Low-frequency TENS stimulates which type of pain control?

• A. Opiate mediated control of pain
• B. Heat production
• C. Mechanoreceptor stimulation overriding pain impulses
• D. Local inflammation reduction

Answer: (A)

Low-frequency TENS works by triggering the body's own opioid system to relieve pain. When you stimulate at a low frequency, it prompts the release of endogenous opioids such as endorphins and enkephalins, which then act on opioid receptors in the spinal cord and brain to dampen pain signals. This opioid-mediated analgesia can persist after the stimulation stops because the body’s natural pain-relief pathways have been activated.

This differs from heat production or direct heating effects, which aren’t how TENS provides pain relief. While mechanoreceptor input from any TENS stimulus can contribute to pain modulation, the hallmark of low-frequency TENS is activating the endogenous opioid system rather than simply gating via mechanoreceptors. Local inflammation reduction isn’t a primary action of low-frequency TENS either.

So, the best description is opiate-mediated pain control.