Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: Post-Respiratory Illness - Cardio -- persistent elevated heart rateI have been sick with a respiratory illness for several weeks. I tested negative for the flu, the doc didn't think it was COVID-19 and would not test me. I have been on several antibiotics and I take the last dose tomorrow. It was mostly chest tightness and inflammation. I felt better today so I went for a run. I shortened the distance and intensity by half.About an hour after my run, my heart rate spiked to 99 bpm and my hands began trembling . It's varied this evening between 80-120 bpm all night at rest. My baseline is around 66 bpm. I have tested my temperature several times - no fever.Could this be something serious? It has me a bit concerned. Thank you41M5"10180 lbsSmoke (occasionally)Duration - 6 hours. ### Response: No way for us on here to tell you wholeheartedly whether this is serious or not. If it is bothering you then it is serious. Does this typically happen when you run? Cause I know for a fact when I run my heart rate shoots up as well. Very normal for this during physical activity. I would recommend stopping smoking if you are worried of respiratory illness..