Quantitative Study of Dynamic Postural Stability for Stroke Patients

• Main Authors: Lu, Li-Hwange, 呂理煌
• Other Authors: Yeh-Liang Hsu, Ming-Yih Lee
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/95547825665278692571

碩士 === 元智工學院 === 機械工程學系 === 84 === Postural control is the ability to maintain the body*s center- of-gravity over the base of support during upright standing. It is a complex process involving the coordinated actions of biomechamical, sensory, motor and central nervous system components. However, postural control like vision and hearing functions of human body will deteriorated over years. In U.S.A., about 30 percent of people older than 65 years of age experience a fall with approximately half of them havi?OMultiple incidents due to impairmt of postural control functions. In addition, people who are at fall risk particularly if they*ve had several injurious falls, tend to develop a fear of falling, which restricts their activities. Consequently, they develop lower extremity dysfunction in the form of disuse atrophy.In Taiwan, CVA has been ranking as the second column in the leading cause of death in the past ten years. The brain tissue injured after CVA can cause vari ous complications such as decreased muscle power, increase spastic of the affected side, motor control disturbance and ataxia. As a result, balance control are affected and fall accident is noted frequently during ambulation. Therefore, more effective dynamic postural control stability training protocols and modalities are needed for the patients with neulogical motor disabilities to regain their postural control function.Based on the abovementioned motivation, this research will focus on two issues in the area of postural control. In the first part of this research, an quantitative assessment model to evaluation standing postural stability will be established. The clinical experimental data (i.e. joint displacements, COP sway patterns) during upright standing balance tests for 11 stroke patients and 12 normal subjects will be analyzed. The postural recovery responses in turn of COP sway distance and latency of postural respse unites A/P and M/L directional disturbances will be compared between two test groups. A two dimensional balance responses probability contour map will be suggested. The shape, size and center location of balance response contour map representing the degree of dynamic postural stability can be easily identified for each test subject group. This graphical balance response contour map may become an useful quantitative assessment tool for clinical applications.In the second part of this research, a new body turning dynamic balance training device will be developed. This training device consists of instrumented platform, body turning perturb ation input device, foot pressure sensing device, joint angular displacement measuring device, EMG measuring interface, signal processing unit and control software. This new body turning training device can be incorporated with static/dynamic postural control training modalities as an quantitative postural stability assessment d training tools for stroke patients. This prototype device may provide a news era for future clinical studies of assessing body turning dynamic stability of stroke patients.