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assertion
Analysis v1
Strong Support

After a hard workout, your muscles swell up temporarily because they get slightly damaged.

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Evidence from Studies

Supporting (2)

46

Community contributions welcome

46

Comparison of the recovery response from high-intensity and high-volume resistance exercise in trained men

Randomized Controlled Trial
Human
2017 Jul

Heavy weightlifting causes tiny tears in muscles, which triggers swelling and inflammation as the body repairs them—this study found those signs after intense workouts, especially with lots of reps.

30

Recovery after Heavy Resistance Exercise and Skeletal Muscle Androgen Receptor and Insulin-Like Growth Factor-I Isoform Expression in Strength Trained Men

Cohort Study
Human
2011 Mar

After heavy weightlifting, the muscles swelled up, hurt more, and showed signs of tiny tears — all signs that the body is reacting to the stress by sending in fluids and repair tools, just like the claim says.

Contradicting (0)

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No contradicting evidence found

Similar Assertions

After a heavy leg workout, the thigh muscles get noticeably thicker due to swelling, and this lasts for at least two days.

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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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Muscle swelling induced by resistance training may persist for up to 72 hours post-exercise, potentially confounding hypertrophy measurements if assessed within this window.

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Repeated exposure to resistance training induces the repeated bout effect, leading to reduced muscle damage, inflammation, and swelling over time.

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Just because your muscles hurt or swell after lifting weights doesn’t mean that’s what’s making them grow—you can still get stronger and bigger even if you don’t feel sore or inflamed.

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