Exercise-Induced Hypoalgesia and Pain Modulation

Exercise-induced hypoalgesia (EIH) describes the transient reduction in pain sensitivity that follows acute or chronic bouts of physical activity. Underpinned by activation of endogenous descending inhibitory pathways, EIH reflects interplay between central and peripheral mechanisms. At the spinal level, engagement of opioid and non-opioid peptides modulates nociceptive transmission, while supraspinal centres including the periaqueductal grey and rostral ventromedial medulla enhance inhibitory outflow. Serotonergic, endocannabinoid and monoaminergic systems further contribute to analgesic responses. Modality, intensity and duration of exercise shape the magnitude and duration of hypoalgesia, as does individual fitness, age and psychological state. Globally, EIH holds promise as a non-pharmacological adjunct in acute and chronic pain management, with potential to reduce reliance on medication, improve function and quality of life.

Research from Nature Portfolio

A recent large-scale cross-sectional survey has highlighted the psychological pathways linking exercise habits to pain reduction. In a cohort of over 50 000 adults, high-frequency exercise was associated with lower self-reported pain intensity across low back, neck and knee pain subgroups. Mediation analysis revealed that psychological factors—specifically reduced negative affect and increased vigour—fully mediated the relationship between exercise frequency and pain, exhibiting a dose-dependent pattern. These associations were robust across age strata and pain locations, emphasising the role of affective components in exercise-induced hypoalgesia.

Exercise-Induced Hypoalgesia and Pain Modulation publication trend

The graph below shows the total number of articles in exercise-induced hypoalgesia and pain modulation across all publications each year (not limited to Nature Index journals).

Technical terms

Exercise-induced hypoalgesia (EIH): A reduction in pain sensitivity following acute or repeated exercise.

Central sensitisation: Amplification of neural signalling within the central nervous system, leading to heightened pain sensitivity.

Descending pain modulation: Neural pathways from the brain that inhibit or facilitate spinal nociceptive transmission.

Quantitative sensory testing (QST): Psychophysical methods to assess sensory and pain thresholds using controlled stimuli.

Endogenous opioids: Naturally occurring peptides (e.g. endorphins) that bind to opioid receptors, modulating pain.

Serotonergic mechanisms: Neural processes involving serotonin that contribute to pain inhibition and mood regulation.

References

1. Exercise effect on pain is associated with negative and positive affective components: A large-scale internet-based cross-sectional study in Japan. Scientific Reports (2024).
2. Comparative effectiveness of various exercise interventions on central sensitisation indices: A systematic review and network meta-analysis. Annals of Physical and Rehabilitation Medicine (2025).
3. Does aerobic exercise effect pain sensitisation in individuals with musculoskeletal pain? A systematic review. BMC Musculoskeletal Disorders (2022).
4. Exercise-induced hypoalgesia after acute and regular exercise: experimental and clinical manifestations and possible mechanisms in individuals with and without pain. PAIN Reports (2020).