Fig. 5.

Practical application examples of skin-mounted, stretchable systems capable of temperature logging and wireless data transmission. (A) Optical images of a device laminated onto the forearm of a subject during exercise on a stationary bike. (B) Temperature data recorded immediately before (“ready”), during (“exercise”), and immediately after (“rest”) exercise on the bike, where the red squares correspond to temperature determined in an adjacent skin-mounted NFC device without a battery module (AMS NFC); the open circles correspond to the battery-integrated system (TI NFC). (C) IR images corresponding to each stage of the evaluation. (D) Graph of temperature response to breathing. (E) Graph of change in the temperature of skin on the forearm during immersion of the lower body in warm water. (F) Image of a device during application of hot air, to illustrate illumination of a red LED as an indicator of temperature values above a set threshold and (G) IR images before and after applying hot air.