Saturday, April 4, 2015
Wednesday, March 11, 2015
Kinetisense featured in Parkinson's research project with University of Lethbridge
Making
biomechanical measurements in the field:
Use
of Kinetisense to examine post-exercise proprioception
prepared
by Dr. Jon Doan, University of Lethbridge, Alberta
INTRODUCTION
Kinesthetic
proprioception is the awareness of the position and
movement of parts of the body (KP). KP is an important component in
many human movements, from our first steps to our biggest physical
achievements to our everyday activities, like maintaining balance. KP
relies on communication between the peripheral nervous system and the
central nervous system to interpret current position, then provide
feedback on subsequent changes in position.
Unfortunately,
accurate KP can be a challenge in some neuropathologies, including
Parkinson disease. This deficit can lead to uncoordinated movements,
postural disturbance, and increased risk of falls. Vigorous exercise
has provided good therapy for balance and movement deficits amongst
some neuropathological patients, but the specific neuromechanisms are
unclear. Understanding the immediate and long-term benefits of
exercise on KP and function would be extremely helpful for improved
health and quality of life.
The
Kinetisense system provides a quick and accurate means to immediately assess
proprioception in the field. Conventional motion capture requires
extensive calibration plus participant preparation to capture data.
With the Kinetisense, a participant can step in front of the Kinect
sensor in their street clothes and near-instantly start producing
motion capture data. This is particularly important in field
environments, like sports settings or workplaces, where long duration
set-up might not be feasible, given time, space, or financial
constraint.
THE
STUDY
In
this case study, we used the Kinetisense system in the dressing room of a
local arena to examine the immediate and long-term influence of ice
skating exercise on proprioception for a person living with Parkinson
disease, and for a neurotypical control subject. Both exercising
subjects were tested before and after their sixty minute skating
practice session, and both exercising subjects were regular skaters.
Four control subjects were used for comparison – they were also
tested pre- and post-, but skating exercise was replaced with
television watching for the control group. None of the controls were
regular skaters.
The
Kinetisense system was used both to generate the proprioceptive cues
and to capture the proprioceptive data. Screen shots from the
Kinetisense software with a researcher subject were combined into a
presentation that experimental participants watched during their
testing (Figure 1). Those participants were asked to get themselves
into the same postures demonstrated in the presentation, and the
Kinetisense system was used to capture the postures assumed by the
participants. Accuracy was determined as the difference between the
assumed posture and the presentation posture for each of the pre- and
post-exercise condition, and variability was determined for the
assumed postures between pre- and post-exercise conditions. In this
model, increased accuracy in post-exercise would demonstrate good
immediate improvement in proprioception from skating exercise, while
low variability amongst the skating group might suggest some
long-term KP benefits from exercise.
THE
RESULTS
A general trend of overshooting target angles was observed for postures where limbs were closer to the body, while less stable postures tended to be undershot. When results of the pre and post-test were compared, PD subject variance was 4.9° (compared to 5.9° and 6.3° for control and skater). The control group increased accuracy by 0.26°, but PD subject decreased accuracy by 0.18°.
THE
CONCLUSION
Low
variance for our PD participant suggests that regular vigorous
physical exercise has a beneficial effect, but that benefit may be
swamped by fatigue immediately after exercise (where PD participant
had slightly decreased activity.
In
this study, the Kinetisense system was doubly-useful - the clear picture,
with overlaid stick model and dashboard information surround, made
the output of the software a clear and effective postural instruction
for participants, while the quick set-up and markerless motion
capture makes accurate postural measurements in field settings quick
and easy.
Jon
Doan
Associate Professor
Associate Professor
Dr.
Doan’s research combines mechanical and biological engineering with
kinesiology and neuroscience to focus on measuring and interpreting
the interaction of human perceptions and actions at work and at play.
His current research explores two main topics: 1) perceptual basis
of occupational over-loading and soft tissue injury, and 2) exercise
therapy and biomedical devices for neurorehabilitation amongst people
living with Parkinson's disease. Dr. Doan's research combines field
work with experimental studies in the Engineering and Human
Performance Laboratory. Dr. Doan is currently accepting graduate
students.
Dr.
Doan’s course offerings include Research Methodologies (2200),
Functional Biomechanics (2650), Biomechanics (3650), Work and
Physical Ergonomics (4300), Advanced Biomechanics (4550), and
Bioinstrumentation (4660). Dr. Doan is available to supervise both
independent and applied studies courses.
Please
view Dr. Doan’s Directory
Profile for
more information.
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