فهرست نشریات علمی دسترسی آزاد ایران

Introduction: The importance of the surface on which a person moves has now been proven as a potential factor in the frequency and severity of lower limb injuries. The aim of the present study was to compare the electrical activities of lower limb’s muscles during landing on Different surfaces in elite volleyball players. Materials and Methods: This was Quasi-experimental causal-comparative study. Participants were 14 volleyball players between 18 and 20 years old. Electrical activity of four selected lower limb muscles was recorded by 8-channel electromyography according to the SENIAM protocol during landing on three surfaces of tatami, grass and sand. Results: Repeated measurement tests showed a significant difference between the peak of muscle activity in Vastus lateral is biceps femora’s muscles and during landing on tatami, grass and sand (P>0.05). However, the peak electrical activity during landing on different surfaces was significantly different in the tibia is anterior and gastrocnemius muscles (P=0.00). Also, there was no significant difference between knee and ankle joint’s contractions (P>0.05). In the knee and ankle joint’s, the highest and lowest mean contractions were observed on grass and sand, as well as tatami and sand, respectively. Conclusion: surfaces with higher stiffness are not the absolute factor to exert force applied to the muscles and joints. Conversely, a softer surface that reduces these forces and also reduces damage to bone elements.