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Trick question.

Adrenaline (or epinephrine) will constrict the blood vessels and increase the heart rate to also increase cardiac output. That being said, there is no relationship between increase bloodflow/heart rate and improved athletic performance, so you probably wouldn't be able to run any faster than you could before, owing to your established level of current conditioning.

Adrenaline might not make you faster but some of your bodys safety mechanisms can turn off when in danger allowing you to use more of your muscle fibres which makes you stronger and faster! If these safety mechanisms werent there you could tear muscles, ligaments and tendons easily.

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14y ago
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Q: How much faster can you run with adrenaline?
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