eli5: what is the difference between putting heat vs cold on muscles?
In: 2
Heat causes blood vessels to expand increasing blood flow to the area.
Cold causes blood vessels to contract reducing blood flow.
If you have an injury with swelling cold is beneficial because it reduces fluid in the injured area which helps to reduce pain.
If you have stiff muscles or joints heat helps the muscles to relax as well as promotes increased blood flow.
The typical advice is to alternate the two at 15-20 minute intervals.
A cloth or towel should be placed between a heat or cold pack and bare skin to avoid burns or frostbite.
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