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I've seen somewhere that training with really high repetitions forces the body to build new capillaries and veins, is it true?

  • Not sure if high volume training starts showing your veins. But regarding this acc. to the question: forces the body to build new capillaries and veins No, body can't do that for sure! – Madhurjya Jun 25 at 10:58
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Based on available research, it looks like a variety of exersizes promote capillary and vein growth - especially high repetition training:

https://journals.physiology.org/doi/full/10.1152/ajpheart.1999.276.2.h679 https://irispublishers.com/ojcr/pdf/OJCR.MS.ID.000574.pdf

Physiologically, this might be because shorter 'power' exercises don't rely as much on the vascular system, while longer 'repetition' exercises require a steady source of energy. The body adapts to what it thinks it will need in the future.

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