| Summary: | 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.
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