Absolutely no problem whatsoever. Your heart is behaving perfectly normally. While sitting you are relaxing your muscles and your heart rate will be “relaxed”. As soon as you decide to get up you have to recruit and engage aThanksgiving Day Funny Gobble Til You Wobble T Shirt tee slew of muscles including your entire posterior chain to get you in the standing position. That requires blood flow to the muscles including some of the largest in your body, and that requires your heart to supply that blood. My heart rate might be below 50 when sitting relaxed. But it might spike up to 80 or 90 briefly as soon as I stand up. That’s a 40 bpm sudden spike. The reason some people get dizzy standing up is that blood is suddenly being needed for the muscles and the brain is temporarily short of blood. Maybe a faster spike in the heart rate might alleviate that dizziness. (Not that you have any control over how fast your hear responds to a demand).
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