Devices containing the silver chloranilate reagent and an empty reference device were mounted on the midline of ventral forearm approximately 1 cm apart. Subjects swam for 45 min (~2500 m) or biked for 30 min (~14 km), and at least 15 μl of sweat was collected in the reference device. Imaging of devices within 5 min of finishing the exercise using a Canon EOS Rebel T6i DSLR camera enabled extraction of the LAB color values in Photoshop. Converting the a* and b* color values using the calibration curve produced the chloride concentration measurement.

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