mechanistic
Analysis v1
Strong Support
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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Evidence from Studies
Supporting (1)
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Community contributions welcome
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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 JanThe study found that all three types of exercise increase the number of capillaries per muscle fiber about the same, but only endurance training significantly boosts capillary density because it causes less muscle growth.
Contradicting (0)
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No contradicting evidence found
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