I’ll always take aggregated and/or randomized data over anecdotal, but I still question whether or not a particularly hard effort can put one at risk for a cold/flu.
I’ve been training for the IMAZ 70.3, increasing my long runs. Yesterday, I did a 56 mile bike, followed by a 10k run. The run was brutal, as my fitness is not where i want it to be, and it was already 95 degrees (Tucson, AZ). I ended up walk/jogging the second half of it, and would have called my wife to pick me up, except I was too far away. So I pushed through the “bonk”. I say bonk… i was hot, i hadn’t planned my electrolytes properly, didn’t fuel properly on the bike, and the water I was drinking from my camelback was basically at 95 degrees and messing with my gut, so I probably didn’t drink enough. Walking downhill, my HR didn’t get below high zone 3. My last mile and a half was just misery.
Anway, today I’m sick. I’ve got either a head cold, or an allergy flare-up, or both. (Probably not COVID, though that’s lower on the possibilities.)
Someone please talk me out of this anecdotal event and point me back to the research that shows these events are correlated by time, not cause/effect.