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![Polyelectrolyte-based conductive hydrogels: from theory to applications](https://image.oaes.cc/7a7c2dd8-fc84-421c-a70d-87456ca10d88/4978.fig.8.jpg)
Figure 8. Schematic diagram of the application of hydrogel strain sensor in detecting human motion. (A and C) Relative resistance changes of poly(sulfobetaine-co-acrylic acid)/chitosan-citrate (P(SBMA-co-AA)/CTS-Cit) DN hydrogel strain sensors at different angles of finger bending and (B) wrist bending. (D) Relative resistance changes of the hydrogel strain sensors when swallowing[74]. Reproduced with permission[74]. Copyright 2020, Elsevier.