During long distance running, many people note a sense of excitement and even euphoria. The researchers compared this effect with the use of marijuana. You know, the drug reduces pain and improves mood.

Experts from Oxford University conducted an experiment with laboratory mice. While running in animals increased the level of beta-endorphins (happiness hormones similar to the action of morphine). Choose beta-endorphins are quite large and cannot penetrate the brain barrier, writes The Daily Mail.

Therefore, scientists have suggested that euphoria while running is associated with activation of role of cannabinoid receptors. They increase the appetite, affect the pain threshold, alter mood. Beta-endorphins, the study found, are synthesized during running and help the animals to cope with physical stress.

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