The goal of this randomized crossover clinical trial is to investigate whether exercise-induced hypoalgesia (EIH) is influenced by circadian rhythm in healthy adults aged 18-40 years.
The main questions it aims to answer are:
* Does the time of day (morning vs. evening) influence changes in pain perception following exercise? * Do chronotype, sex, or stimulation site (bony vs. muscular) alter the magnitude of this effect?
Participants will:
* Complete questionnaires * Undergo quantitative sensory testing * Attend both morning and evening sessions in randomized crossover order
Healthy participants
age 18 to 40 years
good level of English that allow the enrolled participant to provide informed consent and complete the questionnaires provided
being categorized as "moderate" in the International Physical Activity Questionnaire (IPAQ)
inability to report pain intensity reliably
consumption of narcotics or tobacco products
regularly taking pain medications and analgesics
pregnant or planning to get pregnant