Related Experiment Video
Updated: Jul 4, 2026

Assessment of Knee Hyperalgesia in Mice using Pressure Application Measurement
Published on: June 13, 2025
Exercise-induced hypoalgesia in healthy males is best explained by mechanisms selectively affecting deep-tissue pain
Vladimir Aron1, Thomas Graven-Nielsen2, Louise Deldicque1
1Institute of Neuroscience (IoNS), UCLouvain, Belgium.
Background:
The mechanisms driving the transient reduction in pain sensitivity following a single bout of physical exercise-a phenomenon known as exercise-induced hypoalgesia (EIH)-remain unclear despite proposed contributions from central and peripheral processes. So far it is unknown whether EIH selectively modulates the perception of specific types of nociceptive stimuli and whether this modulation is confined to exercising limbs or generalized to the entire body.
Methods:
In 38 healthy males (18-30 years) the effects of a single session of moderate/high-intensity cycling exercise (25 min at 75% of the heart rate reserve) were assessed against a control condition (25 min of light cycling exercise) on the sensitivity to stimuli preferentially activating skin mechano- and heat-sensitive nociceptors versus deep-tissue nociceptors, applied to the exercising lower limbs versus the non-exercising upper limbs. Pressure pain thresholds (PPT), heat pain thresholds (HPT), cold detection thresholds (CDT), and mechanical pinprick ratings (PP), as well as auditory detection thresholds (ADT) serving as control, were recorded before and immediately after the exercise and control conditions.
Results:
Linear mixed models revealed that exercise increased the PPT selectively at the exercising limb. No significant effects of exercise were found for other types of stimuli, except for a reduction of CDT at the exercising limb, which was not significant when controlling for skin temperature.
Conclusions:
These findings suggest that processes preferentially modulating deep-tissue nociceptor sensitivity within exercising muscles contribute to EIH in young healthy males.
Related Concept Videos
Exercise and Cardiovascular Response
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Nociception
Exercise and Muscle Performance
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Analgesia and Pain Management