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Answer:
When heart rate or rhythm changes are minor
Your heart rate or rhythm can change when you are under stress or having pain. Your heart may beat faster when you have an illness or a fever. Hard physical exercise usually increases your heart rate, which can sometimes cause changes in your heart rhythm.
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That would be cardio work
You have<span> erythrocytosis if </span>your Red Blood count is higher<span> than normal. This may be due to: cigarette smoking. ... polycythemia vera, a bone marrow disease that causes overproduction of </span>RBCs <span>and </span>is<span> associated with a genetic mutation.</span>