View Full Version : Re: SUMMARTNormal gait: Are joint angle standarddeviationslargeratma ximal joint angular velocities?

Ton Van Den Bogert
04-17-2003, 04:10 AM
Chris Kirtley was kind enough to try what I suggested, and
sent me some data to illustrate the point. The file is here:

It indeed shows the highest SD when velocity is highest.

Attached below are Chris' comments (forwarded & edited with


Ton van den Bogert

-------- Original Message --------
Subject: SD
Date: Thu, 17 Apr 2003 07:21:45 -0700 (PDT)
From: Chris Kirtley
Reply-To: kirtley@cua.edu
To: bogert@bme.ri.ccf.org

Dear Ton,

See you point. Here's some data (Richard Baker's - I trust him most!). It pretty much backs what
you say [...].

Sorry - can't send to the list as I'm at home on the Easter break [...] and can't use my smtp server.

I just plotted the Velocity vs SD scattergrams (see attached - scroll down for the scatterplots).
Here are the correlations:

Hip: 0.15
Knee: 0.79
Ankle: 0.34

So, interestingly, the knee actually shows the best correlation. The hip has a weird loop in it.

To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
For information and archives: http://isb.ri.ccf.org/biomch-l