International Journal of Morphology
versión On-line ISSN 0717-9502
PACHIONI, Célia Aparecida Stellutti et al. Stretch Injuries of Skeletal Muscles: Experimental Study in Rats' Soleus Muscle. Int. J. Morphol. [online]. 2009, vol.27, n.4, pp. 1139-1146. ISSN 0717-9502. http://dx.doi.org/10.4067/S0717-95022009000400029.
The study aimed to verify the physiological injury behavior by stretching the soleus muscle of rats, using a noninvasive experimental model. Twenty-four rats were used and divided into three groups of eight animals: control group (A), group that performed tetanus followed by electrical stimulation and a sudden dorsiflexion of the left paw performed by a device equipped with a mechanism of muscle soleus rapid stretching (B); and a group that only received the tetanus (C). Three days later, the animals were killed, and the soleus muscle was resected and divided into three segments. Morphological changes indicative of muscle damage appeared in all three segments of group B. In a lesser degree, similar changes were also detected in muscles subjected to only tetanus. This model was effective; reproducing an injury similar to what occurs in human sports injuries.
Palabras clave : Disease models; Animal; Rats; Skeletal muscle; Tetany.