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Leia Bernardi Bagesteiro
04-07-1997, 11:24 PM
Dear Biomch-l readers:

Last week I posted a message asking for kinematic and kinetic running
frequency, here are the responses that I did receive. Thanks to all that
replied !

Edwin DeMont, Ph.D. :
Alexander, R.McN. and A.S. Jayes (1980). Fourier analysis of
forces exerted in walking and running. J. Biomechanics 13: 383-390.

Ed Quigley :
I did a residual analysis (see Winter, Biomechanics and Motor Control of
Human Movement) on running data I colleced for my thesis. Sujects ran at
6 min/mile pace and I aquired video data at 240 fps. The residual
analysis showed that most of signal was below 15-25 Hz depending on the
marker location and coordinate direction. Another student did the same
thing on similar data collected at 120 fps and found a frequency content
of 8-12 Hz. These analyses were done on the raw coordinate data and I
never examined the kinetic (forceplate data). I hope this is helpful.


Chris Kirtley :
As I understand it, the frequency content of human motion tails off after
the 6th harmonic of the natural frequency of the motion. So, if you walk at
1 cycle per second (cadence 120 steps/m) you'll get frequencies up to 6 Hz.
If you run at 3 Hz (cadence 360 steps/m) you'll get signals with harmonic
content up to 18 Hz. But this is a rule of thumb, of course. The way to
really assess it would be to do a residual analysis on your pre and post
filtered data - if you've a lot left over then it's a sure sign that your
filter was set too low and you've lost information.

Christian Peham :
we did Fourier-Analysis of trotting horses. The movement of the
head and trunk were only the fundamental wave(frequency=1/(duration
of one motion-cycle)) and the first harmonic wave. The movement of
the extremities include higher frequency parts til the 15th harmonic
wave.
If you watch the impact of the hoof e. g. signal parts with the
freuquency of 200 Hz and more occure.
About the head movement we published the paper:
C. PEHAM, M. SCHEIDL, TH. LICKA (1996)
"A method of signal-processing in motion analysis of the trotting
horse". in J. of Biomech. 29/8, p. 1111-1114.

Winter, David A., 1930-
Biomechanics and motor control of human movement / David A.
Winter. 2nd ed.
New York : Wiley, c1990.


Please, if someone has other references I would appreciate that.
Thanks.