Diadynamic currents are a group of low-frequency iterative currents that possess three biological effects:

• A stimulating effect on sensitivity, muscle activity, trophism
• An inhibitory effect on muscle sensitivity and contraction with decreased contractures
• A habituation reaction leading to cancellation of the biological action, which appears very rapidly with currents of constant intensity and frequency

In reality, diadynamic currents are mainly used for antalgic purposes (inhibition) so only certain forms of current are used:

• fixed phase current
• short period current
• long-term current

Despite their widespread use, such currents still present quite a few questions about their mechanism of action. Currently, the most widely accepted one is a decrease in nerve conductivity due to hyperpolarization at the anode (positive pole).