MTorrice writes: After a nice long bout of aerobic exercise, some people experience what's known as a "runner's high" — a feeling of euphoria coupled with reduced anxiety and a lessened ability to feel pain. For decades, scientists have associated this phenomenon with an increased level in the blood of beta-endorphins, which are opioid peptides thought to elevate mood. Now, German researchers have shown the brain's endocannabinoid system—the same one affected by marijuana's 9-tetrahydrocannabinol (THC)—may also play a role in producing runner's high, at least in mice.
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