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AIST Human Body Database > Human Body Properties Database > Body Segment Parameters : 05) The Mass and Inertia Characteristics of the Main Segments of the Human Body

The Mass and Inertia Characteristics of the Main Segments of the Human Body

ReferenceThe Mass and Inertia Characteristics of the Main Segments of the Human Body
JournalBiomechanics V-IIIB(1983)1152-1159
Author V.Zatsiorsky
ItemM COG I
Stateliving
Sample number100
SexMale
Age45-65
Measurement yearn/a
RaceCaucasian
Measurement placeRussia
Measurement techniqueγ-ray scanner
Raw data accessibilityNG

01

(1)Definition of Body segmentation

16segments:Head, Upper part of torso, Middle part of torso, Lower part of torso, Thigh, Foot, Calf, Upper arm, Forearm, Hand

a.Head -Upper part of torso
Vertebra prominens

b.Upper part of torso -Middle part of torso
Xyphion

c.Middle part of torso-Lower part of torso
Omphalion

d.Upper part of torso -Upper arm
Akromion

e.Upper arm-Fore arm
Radiale

f.Fore arm-Hand
Stylion

g.lower part of torso-Thigh
The plane passes through iliospinale anterious and leans to 37° with respect to midline

h.Thigh-Calf
Tibiale

i.Calf-Foot
Sphyrion

(2)Predictive Model

(3)Validation

The ratio of the center of gravity

The following table shows regression coefficients.
The ratio of the COG is caluculated as the percentage of the segment length measured from the proximal end.
Ex.)
The ratio of the COG of head (%)=8.35700-0.00250×body weight(kg)+0.02300×stature(cm)

Segment mass

The following table shows regression coefficients.
Note:Weight in kg, stature in cm.
Ex.)
Head mass(kg)=1.29600+0.01710×body weight(kg)+0.01430×stature(cm)

Regression coefficients

Moment of inertia

The following table shows regression coefficients.
Note:
・The origin of the coordinate system for each segment is the center of gravity of that segment. The x-axis is defined as the frontal axis and +x is the direction from origin towards the front of the body. The y-axis is defined as the saggital axis and +y is the dorection from the origin towards the left of the body. The z-axis is defined as the horizontal-axis and +z is direction from the origin towards the head.
・Weight in kg, moment of inertia in kg・cm2, stature in cm.
Ex.)
Moment of inertia of the head around x-axis(kg・cm2)=-78+1.171×body weight(kg)+1.519×stature(cm)