Which frequency range is associated with Electro-Stimulatory Effects?

Which frequency range is associated with Electro-Stimulatory Effects?

• A. 3 Hz-3 kHz
• B. 3 kHz-5 MHz
• C. 100 kHz-3 GHz
• D. 3 GHz-300 GHz

Answer: (B)

Electro-stimulatory effects happen when a time-varying electric field drives currents in body tissues large enough to depolarize nerves or activate muscles. The 3 kHz to 5 MHz range is the mid-frequency band where the tissue impedance and penetration allow enough current to reach neural and muscular targets before heating becomes the dominant concern. At frequencies much lower, the induced currents aren’t as effective at stimulating deep nerves, and at much higher frequencies, currents tend to be confined to surface layers and the stimulation threshold isn’t reached as easily, so heating or other interactions dominate instead. This mid-band range is therefore the one most closely associated with electro-stimulatory effects.

Electro-stimulatory effects happen when a time-varying electric field drives currents in body tissues large enough to depolarize nerves or activate muscles. The 3 kHz to 5 MHz range is the mid-frequency band where the tissue impedance and penetration allow enough current to reach neural and muscular targets before heating becomes the dominant concern. At frequencies much lower, the induced currents aren’t as effective at stimulating deep nerves, and at much higher frequencies, currents tend to be confined to surface layers and the stimulation threshold isn’t reached as easily, so heating or other interactions dominate instead. This mid-band range is therefore the one most closely associated with electro-stimulatory effects.