There are two parts to the human nervous system, the voluntary nervous system and the autonomic nervous system. However, the degree of activation of the sympathetic response is dictated by the degree of stress the body perceives itself to be in. Both are necessary for aerobic exercise to proceed. The release of these hormones activates what is known as the ‘flight or fight’ response. What happens, physiologically, is that your body’s sympathetic response is triggered, and hormones, specifically norepinephrine and epinephrine, are released in large amounts. When you submit your body to an extreme stressful workout of any kind, you get an adrenaline rush, your heart rate goes up beyond normal, you start sweating excessively, you could encounter muscle burn, and your blood pressure shoots up.
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