When your muscles get damaged from intense exercise, they start breaking down more protein and stop building new muscle as well, which makes you recover slower and feel weaker in your next workout.
Evidence from Studies
Supporting (0)
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Contradicting (3)
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Eccentric exercise per se does not affect muscle damage biomarkers: early and late phase adaptations
The study found that when people first do intense eccentric exercises (like lowering weights slowly), their muscles get sore and damaged — but after doing it regularly, the damage goes away, and they still get stronger. This means muscle damage isn’t needed to get stronger, and it doesn’t always hurt recovery.
β-Hydroxy-β-methylbutyrate free acid reduces markers of exercise-induced muscle damage and improves recovery in resistance-trained men
The study didn’t test if muscle damage causes more protein breakdown—it tested if a supplement (HMB-FA) helps reduce damage and recovery time. So it doesn’t prove the claim, even though it’s related.
The study found that even when muscles aren’t damaged by exercise, they still grow just as well — meaning muscle damage doesn’t slow down recovery or stop muscle growth like the claim says.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.