John R. Hutchinson

09-20-2000, 02:42 AM

Hello,

Alexander et al. (1979, reference below) used a simple

formula to estimate the maximum value of the vertical component of

the ground reaction force (at mid-stance) on a single limb of a

running quadruped:

F = (3.14159 * p * mass * g) / (4 * duty factor)

where p is the proportion of body weight that the limbs (fore/hind)

support. For a biped, of course, p would be 1; in most quadrupeds

fore and hind p would respectively be ~0.6 and 0.4.

Has anyone in the literature commented on this formula since

then, especially with revisions of the formula? Please reply

off-list and I can post a summary if it gets interesting. Thanks!

--John

Ref:

Alexander et al. 1979. Mechanical stresses in fast locomotion

of buffalo (Syncerus caffer) and elephant (Loxodonta africana).

Journal of Zoology 189:135-144.

--

==================

John R. Hutchinson

Department of Integrative Biology Phone: (510) 643-2109

3060 Valley Life Sciences Bldg. Fax: (510) 642-1822

University of California

Berkeley, CA 94720-3140

http://www.ucmp.berkeley.edu/people/jrh/homepage.html

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Alexander et al. (1979, reference below) used a simple

formula to estimate the maximum value of the vertical component of

the ground reaction force (at mid-stance) on a single limb of a

running quadruped:

F = (3.14159 * p * mass * g) / (4 * duty factor)

where p is the proportion of body weight that the limbs (fore/hind)

support. For a biped, of course, p would be 1; in most quadrupeds

fore and hind p would respectively be ~0.6 and 0.4.

Has anyone in the literature commented on this formula since

then, especially with revisions of the formula? Please reply

off-list and I can post a summary if it gets interesting. Thanks!

--John

Ref:

Alexander et al. 1979. Mechanical stresses in fast locomotion

of buffalo (Syncerus caffer) and elephant (Loxodonta africana).

Journal of Zoology 189:135-144.

--

==================

John R. Hutchinson

Department of Integrative Biology Phone: (510) 643-2109

3060 Valley Life Sciences Bldg. Fax: (510) 642-1822

University of California

Berkeley, CA 94720-3140

http://www.ucmp.berkeley.edu/people/jrh/homepage.html

---------------------------------------------------------------

To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl

For information and archives: http://isb.ri.ccf.org/biomch-l

---------------------------------------------------------------