what is the actual mechanism that makes it harder to exercise in higher heat?

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Compared to jogging in high 60s/low 70s (F) with a slight breeze and partial clouds, jogging in mid-80s (F) no breeze full sun means a worse pace and also much harder struggle to get that worse pace.

When I google online, I get kinda very generic answers: “your body has to work harder to cool” “sweat is less effective” “extra stress on body”, etc but I don’t understand what the actual biomechanics are that make me less capable when I’m working out. Like, OK, if my body has to sweat more, how does that make my muscles less capable of pushing me through a 3-miler? What does the extra stress actually mean? What is actually getting stressed that prevents me from hitting my normal pace?

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edit: first time posting here and this sub does not disappoint, thanks for such quick responses!

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Anonymous 0 Comments

It’s not so much heat but the humidity. I lived in Canary Islands and running by the seaside was lovely but now that I live in Lombardia which has comparable humidity to London and the high temperature on top of that it took me a sec to readjust

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