The involvement of the brain's opioid system in "runner's high" suggests one possible explanation for why endurance athletes have a much lower pain tolerance than do non-athletes.

Question

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Endurance athletes typically have a higher pain tolerance, not lower, due to adaptations in their body's response to prolonged physical activity, including the involvement of the brain's opioid system.

The Involvement of the Brain's Opioid System in "Runner's High