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To address these issues, a triple-network hydrogel composed of polyacrylamide, gelatin, and carboxymethyl cellulose was designed, synergistically integrated with LiCl, CaCl2, and glycerol. In this design, glycerol serves as the primary cryoprotectant, Li+ ions provide ionic conduction, and Ca2+ crosslinks reinforce the polymer network. The optimized hydrogel achieves high tensile strength (576 kPa), ultra-high stretchability (938%), outstanding toughness (233.4 kJ\/m3), and high conductivity (2.95 S\/m), while completely suppressing ice crystallization down to \u221280 \u00b0C. As a strain sensor, it delivers a gauge factor of 3.53 after freezing; as a bioelectrode, it records high-quality EMG, ECG, EOG, and EEG signals comparable to or surpassing commercial Ag\/AgCl electrodes, and maintains reliable performance over 24 h at \u221220 \u00b0C. 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