Figure 6.
(a) Developed equivalent circuit model for the electrodes tested on leg muscle, with circuit elements including the electrode-skin impedance (Zelectrode-skin) and the body resistance (Rbody). The Zelectrode-skin is composed by electrode resistance (Relectode), and charge-transfer resistance (RT) and double-layer constant-phase element (ZCPE) at the electrode-skin interface; (b) A simplified equivalent circuit model for data fitting, with circuit elements including the total resistance (Rall) of body (Rbody) and electrode (Relectode), total charge-transfer resistance (RT-all) and total double-layer constant-phase element (ZCPE-all) at the electrode-skin interface.