![]() This ability of the foot depends on the foot arch, which provides support from the passive system such as tendons and plantar fascia, as well as on contraction of the active system such as muscles. When walking, the foot alternates between being a flexible structure and being a rigid structure. ![]() Feet not only support body weight when maintaining a standing position or when walking, but they also maintain body balance against external shock ( Hedrick, 1996). The foot is sometimes called the second heart because it pumps blood up to heart ( Shin et al., 2008). With every step, the foot receives pressure that corresponds to approximately 80% of body weight. In the human body, the foot plays a deterministic role in that walking ability is necessary for conducting everyday activities ( Gouelle et al., 2016). Therefore, the interventions are necessary to improve the foot dysfunction and plantar fasciitis in people with flat foot. Based on the results, the group with flat foot may gradually generate potential of the foot dysfunction and plantar fasciitis. There were significant differences in dorsi-flexion of ankle ROM, FFI, dorsi-flexion and eversion of ankle strength, and the thickness of the plantar fascia between the two groups ( P<0.05). The inter- and intrarater reliability was excellent (ICC2,1=0.88, ICC3,1=0.93). Intraclass correlation coefficient (ICC) was used to verify the inter- and intrarater reliability of ultrasonography. Additionally, the thickness of the plantar fascia was measured using ultrasonography. The participants were measured the foot function index (FFI), range of motion (ROM) of ankle, and four-way ankle strength. ![]() They were divided into two groups of 26 according to the shape of foot with and without flat foot using the navicular drop test. All participants voluntarily agreed to participate in the study after hearing explanations about the purpose and process of the study. This study recruited 52 young adults (30 men and 22 women). Fifty-two participants were required for the present study design to achieve 80% power, 0.8 effect size (η2), and an alpha level of 0.05. This study investigated potential for foot dysfunction and plantar fasciitis according to the shape of the foot arch in young adults. ![]()
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