Tiny electrical current exists in the human body due to the chemical reactions that occur as part of the normal bodily functions, even in the absence of external electric fields so that exposure of external radiation causes high impact to the nerves relaying signals by transmitting electric impulses. The heart is electrically active and its actions are measured using an electrocardiogram. Even a slight variation in heart rate may cause serious effects on the human body. Low-frequency electric fields influence the human body just as they influence any other material made up of charged particles. When electric fields act on conductive materials, they influence the distribution of electric charges at their surface. Low-frequency magnetic fields induce circulating currents within the human body. The strength of these currents depends on the intensity of the external magnetic field. Due to the invention of information technology, the communication devices are more in use resulting in overall emission of radioactive waves affecting heart rate. It depends on Specific Absorption Rate (SAR) which is the measure of the rate at which energy is absorbed by the human body when exposed to radio frequency (RF) electromagnetic field. Heart rate variability is measured by ECG and the results are analysed.