“…[18][19][20][21] In particular, wearable mechanical sensors reported lately can track a multitude of vital human physiological parameters including pulse rate, [19] gait, [22,23] respiration rate, [24] and various joint movements. [18,25,26] In general, based on their underlying sensing mechanism, mechanical sensors can be categorized into piezoelectric, [27][28][29][30][31] capacitive, [32][33][34][35] piezoresistive, [25,26,[36][37][38][39][40] and others (such as triboelectric, [41,42] optical, [43,44] and transistor, [45][46][47] based). Of all the major sensing mechanisms, capacitive and piezoresistive sensing mechanisms remain the most popular and widely used because of their simple implementation, excellent resolution, and superior static and dynamic sensing performance.…”