A NASICON-type ceramic (high sodium ion conductor) is proposed to reco
rd bioelectric signals. The electrode does not need gel before its app
lication. The principle of the measurements is based on a sodium ion e
xchange between the skin and the material. Electrical measurements per
formed in saline solutions show that the electrode is slightly polaris
able. The skin-electrode impedance was investigated. The impedance dec
reases as a function of the time of application. The resistive compone
nt is the major source of the impedance change. This can be explained
by the perspiration process which occurs immediately with time after t
he application of the NASICON-based electrode on the skin. The skin co
ndition is also an important parameter. NaCl saline solution or abrasi
on causes the resistance to decrease markedly.