In rats with muscle soreness after exercise, two brain-chemical pathways team up to make muscles extra sensitive to pain, especially when certain pain-related proteins are present at low levels — and they both work through specific pain sensors in the nerves.

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Neurochemical mechanism of muscular pain: Insight from the study on delayed onset muscle soreness

Narrative Review

Animal

2024 Jan 24

The study looks at how muscle pain develops in rats after unusual exercise and finds that two specific chemical pathways in the nerves are involved, which supports the idea that multiple systems work together to cause soreness.

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Neurochemical mechanism of muscular pain: Insight from the study on delayed onset muscle soreness

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DOI: 10.1186/s12576-023-00896-y

Similar Assertions

In rats, sore muscles after unusual exercise seem to start with a specific pain signal (called bradykinin) turning on right when the exercise happens. If you block that signal before exercise, the rats don’t get sore — but only if you block it early.

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When rats do certain muscle exercises, they get sore deep in their muscles—not on the skin—starting a day later, peaking after 2–3 days, and going away by day 4. This soreness is due to increased sensitivity in the muscles themselves.

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Even if a rat's muscles aren't actually torn or damaged, it can still feel sore after exercise — this soreness seems to come from nerve sensitivity, not from physical damage, especially when the exercise isn't too intense.

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