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unknown user
11-25-1992, 04:08 PM
Dear Biomch-L subscribers,

Last monday, I posted a question from Grant Brooks about using
reflective paint to create markers for a video-based kinematic
analysis. There were many well-informed replies; it seems that
almost everybody has tried it. Thanks a lot to:

benjaw%utahusi.bitnet@utcs.utoronto.ca (Jeff Weiss)
murphyn@ERE.UMontreal.CA (Murphy Normand)
R_MARSHALL@FENNEL.WT.UWA.EDU.AU (Bob Marshall)
(Roland Mueller)
"Jim WALTON"
"AM. Wilson"
ferrigno@ipmel2.elet.polimi.it (Giancarlo Ferrigno)
"Christopher L. Vaughan"
bsm@occiput.egr.duke.edu (Barry Sidney Myers)
"A.W. Smith"
NICODEMUS@BEACH.UTMB.EDU (Nic Nicodemus)
Kathleen Long-Derickson
paul j guy

The general consensus is, that paint (sold by 3M) does not
nearly work as well as the reflective tape from the same company.
Most people have stopped using it. But it may work under certain
conditions.

Nic Nicodemus provided this information:
>I currently use the following paint as recommended by Motion Analysis
>Corp. Scotchlite 7216 White Reflective Liquid, 3M Company I.D. No.
>75-0299-0461-4. It is sold in 1 (one) pound cans (1 US Pint). Call 3M
>Traffic Control Materials Division, St Paul, MN 55144-1000 at
>(612) 733-1110.

The paint seems to require a special spray gun, to ensure that
the glass particles remain in suspension long enough. Otherwise
the reflection is very bad. One concern for muscle research is,
that with our Motion Analysis system we cannot increase the light
intensity without increasing the heat too. So we have to be
careful not to get barbecued muscles :-).

There was also some advice on the proper type of reflective tape.
We are using this tape for gait analysis markers, but Grant needs
*very* small (preferably sherical) markers for his experiments.

Two respondents are successfully using black paint on ligaments (Jeff
Weiss) or muscles (Barry Myers). That seems to provide sufficient
contrast.

If anyone wants to read all the replies, drop me an E-mail note and I
will forward the full text.

-- Ton van den Bogert
Human Performance Laboratory
University of Calgary, Canada