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Key terms: endorphins high pain release brain opioid levels studies body activity low produced running humans blood chemical morphine float anandamide dopamine physical bodily reported person acupuncture effects opioid receptor naloxone affinity possibly specific researchers capsaicin discovered themselves endogenous relaxation antagonist spinal cord isolation tank endorphin release strenuous exercise Search external links cited by footnotes on Wikipedia page Endorphin: |
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