Anthropometry Flashcards
Anthropometry
Measurement of the human body segments
Anthrompometric Measures
-mass
-moment of inertia
-COM
mass
amount of matter in a body, it’s resistance to acceleration
COM
center of mass: balance point about which free rotation occurs, all mass is equally distributed
MOI
moment of intertia: property describing resistance to angular acceleration, increases as mass is located farther from axis of rotation
inertial properties
mass, moi, com
body segments
-rigid body structures
-may be composed of small segments
-may be combined (HAT)
examples of body segments
feet, shank, thigh, trunk, upper arm, forearm, hands, head
Sum of Segment
mass * total mass
Segment average
(x1+x2)/2 =
COM Formulae
xcom
x coordinate com
m1
mass of first segment
m2
mass of second segment
mb
mass of whole body
x1
x coordinate of first segment COM
x2
x coordinate of second segment center of mass
ycom
y coordinate COM
y1
y coordinate of first segment com
y2
y coordinate of second segment com
Commonly Used Alternatives For Segment Estimations
-cadaver
-mathmatical modesl
-scanning/imaging
-kinematic techniques
How much does your thigh weight?
~9.7% of body weight
Format of Dempster Studies
8 older males
Cadaver study -cockpit design
Harless Studies
Cadaver Study
2 decapitaded males
Braune and Fischer
Cadaver Study
3 muscular males
Importance of Dempster studies
-segment mass as proportion of total mass
-COM and k as proportions of segment length
Mori and yamamoto
cadaver study
n=6
Clauser et al
preserved cadavers
13 males
Importance of clauser study
stepwise regression
-segment mass COM = F best antro measures
Chandler et al
cadaver study- 6 embalmed males
Importance of chandler study
focused on moment of inertia
Whitsett USAF
Modeling approach
solid geometric shapes
14 segments
Hanavan USAF
Modeling approach
geometric shapes
15 segments
Hatze
modeling approach
17 segments
242 anthro measures
complex
varying densities
Oscillation technique
Important Geometric models
Frustrum of cone for segments
Living subject approaches
Immersion
image based techniques
gamma ray
importance of zatsiorsky and seluyanov study
100 males, 15 females
Gamma Ray Imaging
Importance of De Leva
Built on zatsiorsky for segment endpoints
Mungiole and martin
MRI scans of male athletes legs
Where can kinematic techniques be used?
extremities only
How are kinematic techniques performed?
Measuring motion and relating that motion to a mechanical system (pendulum)
