Velarde et al. (1998) reported that the electrical system is the most widely used stunning method in the European Union, and that it consists of passing electricity through the brain to produce instantaneous insensibility; stunning is achieved by inducing a tonic/clonic epileptic fit, before any pain stimulus associated with the application itself is detected and transmitted to the central nervous system (15 milliseconds). Velarde et al. (1998) said that due to its adverse effects on meat quality and on animal welfare (recovery of sensibility) in many Spanish abattoirs the traditional head-only electrical stunning has been replaced by the head-to-chest electrical stunner combined with the chest-belt restrainer (Midas system). The application of the cardiac arrest cycle has a major animal welfare advantage in that it promotes the start of death at the point of stun and relegates sticking to a method of removing blood from the carcass (Wotton and Gregory, 1986).