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What was studied?
The review draws together evidence on how manipulation activates muscle spindles, Golgi tendon organs and Pacinian corpuscles, the sensory receptors that detect stretch, tension and pressure, during the fast, precise forces used in a thrust.
What did they find?
Muscle spindle discharge rates increased by around 201% during the thrust phase of a manipulation, producing a brief, intense, synchronised burst of sensory signal from the treated area. This burst may trigger lasting changes in nerve communication.
Why it matters
This answers a fair question about what manipulation is actually doing biologically. It produces a real, measurable burst of nervous system activity, not just a mechanical click, with effects that can outlast the treatment itself.
Why we included it
It illustrates the biological plausibility behind manual therapy's effects, showing a brief physical treatment can trigger changes in the nervous system that last well beyond the moment of contact.