The endogenous euphoric reward system that reinforces physical training: a mechanism for mankind's survival.
Sher
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D000339:Affect / Q000502:physiology; D005059:Euphoria / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008960:Models, Psychological; D018847:Opioid Peptides / Q000502:physiology; D012201:Reward
D018847:Opioid Peptides