It does seem like getting the booster correlates with elevated heart rates.
Was back at Judo yesterday, and felt I had to slow down; my heart was beating mad quick. Friends seem to agree — one started running 2 weeks after, and saw a highly elevated heart rate, so she stopped.
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I wonder if this is an immune system thing, or a booster specific thing, or what — perhaps returning to exercise after a bout of fever feels the same way?
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Update: went to the gym yesterday and today; everything seems back to normal again.