Electromagnetic fields affect biological systems such as humans in very many different ways. The effect depends primarily on the frequency and field strength of a given electromagnetic field, but also on an individual's characteristics such as body shape and size.
Within the resonance range, that is, when body measurements coincide approximately with the wavelength, the amount of absorbed radiation energy is the highest.
For adults this resonance ranges from about 30 to 100 MHz, that is, in the TV and FM range. Since the wavelength decreases with increasing frequency,
are more greatly affected by higher frequencies. Their resonance ranges up to 300 MHz where we find such wireless applications as digital, pulsed microwave radio relays or aviation radio communication systems.
Even though up to about 300 GHz the energy is too low (or insufficient) to produce an ionization effect, electrical and electrochemical processes within the human body can become affected.
No matter how small, but any muscle activity or sensory perception is linked with an electrical signal.
For the various effects, we can distinguish between extremely low frequency (ELF) and radio-frequency (RF) electromagnetic fields.