Simulated ESDs are like ones being normally experienced and therefore they themselves do not give us a harmful effect.  But a care should be taken not to have a secondary (subsequent) event such as that the body is hit to something with surprise. 

Needless to say, the simulator should not be used by people fitted with electronic medical devices such as pacemakers and such people should not enter the testing site while the instrument is operating.  Failure to follow this rule risks death or serious injury.