mechanistic
Strong Support
Even though muscle fibers get 23% bigger with high-rep training, the amount of actin protein inside doesn’t go up, and the usual tight link between fiber size and actin breaks down.
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0
Evidence from Studies
Supporting (1)
39
Community contributions welcome
39
The study found that muscles got bigger after training, but the amount of actin (a key muscle protein) didn’t increase—it even went down—meaning the growth wasn’t from more contractile proteins. This matches the claim.
Contradicting (0)
0
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No contradicting evidence found
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.