When muscles get bigger over time, it’s not because the non-working parts inside them swell up—it’s because the actual muscle fibers that do the work grow more, and that’s what really matters for lasting muscle growth.

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Evidence from Studies

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Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions

Narrative Review

2025 Nov 21

This study says that muscles don’t get bigger just from swelling or extra fluid inside them — they grow because the actual muscle fibers get stronger and thicker, which matches what the claim says.

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No contradicting evidence found

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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.

Source Study

Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions

Score: 1

DOI: 10.1016/j.jshs.2025.101104

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