Resistance Training Before Hyperalgesia Induction Promotes Analgesic Effects Through Central and Peripheral Biomarker...

Area of Science:

• Neuroscience
• Exercise Physiology
• Pain Research

Background:

• Fibromyalgia (FM) is a chronic pain condition with complex pathophysiology.
• Novel therapeutic strategies are needed for effective FM management.
• This study explores resistance training (RT) as a pre-emptive intervention.

Purpose of the Study:

• Investigate RT effects on pain sensitivity in an FM-like rat model.
• Analyze RT impact on skeletal muscle IL-6 and IL-10 expression.
• Assess RT influence on thalamic serotonin levels post-hyperalgesia induction.

Main Methods:

• Wistar rats underwent a 14-week RT protocol or served as controls.
• Hyperalgesia was induced using acid saline injection into the gastrocnemius muscle.
• Pain sensitivity, muscle IL-6/IL-10, and thalamic serotonin were measured.

Main Results:

• RT significantly increased paw withdrawal thresholds compared to non-RT controls.
• RT reduced IL-6 and IL-10 expression in skeletal muscle post-acid saline injection.
• Thalamic serotonin levels were elevated in RT groups after hyperalgesia induction.

Conclusions:

• Pre-emptive RT effectively prevented acid saline-induced mechanical hyperalgesia in rats.
• RT mitigated skeletal muscle inflammation by normalizing IL-6 and IL-10 levels.
• RT preserved thalamic serotonin expression, suggesting a neurochemical protective effect.