Effects on depression
A number of factors may contribute to depression including being overweight, low self-esteem, stress and anxiety.
Endorphins act as a natural pain reliever and antidepressant in the body.[citation needed] Endorphins have long been regarded as responsible for what is known as "runner's high", a euphoric feeling a person receives from intense physical exertion.
However, recent research indicates that anandamide may possibly play a greater role than endorphins in "runner's high". When a person exercises, levels of both circulating serotonin and endorphins are increased.
These levels are known to stay elevated even several days after exercise is discontinued, possibly contributing to improvement in mood, increased self-esteem, and weight management. Exercise alone is a potential prevention method and/or treatment for mild forms of depression.
Exercise also affects the sleep that a person will receive at night. When the body is physically exhausted it will slip into Rapid Eye Movement (REM) sleep easier and for a longer period
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