Coordination and coordination variability of lower extremity in running forward versus lateral running
Oral Presentation XML
Paper ID : 1737-11THCONF
1biomesical engineering department, Amirkabir university of technology
2Associated professor, BME department, university of technology, Hafez street, Tehran, Iran
Introduction: Coordination of movement defined as using redundant degree of freedom in suitable times and orders for execution of a certain task.There is different methods to evaluate coordination of movements such as coding technique, cross-correlation method, discrete and continues relative phase. It has been shown that coordination could be changed by changing task constraints. Also, it is shown that direction of movement could effect on dynamic characteristics of movement. The aim of this study was to evaluate if direction of movement could change coordination and coordination variability.
Methodology: Eight football players (30±3.2yrs, 74±3.6kg, 173±3.8cm) participated in this study. They performed running in both direction with adequate rest time in 10 meters path. Four Isoinertial Measurement Units (IMU) attached to thigh and shank of subjects in both side during tests. Three dimensional orientation of each IMU were measured by Kalman filter method. The ensemble curves were calculated by averaged time normalized angles during cycles of each movement. Continues Relative Phase (CRP) method was used to evaluation of coordination between shanks and thighs during both forward and lateral running. The ensemble curves were used for CRP calculation. Mean Absolute Relative Phase (MARP) and (DP) were used to evaluate of coordination and coordination variability, respectively. Statistical method was one way ANOVA repeated measure analysis (p<0.05).
Results: For comparing running in two different directions CRP, MARP and DP of each side and in three planes was calculated. Statistical analysis of MARPs showed that there is no significant difference between sides and directions of running. But MARPs in different planes are significantly different. DP values showed same results in statistical analysis. This means significant difference in DP and MARP values just caused by plane of movement. Side of body and direction of running could not cause any significant difference in these values.
Discussion: Results demonstrate that coordination and coordination variability of shank and thigh are different in three planes. But there is no difference between these values in forward and lateral running. Also right and left side pairs of shank and thigh has not any difference in coordination and coordination variability. Results are in line with, which is shown that coordination and coordination variability in different plane were not same. But in contrast with results could not show any difference caused by direction of running in these values.