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Introduction: High heel shoes alter the kinematics and muscle activity patterns of the lower extremities and spine. These changes in biomechanical characteristics of the body could be a challenging issue for postural stability system. The objective of this study was to investigate the effects of different heel heights on the postural sway of healthy young women. Materials and Methods: Thirty-two female students who aged 22.3 ± 1.4 year old volunteered in this randomized cross-over trial. The center of pressure parameters were recorded while participants stood upright on a forceplate in four random conditions: barefoot, with zero heel-height shoes, with 3 cm heel-height shoes, and with 6 cm heel-height shoes. The recoded data was statistically analyzed using repeated measures ANOVA. Results: The statistical analyses indicated significant differences between the different heel heights (P < 0.050). The raising of heel height caused increases in the mean velocity F(3,29) = 4.6; P < 0.015, path length F(3,29) = 23; P < 0.001, and the range F(3,29) = 23; P < 0.001 of the body sway in different conditions of this study. Conclusion: It seems that increasing in heel height caused some alteration in the boy sway parameters which could induce a postural instability.

Objective: This research is aimed to evaluate precisely a dynamic stability platform system to measure the center of gravity's sways around with fluctuations of cerebral spastic palsy children, before an after exercise therapy. Materials & Methods: Ten children with spastic diplegia cerebral palsy between 8 to15 years of age, wre participated in this quasi experimental (after – before) study. Their mean weight and height were (30.8kg ± 5.7kg) and (1.35m±0.09m) respectively. Subjects underwent a 12 weeks of exercise therapy. A dynamic stability platform system (BIODEX) was used to measure the center of gravity’s sway around the center of base of support (COBOS). The balance tests were repeated on stable, almost stable and unstable base of support as well as with and without shoes. Results: Findings showed that the mean sway of center of gravity of the cerebral palsy children was significantly decrease after exercise therapy by 0.2 degrees (P=0.001). The greatest improvement achieved on AP directions in all conditions. Wearing shoes resulted in a significant decrease on the body sway. Conclusion: Exercise therapy significantly improved body balance in CP children. The function of the proprioceptives of the hip and trunk can be improved by exercise therapy and therefore should be considered in rehabilitation program.