Interpulse interval is defined as the interval between which events?

• A. Between the first and second phases of a single pulse
• B. Between two successive peaks of a single pulse
• C. Between one pulse and the next pulse
• D. Between zero and peak in the waveform

Answer: (C)

Interpulse interval is the off time between pulses in a train—the time from the end of one pulse to the start of the next. This gap determines how often pulses are delivered (the stimulation frequency) and affects tissue recovery, comfort, and how quickly nerves can respond again. It’s separate from the interval inside a single pulse between its phases (interphase interval) and from the rise from zero to peak within a pulse. So the best description is the time between one pulse and the next pulse.