Hip abductor (ABD) and adductor (ADD) muscle imbalances lead to injuries in lumbo-pelvic hip complex, and these imbalances and other factors such as foot posture might affect dynamic balance. The present study aims to examine body mass index (BMI), dynamic balance and hip muscle strength values of adolescents with different foot posture alteration. Fifty-nine healthy adolescents (mean age 12±3 years, height 156±11.46 cm, weight 50.57±11.60 kg) voluntarily participated in the study. The participants were divided into two groups according to Foot Posture Index (FPI): (Neutral Foot Group (NFG), n=48 / Prone Foot Group (PFG), n=11). The participants’ single leg – both legs dynamic balance values were measured by using balance measurement device (TOGUtm), and their hip ABD and ADD isometric muscle strengths were measured through the load cell. The dynamic balance, BMI and muscle strength values of the groups were compared by using Independent Sample t-Test. A statistically significant difference was found between the groups according to right and left single leg dynamic balance values (p<0.05). The study revealed that one of the most significant factors affecting dynamic balance in adolescents is foot posture. It is believed that using insoles suitable for the foot posture might be helpful in increasing the efficiency of dynamic movements carried out on a single leg and it is essential to suggest some exercises to correct foot postures when necessary.
This study aimed to explore the differences in the distributions of plantar pressure in dynamic states and assess the strength profiles in the hip muscle of professional volleyball players according to foot posture index. Dynamic plantar pressure distributions were evaluated via the Pedar®-X plantar pressure insole during walking. Load Cell sensors were used isometrically to measure hip adductor/abductor muscle strength. Independent-Samples t-Test was performed according to Levene's homogeneity test results. Pearson correlation coefficient was performed to understand the relationship between the variables. For these measurements, significance level was set as p<0.05. The right adductor and right abductor strength of the prone group had significantly lower than the neutral group (p <.05). Similarly, the left adductor strength of the prone group had significantly lower than the neutral group (p <.05). Also, plantar pressure distributions of volleyball players with prone feet were distributed evenly across metatarsal bones, but highly uniformly on the 1st, 2nd and 3rd metatarsal head and midfoot regions in dynamic walking. Results between the neutral and prone foot posture group found a moderate negative relationship (r = -.570; -,529) between both right and left adductor hip strength and foot posture. Finally, in right and left abductor hip strength to foot posture a low negative relationship was found (r = -.471; -375). Reduced strength of the hip abductor relative to the adductor is associated with increased pronation at the foot. Furthermore, the decrease in arch height increased the risk of lower extremity injuries related to excessive use, including patellofemoral pain syndrome and medial tibial stress syndrome, as well as may have a negative effect on jumping performance.
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