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One mechanism for your increased heart rate
& low blood pressure is an orthostatic explanation. When you squatting and then stood up, your blood pressure dropped from the change in position. Low blood pressure triggers an increased heart rate to promote a better circulation of blood throughout your body. This is benign and does not need any followup. Just be aware that a sudden change in position can affect your blood pressure.
Another, less benign, explanation is that the could be a cardiac problem. You do not give me any other symptoms so this would be more difficult to assess at this point. The American Heart Association lists the warning signs for heart attacks as:
Chest Pain: Most heart attacks involve discomfort in the center of the chest that lasts more than a few minutes, or that goes away and comes back. It can feel like uncomfortable pressure, squeezing, fullness or pain.
Discomfort/Pain in other areas of the upper body: Symptoms can include pain or discomfort in one or both arms, the back, neck, jaw or stomach.
Shortness of breath
with or without chest pain.
Other signs may include breaking out in a cold
If you experience any of these symptoms, please call 9-1-1 for assistance.