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In addition to numbing the area to relieve pain, the cold will force fluids associated with swelling out of the region. Conversely, heat will draw fluid into the area to loosen the muscle and increase circulation. The alternating applications of heat and cold speeds healing and re-nourishment of the tissues, while at the same time purge the area of lactic acid which will help with fatigue and cramping.

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Q: What does ice do for muscles?
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