Does temperature affect our heart rate? If so why and how?

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Chmelski

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In Biology, we did an experiment where we went outside and moved at different speeds. e.g. walk, fast walk, jogging, running and sprinting, and then we measured our heart rate after each one. However when we were doing this, it was between 0-5 degrees outside. I was wondering if the temperature could affect our results and if it did then how? and if you can, I would like to know the biological reasons behind it all.
Thank you :)
 
Yep, like when the body is very cold, the heart has to work harder to warm the skin and maintain core heat.
The heart has to work harder when the body is excessively hot, also, because sweat takes energy like all other body functions take energy.
 
The flow of blood helps to regulate a body's temperature, in both extremes. Cooling when temperatures are high, and when muscles create heat in exercise, and heating when the ambient temperatures are relatively low.
 
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