Analgesia following exercise: a review

Area of Science:

• Exercise science
• Pain research
• Neuroscience

Background:

• Over 20 years of research has investigated exercise-induced analgesia.
• Running, cycling, and swimming are common exercise modalities studied.
• Pain thresholds and tolerance increase post-exercise, with pain intensity ratings decreasing.

Purpose of the Study:

• To review existing literature on exercise-induced analgesia.
• To examine different exercise types and pain stimuli.
• To explore the underlying mechanisms of exercise-induced analgesia.

Main Methods:

• Review of human and animal research on exercise and pain.
• Analysis of studies using various pain stimuli (electrical, pressure, temperature).
• Examination of findings related to resistance and isometric exercise.

Main Results:

• Exercise consistently increases pain thresholds and tolerance.
• Analgesia is more reliably observed with electrical or pressure pain stimuli compared to temperature.
• Limited evidence suggests analgesia from resistance and isometric exercise.

Conclusions:

• Exercise-induced analgesia is a well-documented phenomenon.
• Mechanisms are not fully understood but likely involve multiple systems (opioid and non-opioid).
• Exercise characteristics influence the activation of specific analgesic pathways.