Sheepdog Tip of the Day, During Combat tip 54
When your heart is pounding due to physical exertion, your face will usually be beet red, as every vessel dilates wide open to get blood to the muscles. But with a fear-induced heart rate increase, your face will usually turn white, due to vasoconstriction. If there are extreme physical demands placed upon the body at the same time that the vasoconstriction is occurring, then these two processes apparently work against each other to cause a skyrocketing heart rate.
Lt. Col. Dave Grossman, On Combat
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