COMBINED EFFECTS OF OXANDROLONE AND EXERCISE ON MUSCLE RECOVERY IN RATS WITH SEVERE BURN AND HINDLIMB UNLOADING
Alen Palackic, Amina El Ayadi1, Charles E Wade2
1Department of Surgery, University of Texas Medical Branch, Galveston, Texas.
Shock (Augusta, Ga.)
|January 3, 2025
Summary
Exercise and oxandrolone (anabolic steroid) independently improve muscle function after severe burns. Combined treatment enhanced protein synthesis signaling pathways in a rodent model, aiding muscle recovery.
Area of Science:
- Biomedical Engineering
- Muscle Physiology
- Burn Injury Research
Background:
- Severe burns cause significant muscle mass and strength loss, impairing patient function.
- Previous studies indicate exercise and oxandrolone individually benefit muscle in burn patients.
- Investigating combined therapies is crucial for improving recovery outcomes.
Purpose of the Study:
- To evaluate the combined effect of oxandrolone and resistance exercise on muscle atrophy.
- To investigate protein synthesis and mitochondrial biogenesis pathways.
- To assess muscle function recovery in a burn-induced hindlimb suspension model.
Main Methods:
- Rodent model of severe burn (40% TBSA) with hindlimb unloading.
- Groups: Vehicle/No Exercise, Oxandrolone/No Exercise, Vehicle/Exercise, Oxandrolone/Exercise.
- Muscle force, fatigue, and Western blot analysis of signaling pathways.
Main Results:
- Exercise significantly increased plantaris muscle tetanic force.
- Exercise improved soleus muscle fatigue index and integration; oxandrolone alone did not.
- Combined oxandrolone and exercise elevated Raptor and p-Akt levels, indicating increased protein synthesis.
Conclusions:
- Oxandrolone and resistance exercise independently enhance muscle function recovery post-burn.
- Combined treatment potentiates protein synthesis signaling pathways.
- This study provides insights into therapeutic strategies for burn-related muscle wasting.
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