View Full Version : Shoulder and Neck Scaling Issue

10-26-2007, 09:40 AM
We are investigating how skeletal geometry affects gender differences
in neck strength.

To do this, we are working to develop neck musculoskeletal models of
height-matched males and females. Thus, we need to know how both
gender and body height affect vertebral, skull and shoulder girdle
geometry to obtain muscle attachment sites.

A previous study in our lab found geometric differences in head and
neck external dimensions (e.g. head and neck circumference) and
vertebral geometry (depth and width) in men and women who were matched
for standing height and neck length (unfortunately, lacking full
geometric data of C1, C2 and T1).

We can use these data to scale vertebral and skull size across gender,
but unfortunately we do not know how shoulder girdle (and ribcage)
size (depth and width) scale with height. We need these information to
place muscle attachments of muscles such as sternocleidomastoid,
trapezius, levator scapular and scalenus.

We are aware of several anthropometric studies that report percentile
values of body measurements. A lot of information is about 50th
percentile female/male, but we are working with Visible Human Female
(VHF) data which is 65th percentile height female. Furthermore, we do
not know, for example, that a 65th percentile height female has 65th
percentile shoulder width.

Therefore, we are looking for information on:
---How shoulder girdle dimensions (in three dimensions) scale with
body height and gender?
---How vertebral height, depth and width scale with body height and
gender (especially C1, C2 and T1)?

We are aware of the following anthropometric sources:

--Bodyspace: Anthropometry, Ergonomics and Design' by Stephen Pheasant
(isbn 0-85066-340-7), published by Taylor and Francis 1986.
--Chaffin, D.B. Occupational Biomechanics. 1st ed. New York: John
Wiley & Sons, Inc., 1984

Online source:
--Dempster, "Space requirements of the seated operator", 1955. (19 MBs, PDF)
--Clauser, "Weigth, volume, and center of mass of segments of the
human body " , 1969. (5.5 MBs, PDF)
--Chandler, "Investigation of Inertial Properties of the Human Body" ,
1975. (6.5 MBs, PDF)
--Young, " Anthropometric and Mass Distribution Characteristics of the
Adult Female", 1983 (digitised by D. Veeger). (8.7 MBs, PDF)

Any related information would be appreciated.

Anita Vasavada, Ph.D.
Assistant Professor
School of Chemical Engineering and Bioengineering
Washington State University
Pullman, WA 99164-6520
voice: (509) 335-7533
fax: (509) 335-4650

Liying Zheng
Ph.D Student
Department of Mechanical and Materials Engineering
Washington State University
Pullman, WA 99164-2920