 collected during stationary biking. Simultaneous readout of pH and lactate data from the sensor patch correlated with a skin pH probe (Hanna) and L-lactate assay kit (recorded downstream from collected sweat at multiple time points).
