The foot is the most end part of the body and plays a major role in body weight, and absorbing and adjustment of pressures resulting from the implementation of various skills such as walking and running. Any change in the musculoskeletal structure of the foot can lead to the formation of various abnormalities in the foot and cause many complications. Therefore, the aim of this study was to investigate the effects of six weeks of training of rope jumping on the static and dynamic balance and

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... tion time of female students who have flat feet. Methods: This study was done with aim of applied-comparative on 30 female school students in the fourth class who have flat feet at Ahvaz University in 2013 and 2014. They were were randomly assigned to two experimental and control groups, each of them had 15 subjects.Then, the experimental group trained for six weeks of rope jumping by defined protocol. To assess the static balance, balance errors assessment test (BESS), to assess the dynamic balance, star balanced test (SEBT), and to measure reaction time, Nelson ruler test were used. In addition, the data related for each test were measured in the pre and post-test. Finally, the data were analyzed using independent t-test and paired t test in SPSS software at 5% significance level. Results: The rope jumping training has impact on static and dynamic balance and reaction speed of female students with flat feet, it can also significantly increase their balance (reduces the number of errors in static balance test and enhances the achievement gap in the dynamic balance test), and it can improve the reaction time. (p <0/05). Conclusion: The results showed that the t-statistic is 2.046 for the static balance, 1.023 for dynamic balance, and 9.165 for reaction time, which it indicates a significant difference between before after exercises of rope jumping. INTRODUCTION The internal longitudinal arch of the foot is one of the most diverse bone structures of body divided based on its height to ground level. Reduction in the height of the internal longitudinal arch of the foot is known as flat feet resulted from some factors such as ligament relaxation, tibial torsion deformity, the presence sub-novicular bone, and presence of tarsal bone bridge (Norasteh 2010, Shojaeddin 2010, Asghari 2009, Mohammadi 2005, Mogaddam 2003). There are several problems in the presence of flat feet such as heel pain, bunion, hammer finger, leg splints, and backache (Asghari 2009, Najati 2012, Bronz 2005). Due to this fact that foot plays an important role in motion chain, in creating of balance, it holds whole weight of body firm in less level of reliance. Therefore, arches of the feet are very important (Mousavi et al., 1388).People with flat feet have different biomechanical movement than normal people. For example, these people have high pronation in the back of their, high plantar flexion in their ankle joint, and high flexion in the knee joint (Morley et al., 2009). In terms of muscle activity, inverter muscles of this group of people show high level of activity and their overture muscles show less level of activity than normal people. In addition, the plantar moment of flexion at the ankle of this group of people has led into loss of natural mechanical walking and increase of mechanical loads imposed on the structures of the lower limbs. Over time, additional mechanical loads resulted from internal longitudinal arch of the foot flat will transfer to higher areas such as knees, hips and lower back. Therefore, the flat feet are considered as an effective factor in many pathological conditions such as inflammation of pod of foot and patellofemoral pain (Chen et al, 2010).