Development and Assessment of Animal Model of Persistent Muscle Pain. |
Sohn, Min Kyun , Lee, Ku Young , Yang, Shin Seung , Lee, Sheng Huo , Kim, Sang Soo |
epartment of Rehabilitation Medicine, Chungnam National University, College of Medicine, Korea. 290aa@hanmail.net |
지속적 근육통증의 동물모델 개발과 평가 |
손민균, 이구영, 양신승, 이승활, 김상수 |
충남대학교 의과대학 재활의학교실 |
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Abstract |
Objective The purposes of this study were the development and assessment of an animal model of persistent muscle pain induced by repeated intramuscular injections of low pH buffered saline. Method Buffered saline at pH 4, 6 or 7.2 were injected twice, 3 days apart, into the gastrocnemius muscles of thirty Sprague-Dawley rats. To quantify hyperalgesia, paw withdrawal response to von Frey filament (mechanical hyperalgesia) and acetone (cold hyperalgesia) were measured for the 4 weeks after injection. Also the locomotor performance with inclined plane board and treadmill, and electrophys iologic study were evaluated.
Results Mechanical hyperalgesia that was produced by the single injection of saline lasted less than 24 hours. The repeated injection of acidic saline produced mechanical hyperalgesia for more than 4 weeks at injected side and 3 weeks at contralateral side. Cold hyperalgesia lasted for 1 week after injection bilaterally. The locomotor performance and nerve conduction studies were not changed after injec tion.
Conclusion We have developed and characterized a model of muscular pain that was long lasting and widespread. This might prove useful for studying pain of muscular origin that may be similar to the chronic pain syndromes observed clinically.
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Key Words:
Persistent muscle pain, Acidic saline, Animal model |
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