What does “duty cycle” measure in electrical stimulation?

The correct choice pertains to the concept of "duty cycle," which specifically measures the proportion of time that the electrical current is active compared to the total cycle time. It is typically expressed as a percentage and is crucial in electrical stimulation therapies because it dictates how long the stimulation is applied versus how much downtime there is for the tissue between impulses.

In practical terms, a higher duty cycle means that the current is on for a greater part of the time, which can lead to more prolonged muscle contraction or stimulation. Conversely, a lower duty cycle allows for longer rest periods, which can be important for preventing fatigue or discomfort in the muscles being stimulated. This measurement is vital for tailoring treatment protocols to optimize therapeutic effects while minimizing adverse reactions.