Which statement best describes sensory adaptation during electrotherapy?

• A. Abrupt drops in output indicate device malfunction.
• B. Gradual reduction in sensation at a constant amplitude indicates sensory adaptation.
• C. Immediate increase in sensation indicates tissue sensitization.
• D. The device automatically reboots during stable use.

Answer: (B)

During electrotherapy, sensory adaptation is when the patient’s perception of the stimulus diminishes over time even though the current stays the same. This happens because the nerve fibers and skin receptors become less responsive with continuous stimulation, so the perceived intensity fades gradually. That gradual drop in sensation at a fixed amplitude is the clearest sign that adaptation is occurring. It differs from device issues, which would cause abrupt changes in output, and from tissue sensitization, which would present as an increasing or heightened sensation. The unrelated option about the device rebooting isn’t part of the physiological response to ongoing stimulation. In practice, clinicians watch for this fading sensation and may adjust the treatment—such as using ramped onset, intermittent stimulation, or changing the duty cycle—to keep the experience comfortable while maintaining effectiveness.