Introduction: Ankle sprains are common injuries in physically active populations. Up to 75% of individuals who suffer a lateral ankle sprain may develop chronic ankle instability (CAI). CAI including alterations in sensorimotor function that to cause deficits in postural control and deviations in gait and. However, chronic ankle instability is common sequelae of lateral ankle sprain That it to challenge activities such as walking and gait initiation(GI). GI is the transition from a stable stance to a stable state of walking. However, research has been show that individuals with CAI have demonstrated in gait initiation Compared with healthy subjects.. Although GI impairments have been identified in individuals with CAI, but, research in this field is contradictory and limited. Therefore, this study aimed to compare the difference of between Center of Pressure and Center of mass in Gait initiation in young Tekowando Female with and without chronic ankle instability.
Methodology: Subjects of this semi-experimental research included 10 athletes with CAI and 10 healthy athletes with an average age: (healthy: 20.44±1.94, CAI: 19.22±2.99 years), height: (healthy: 168.33±8.42, CAI: 167.88±4.88 centimeters), weight: (healthy: 57.11±9.49 CAI: 56.44±11.72 kilograms) volunteered. Participants performed barefoot GI on two force plate(model kistler) in five trial. The averages of 5 trials were used for analyses. Data kinetic were recorded with a frequency of 1200 Hz. The GI profile was separated into three phases (RT, APA و CPA). Data analysis done in data software. In this study, Kolmogorov-Smirnov test was used to test the normal distribution of data and dependent t-test was used to compare means (=α0.05).
Results: the results showed that chronic ankle instability leads to increasing of differences in shifting the center of mass and center of pressure in the direction of mediolateral(M.L) (p=0.01) in phase CPA, between the two groups
Discussion: The results of this study suggest that chronic ankle instability to causes alterations in profile gait initiation in individuals with CAI and this individuals have demonstrated deviations in gait initiation (GI) compared to healthy individuals. GI may be a challenging task to evoke deficits in postural control in individuals with CAI. The GI likely remains affected by the development of CAI.