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Figure 6. Demonstration of PCM organohydrogel wearable strain sensors for monitoring human activities. (A) Repetitive sensing signals
during speaking. ΔR/R of the PCM organohydrogel in response to finger bending at (B) low temperature and (C) high temperature
0
environments; (D) Knee bending signal detection using the initial and healed PCM organohydrogel sensors; (E and F) Applications of the
PCM organohydrogel in Morse code transmission. EMG signals recording from the (G) bicep and (H) forearm using the PCM
organohydrogel; (I) Interfacial impedance comparison of the PCM organohydrogel electrodes and commercial gel electrodes; (J) EMG
signals and SNR measured by PCM organohydrogel electrodes and commercial hydrogel electrodes; (K) Characteristic EMG signals
corresponding to specific gestures; (L) EMG signals from the calf muscle area during jumping; Informed signed consent was obtained
from the volunteer for the human biosignal detection experiments. PCM: PAM/CS/MXene; EMG: electromyography; SNR: signal-to-
noise ratio.

same ball sport [Supplementary Figures 24-28]. Impressively, standardized electrical response signals for
each sport exhibit distinct differences [Figure 7A], highlighting significant potential for precise ball game
recognition.