Ibuprofen Differentially Affects Supraspinatus Muscle and Tendon Adaptations to Exercise in a Rat Model

Area of Science:

• Musculoskeletal research
• Exercise physiology
• Pharmacology

Background:

• Previous research indicates ibuprofen may hinder tissue healing post-injury.
• The impact of ibuprofen on exercise-induced adaptations in healthy tissues remains debated.

Purpose of the Study:

• To investigate the effects of chronic ibuprofen administration on tendon and muscle adaptations to exercise in rats.
• To determine if ibuprofen interferes with exercise benefits in non-injured musculoskeletal tissues.

Main Methods:

• 167 male Sprague-Dawley rats were subjected to treadmill exercise or sedentary conditions for up to 8 weeks.
• Rats received ibuprofen or placebo, with supraspinatus tendons and muscles analyzed for mechanical, histological, and morphological properties.
• Both acute and chronic responses to ibuprofen and exercise were assessed.

Main Results:

• Chronic ibuprofen intake did not impair tendon mechanical properties or histological organization in response to exercise.
• Muscle fiber cross-sectional area in the supraspinatus significantly decreased with chronic ibuprofen use.
• Specific fiber type alterations were observed in muscles treated with ibuprofen.

Conclusions:

• Chronic ibuprofen administration does not negatively impact exercise-induced tendon adaptations but reduces muscle hypertrophy.
• This study highlights a potential risk of diminished muscle growth with long-term ibuprofen use during physical activity.