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.

Pro

Against

Evidence from Studies

Supporting (1)

Community contributions welcome

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

Contradicting (0)

Community contributions welcome

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.

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

Similar Assertions

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

84%

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

83%

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

80%

If a guy new to lifting weights gets a bigger muscle swell right after his first workout, he’s likely to gain more muscle over the next 6 weeks.

79%

Checking your muscle size right after a workout won’t tell you how good your workout was — it’ll look normal by the next day no matter how hard you went.

76%