The term "endorphin rush" has been adopted in
popular speech to refer to feelings of exhilaration brought on by pain, danger,
or other forms of stress, supposedly due to the influence of
endorphins. When a nerve impulse reaches the spinal cord, endorphins that
prevent nerve cells from releasing more pain signals are released. Immediately
after injury, endorphins allow animals to feel a sense of power and control
over themselves that allows them to persist with activity for an extended time.
A publicized effect of endorphin production is the so-called "runner's
high", which is said to occur when strenuous exercise takes a person over
a threshold that activates endorphin production. Endorphins are released during
long, continuous workouts, when the level of intensity is between moderate and
high, and breathing is difficult. This also corresponds with the time that
muscles use up their stored glycogen. During a release of endorphins, the
person may be exposed to bodily harm from strenuous bodily functions after
going past his or her body's physical limit. This means that runners can keep
running despite pain, continuously surpassing what they otherwise would
consider to be their limit. Runner's high has also been known to create
feelings of euphoria and happiness.Listen song here:YouTube
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