Characteristics of surface electromyography and peak torque of knee extension and flexion in athletes with patellar tendinopathy
10.3969/j.issn.1673-8225.2012.02.026
- VernacularTitle:髌腱末端病运动员膝关节屈伸峰力矩和表面肌电图的特征
- Author:
Chunlin YUE
;
Guoxiang WANG
;
Wenjun WANG
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2012;16(2):303-306
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND: Patellar tendinopathy is tiny damage at tendon insertion. Changes in the strength balance between vastus medialis and vastus lateralis in the quadriceps may lead to patellar abnormal motion, even an impact to the tendon insertion. OBJECTIVE: To analyze the mechanism and influence of patellar tendinopathy on the knee joint and surrounding muscles motion. METHODS: Ten male athletes with patellar tendinopathy and ten male athletes with matched sports item, body height and age were selected, and the knee-joint strength and surface electromyography were tested using CON-TREX Isokinetic Measurement System. The change of knee-joint flexor peak torque, extensor peak torque and surface electromyography of the quadriceps were compared with and analyzed. RESULTS AND CONCLUSION: Result showed during isometric exercise, extensor peak torque of the patellar tendinopathy group was significantly lower than the control group, and ratio of flexor peak torque to extensor peak torque was significantly higher than the control group; during isokinetic exercise, extensor peak torque of the patellar tendinopathy group was significant smaller than that of the control group, and notably changed with the increasing motion angular velocity; during isometric exercise and isokinetic exercise, the ratios of vastus medialis/vastus lateralis of the patellar tendinopathy group were lower than that of the control group. There were significant differences between knee-joint flexor and extensor of patellar tendinopathy athlete. The activity of vastus lateralis is low and vastus medialis and vastus lateralis are not in balance.
