Fig. 4: Actual tests in which volunteers participated.
From: High-precision flexible sweat self-collection sensor for mental stress evaluation
A The variation of cortisol concentration in normal subjects during the day. B Cortisol levels increase significantly after exercise. C The electrodes were tested after the fingers were incubated for 30 s. D–I Five volunteers were selected to measure cortisol levels in their sweat between 7 a.m. and 7 p.m., and two volunteers were asked to observe the effect of exercise on cortisol levels after exercise.
