Multi-Objective Optimal Control Strategies of the Locomotor System of Young Women in High-Heeled During Obstacle-Crossing
Date Issued
2014
Date
2014
Author(s)
Chen, I-Hsiang
Abstract
With the highly developed of social economy, many women wear high-heeled shoes in both professional and fashionable settings. The elevation of the heel height increases the challenge to the neuromusculoskeletal system, leading to injuries such as fracture and ankle sprain. The obstacle crossing also increases the difficulty of balance control and the risk of falling. There are many studies about the level walking and obstacle crossing with high-heeled shoes but most of them focus on the influence of kinematics, kinetics, center of mass and center of pressure. However, the results still remains controversial and unable to discover the overall control strategies of the whole motion. With the algorithm of multi-objective optimal control (MOOC) technique in our laboratory, we suggested that obstacle-crossing was formulated as an optimal control problem with two conflicting objectives: minimization of mechanical energy expenditure and maximization of foot-obstacle clearance and able to describe the overall control strategies during obstacle crossing.
The purposes of the present study were to investigate the effects of control strategies of young women in high-heeled during obstacle crossing through the multi-objective optimal control technique and analyze the effects of obstacle height and shoes height respectively. Fourteen female habitual wearer’s 3D kinematics and kinetics information during obstacle crossing were selected in the present study. No significant difference was found in any obstacle height and heel height condition. The weighting of energy expenditure is about 0.46 to 0.76. It appears that the compromise between mechanical energy expenditure and foot-obstacle clearance is not affected after wearing the high-heeled shoes. The main reason for this is not only due to the process from stance phase to swing phase of swing limb was not influenced while the heel height was increased but also the interference of proprioception. Some studies proved that some particular classes of action are executed as a motor program. Thus, wearer remain the same control strategies in high-heeled during obstacle crossing.
Using a large number of parameter to explore the obstacle crossing is difficult to describe to control strategies of whole motion and the results are still not fully consistent. The results of this study can provide a simpler and clearer tool to describe the control strategies in high-heeled during obstacle-crossing.
Subjects
高跟鞋
跨越障礙物
多目標最佳控制方法
控制策略
Type
thesis
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