NMES systems and methods for stimulating muscle tissue, and in some embodiments deep muscle tissue. The control unit is configured for causing a tray rise and lower as desired. In formula, n represents an integer of 8, 10, 12 or 14; m represents an integer of 3 or 4; and X, Y and Z each independently represent a hydrolyzable group that is a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, or a halogen atom.