Effect of pes planus on some kinetic parameters in trained young women
Poster Presentation XML
1Phd student in Physical Education & Sport Science. Sports Biomechanics. Kharazmi University
2Associate Professor, Physical Education & Sport Science, Kharazmi University
Introduction: The aim of this study was effect of decrease Height longitudinal arch on some kinetics parameters in landing- jumping- landing skill. Considering the importance of the role of healthy sole of the foot with natural anatomic archs in order to absorb shock and optimum transfer of force, the drop in the height of the inner longitudinal arch faces the whole body with abnormal stresses, which can be a factor in causing problems and mechanical changes of the movement.
Methodology: 28 young trained women (14 person with normal foot, 14 person with pes planus), volunteered to participate in this study. They landing from 50cm height on force plate then jumping and landing on second force plat. Coordinates of retro-reflexive markers were sampled at 200 Hz with an eight-camera optical motion capture system. Ground reaction force values were sampled synchronously at 1000 Hz with the use of two force platforms embedded in the lab surface. Cameras positioned around the two force plates captured the participants’ landing _ jumping_ landing task. Descriptive statistic and impaired t sample test was used to analyse data. Level of significance was considered 0.05.
Results: Results showed significant difference in some parameters. GRF on first landing was 7.12 times the body weight in subjects with flat foot. While in normal foot subjects it was 6.13 times the body weight. While on the second landing on the force plate, the peak force applied to flat foot subjects was 2.61 times that of body weight and in normal feet was 2.46 times that of body weight, which was statistically significant it was not meaningful.
Discussion: This systematic study has identified pes planus in trained young women that effect on kinetics. That show pes planus is parameter that case decrease in ability to landing- jumping skill, even in trained women. Of course, these differences were observed only in plyometric activities. On the first landing, which was the intensity, moment and velocity, the effect of ground force was significantly different between the two groups of flat foot and normal foot. But in the second landing, which was less intense, the reaction forces did not differ significantly. These results indicate that increasing the response forces of the ground in flat-footed individuals can only lead to plenty of severe plyometric activities and cannot play a role in everyday activities.