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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If it is warmer you need to pump more blood to the skin to lose the heat your body produces. How much the temperature of the blood drops when it flows in your skin depends on the temperature difference between your body and the surroundings.
At the same time, you need to transport blood to the muscles to provide oxygen. Muscles can cheat and get energy without oxygen, then Lactic acid is produced, But to a higher level makes the muscles harder to move and too much would kill you. You get rid of it with oxygen, this is why not ned to breathe a lot directly after hard work, you need oxygen to remove the Lactic acid.
The heart has a limited pumping capacity and it is want in many ways limits your performance. If you are at max heart capacity you get less blood to the muscles compared to in colder weather. It results in the low sustained energy output of being reduced.
If you are not at max capacity you can still supply all oxygen to the muscles but the heart needs to work harder than in cold weather because of the extra flow to the skin.
If you work above sustainable capacity the Lactic acid will build up faster in warm weather.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2375553/
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