Based on Gate Control Theory, which TENS parameter combination provides pain relief?

Based on Gate Control Theory, which TENS parameter combination provides pain relief?

• A. Intensity: motor, pulse freq: 80 pps, pulse duration: 75 microseconds
• B. Intensity: sensory, pulse freq: 60 pps, pulse duration: 75 microseconds
• C. Intensity: sensory, pulse freq: 80 pps, pulse duration: 150 microseconds
• D. Intensity: sensory, pulse freq: 80 pps, pulse duration: 75 microseconds

Answer: (D)

Activating non-painful, large-diameter afferent fibers at a sensory level can “close the gate” to pain signals in the spinal cord, reducing perceived pain. For this to work with TENS, you want the stimulus to be felt as tingling (sensory level) rather than causing muscle contraction (motor level) and to stimulate frequently with a short pulse width so the A-beta fibers are preferentially activated without engaging pain fibers. The best parameter set fits sensory intensity with a high frequency and a short pulse duration—80 pps and 75 microseconds—so you get robust, sustained gating through A-beta fiber input while remaining comfortable. The other options either bring in motor contraction or use settings that are less optimal for targeting the fast, non-nociceptive input that closes the gate.

Activating non-painful, large-diameter afferent fibers at a sensory level can “close the gate” to pain signals in the spinal cord, reducing perceived pain. For this to work with TENS, you want the stimulus to be felt as tingling (sensory level) rather than causing muscle contraction (motor level) and to stimulate frequently with a short pulse width so the A-beta fibers are preferentially activated without engaging pain fibers.

The best parameter set fits sensory intensity with a high frequency and a short pulse duration—80 pps and 75 microseconds—so you get robust, sustained gating through A-beta fiber input while remaining comfortable. The other options either bring in motor contraction or use settings that are less optimal for targeting the fast, non-nociceptive input that closes the gate.