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Wang et al. Soft Sci 2024;4:41 https://dx.doi.org/10.20517/ss.2024.53 Page 19 of 43

Figure 8. Principle, structure and application of fibric strain and pressure sensors. (A) Schematic diagram of a chest strap integrated with
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HFSSs; (B) Routine electrical signals from the HFSS-based chest strap during human respiration . Copyright 2022, American Chemical
Society; (C) Illustration of the yarn-based stretchable sensing device; (D) Photographs of the wearable sign-to-speech interpretation
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system . Copyright 2020, Springer Nature; (E) Capacitive soft strain sensor mounted on textile across the knee; (F) Normalized decay
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time of the sensor output at different walking speeds . Copyright 2015, John Wiley and Sons; (G) Schematic illustration showing
structural change of the pressure sensor under the applied pressure; (H) Photograph of a human hand wearing the smart glove with five
pressure sensors on each finger when grabbing an apple; (I) Resistance response of the pressure sensor when grabbing and releasing an
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apple . Copyright 2020, American Chemical Society. Application of wearable devices for (J) detecting breathing and (K) monitoring
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pulses . Copyright 2019, American Chemical Society; (L) Schematic diagram of a fibric triboelectric sensor in combination with
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clothing. Reproduced with permission . Copyright 2020, American Association for the Advancement of Science. HFSSs: Helical fiber
strain sensors.