When trained men do strength exercises, their muscles get about 13.5% bigger right after because they fill with fluid. Certain workout styles make this happen more than others.

33

Pro

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Against

Evidence from Studies

Supporting (1)

33

Community contributions welcome

33

Repeated Bouts of Advanced Strength Training Techniques: Effects on Volume Load, Metabolic Responses, and Muscle Activation in Trained Individuals

Cross-Sectional Study

Human

2019 Jan 6

The study looked at muscle swelling after strength training in trained men and found it increased right after exercise, which matches the claim, but it didn't give the exact 13.5% number or compare techniques in detail.

Contradicting (0)

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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

Repeated Bouts of Advanced Strength Training Techniques: Effects on Volume Load, Metabolic Responses, and Muscle Activation in Trained Individuals

Score: 33

DOI: 10.3390/sports7010014

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Your muscles can actually swell up bigger right after just one workout than they do after training consistently for several weeks.

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Acute muscle swelling responses following a single resistance training session are not representative of swelling responses observed after prolonged, repeated training programs.

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When you first start lifting weights, your muscles might look bigger right away—but that’s mostly because they’re swollen from tiny tears and fluid buildup, not because they’re actually growing stronger or larger for good.

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