Comparison of changes in markers of muscle damage induced by eccentric exercise and ischemia/reperfusion.

To examine the effects of eccentric exercise (EE) and ischemia/reperfusion (I/R) on the markers of muscle damage, 72 rats were randomly assigned to the EE group, I/R group and control group (C), respectively. The rats in EE ran downhill on a treadmill with a 16 ° inclination at a constant speed for 90 min, and the rats in the I/R group underwent 90 min of four-limb ischemia, followed by 24, 48 and 72 h of reperfusion. Blood and tissue samples were collected immediately, 24, 48 and 72 h after exercise or reperfusion. Quantitative analyses showed that the I/R group had a significantly larger mitochondrial volume at 24 h after reperfusion compared with the C, and there were more disrupted Z-lines in the EE group and more disrupted mitochondria in the I/R group at 24 h after exercise or reperfusion. When compared with the C, a significantly lower total antioxidant capacity and higher interleukin-6 value were observed after exercise or reperfusion. Our data suggest that although EE and I/R result in some similar changes in the muscle damage markers, there are still some differences. The EE- and I/R-induced muscle damage may be due to different mechanisms.

[Applied study on MRI diagnosis of the oral and maxillofacial masses.].

38 cases of Oral and Maxillofacial masses were selected to be studied by MRI,combined with fine neddle aspiration cytologic examination,compared with CT scan.The authors thought that MRI was clear,high resolving power of soft tissue,able to find out the bone infiltration of the Oral Maxillofacial masses and hemangioma or lymphoangioma etc,those which were suspected to invade the crania base,tip of orbit,pterygopalatine fossa,parapharyngeal,the vital blood vessel of the neck,primary study on MRI supervising local recur after the maxillofacial tumors being resected was also done.