To obtain a better signal, it is suggested to apply conductive cream (or simply glycerin-based cream). Simply apply a nickel-sized amount of conductive cream on each of the cardiac electrodes is necessary to improve the cardiac signal.
Our cardiac sensors record electrical activity on the surface of the skin. Since skin cells are considered good resistors, without any conductive agent, it can become very difficult to record accurately any electrical activity at the skin surface.
* Note: keep in mind that if you are using water instead of cream, you might have to re-moisten the cardiac sensors more frequently (every ~ 1-2 hours) than if you are using cream (every ~ 24 hours). However, if you are performing intense physical activity, your sweat will replace the water.
Keywords: cardiac electrode, textile electrode, conductivity, quality signal, water, sweat, moist, moister