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. 2021 Jun 28;376(1831):20200230. doi: 10.1098/rstb.2020.0230

Figure 1.

Figure 1.

Schematic for recording of physiological variables in wild-animal physiologging and human health monitoring technologies. (a) Typical device attachments include external devices recording motion, PPG and sampling fluids with microneedles, internal devices (dashed outline) recording blood chemistry and heart rate, and physiologically sensitive tattoos. (b) Basic hardware housed in externally attached devices records the suite of physiological variables in both systems.