When people who aren't very fit start exercising, their muscles grow new blood vessels quickly in the first month, but after that, even if they keep working out, they don’t get many more new blood vessels.

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Pro

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Against

Evidence from Studies

Supporting (1)

52

Community contributions welcome

52

Effects of Exercise Training on Mitochondrial and Capillary Growth in Human Skeletal Muscle: A Systematic Review and Meta-Regression

Systematic Review With Meta-Analysis

Human

2025 Jan

The study found that new blood vessel growth in muscles happens mostly in the first few weeks of exercise and then levels off, which 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.

Source Study

Effects of Exercise Training on Mitochondrial and Capillary Growth in Human Skeletal Muscle: A Systematic Review and Meta-Regression

Score: 52

DOI: 10.1007/s40279-024-02120-2

Similar Assertions

If you're just starting to get fit, different types of workouts like steady jogging, intense intervals, and all-out sprints all help grow similar numbers of tiny blood vessels per muscle fiber. But jogging-style workouts boost blood vessel density more because they don’t make your muscles grow as much, so the vessels aren’t stretched thinner.

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