Principles of Chiropractic (POC) Exam 1 Practice

A high-velocity, low-amplitude adjustment delivers a quick stretch to the muscle-tendon units, which activates muscle spindle receptors. This sudden stretch transiently resets the spindle's sensitivity, allowing the muscle to relax a bit and ROM to temporarily improve. That’s why the best description is placing a quick stretch to reset ROM. The other ideas don’t fit the neuromuscular response: adjustments don’t cause a global decrease in all muscle activity, there is typically some effect, and spindle sensitivity changes are linked to ROM rather than being unrelated to it.