German study: Runner's high triggers the same part of the brain as marijuana

Most people who run or work out regularly have experienced ‘runner’s high’.

It describes a feeling of euphoria after exercising, which is often combined with decreased anxiety and a higher tolerance to pain.

Now a new study has found it also provides a similar effect to smoking marijuana by triggering the brain’s cannabinoid receptors to relieve pain. 

The study, led by the University of Hamburg and the University of Heidelberg, studied cannabinoid receptors in mice after running.

Previous research has suggested that runner’s high is caused by raised levels of beta-endorphins, which triggers the same effects as morphine.

But in their paper published in Proceedings of the National Academy of Sciences, the researchers detail how these endorphins are too big to get through the blood-brain barrier.

Instead, they say runner’s high is more likely to be linked with cannabinoid receptors in the brain.

These receptors are involved in a...

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