Fig. 5.

Continuous monitoring of heart signals (seismocardiography) using the all-nanofiber mechanoacoustic sensor. (A) Heart signals (initial, after 5 h, and after 10 h), and the corresponding spectrograms. (B) SNR and heart rate in BPM during the 10-h experimental period. The black curve represents the SNR, and blue represents the BPM. (C and D) Comparison of the heart signals measured by a commercial cardiac microphone and an all-nanofiber sensor. Heart signals were measured continuously for 30 min. (D) A magnified version of the signals in C.