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tfischer55
06-25-1999, 12:12 AM
Thank you for the responses I did receive. It appears that limited
information is out there in the areana of distracted gait.

In my own search, I found a reference by Jerry Eubanks, Pedestrian Accident
Reconstruction. It is published by Lawyers and Judges Publishing. It
summarized several studies of pedestrian gait speed.
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This is our own data and is not yet published. It has only been
submitted as a thesis yesterday, but if it is a ball park figure you need,
we might be able to help.
We were looking at balance during walking and recorded data with a
triaxial accelerometer placed snuggly at the small of the back of our
subjects. We report here the results from 12 healthy persons over 60 who
acted as controls of an osteoarthritis study. We asked them to walk down a
20 m hallway at their own pace and trying to do it as close to their usual
gait as possible. We then asked them to walk while doing mental arithmetic,
successively subtracting 7 or 6 starting at 700 or 800. This dual task was
done in an effort to distract them in order to try to find subclinical
balance problems, especially in the patient group. Each of the two walking
conditions was measured twice in a session and the measurement session was
repeated 4 to 5 weeks later.
We calculated a large number of parameters, among them, mean walking
speed. The mean speed was found by taking the total distance divided by the
total time (as given by the accelerometer signals).
The average mean speeds (and standard deviations) for all subjects in
each session and test condition are as follows:
session 1 dual task mean: 1.1777 m/s stdev: 0.162 m/s
single task mean: 1.4679 m/s stdev: 0.212 m/s

session 2 dual task mean: 1.2213 m/s stdev: 0.229 m/s
single task mean: 1.3896 m/s stdev: 0.182 m/s

From this small table you can see that people slow down while
distracted, so much so that on a paired t-test between the single and dual
task, the null hypothesis could be rejected at a 2-tail significance of
0.000 in each of the sessions. (By the way, the comparisons between
sessions tested consistent with each other).
I realise this is a specific age group and a novel way of making the
measurements but I hope our results can be useful to you. If you have
further questions, I will be happy to answer them.
Ruth


************************************************** **************************
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Dr. Ruth Mayagoitia
Depto de Ingenierias
Universidad Iberoamericana
Prol. Paseo de la Reforma 880
01210 Mexico, D.F.
Mexico
tel: + 52 (5) 267 4079
fax: + 52 (5) 564 0722
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E. De Visser, J. Pauwels, J. Duysens, Th. Mulder and R.P.H. Veth. Gait
Adaptations during Walking under Visual and Cognitive Constrains; a Study
of Patients Recovering from Limbsaving Surgery of the Lower Limb. Am.
J. of PM & R. 77 (6): 503-509 1998.

May this will help you.
>
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I used a group of articles by N. H. Molen, R. H Rozendal et al. with my
dissertation that looked at location of walking characteristics. They are
primarily published in Proceedings of the Koninklijke Nederlandse Akademie van
Wetenschappen from the mid 60's to mid 70's. They are indexed in the Biology
Index. They are in English and most medical or biology libraries have them or
can get them on ILL. Good luck.
Beth Boyd, Ed.D., P.T.
University of South Florida
College of Medicine
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