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OpenStudy (kyanthedoodle):

How can too much coffee increase your heart rate?

OpenStudy (anonymous):

Because having caffeine excites your nervous system, it can put more pressure on your heart to keep up with this stimulated body state. As this happens, your heart rate may speed up to accommodate the extra work your body is doing. Having a rapid heart rate can be dangerous, especially for those who have a heart condition or suffer from irregular heart rhythms.

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