Body segment parameters of Japanese adults
Reference  Body segment parameters of Japanese adults 
Journal  Biomechanism 11(1992)2333 
Author  M.Ae, H.Tang, T.Yokoi 
Item  M COG I 
State  Living 
Sample number  Male 215 / Female 80 
Sex  Male Female 
Age  Male 1823 / Female 1824 
Measurement year  n/a 
Race  Japanese 
Measurement place  Japan 
Measurement technique  Photogrammetry 
Raw data accesibility  NG 
(1)Definition of body segmentation
15segments: Head, Upper part of torso,Lower part of torso, Upper arm, Forearm, Hand, Thigh, Calf, Foot
a.Head－Upper part of torso
Larynx point
b.Upper part of torso－Lower part of torso
The 10th rib point
c.Upper part of torso－Upper arm
]
Acromion
d.Upper arm－Forearm
Center of the elbow joint
e.Forearm－Hand
Center of the elbow joint
f.Lower part of torso－Thigh
Greater trochanteric head
g.Thigh－Calf
Center of the knee joint
h.Calf－Foot
Center of the ankle joint
(2)Definition of segment length
a.Head
Tragion to vertex height
b.Total torso
Length from suprasternale to midpoint between right and left greater trochanteric head.
c.Upper part of torso
Length from suprastanale to midpoint between left and right 10th rib point.
d.Lower part of torso
Length from midpoint between left and right 10th rib point to midpoint between left and right greater trochanteric head.
d.Foot
Length from acropodion
(3)Predictive model
 The ratio of the center of gravity is calculated as the mean value of the percentage of the segment length measured from the proximal end.
 Segment mass and moment of inertia are calculated using regression equations that include segmentlength and body weight as independent variables.
(4)Validation

 A.Comparison of body weight measurement between photogrammetry and direct measurement.
 > Error: male 2.1±1.3% female 1.9±1.4%

 B.Comparison of body weight measurement between photogrammetry and direct measurement.
 > Error: male 0.9±0.8% female 1.5±0.9%
Regression coefficients
The ratio of the center of gravity
he following table shows the mean value of the ratio of the COG.
Male
Female
Segment mass
The following table shows regression coefficients.
Ex.)
Head mass(kg)=1.1968+25.9526×segment length of the head(m)+0.015×body weight(kg)
Male
Female
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 xaxis is defined as the frontal axis and +x is the direction from origin towards the front of the body. The yaxis is defined as the saggital axis and +y is the dorection from the origin towards the left of the body. The zaxis is defined as the horizontalaxis and +z is direction from the origin towards the head.
・Weight in kg, moment of inertia in kg・cm^{2}, segment length in m.
Ex.)
Moment of inertia of the head around xaxis(kg・cm^{2})=367.903+2843.24×segment length of head(m)+2.71413×Body weight(kg)