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Body segment inertia properties of Japanese elderly

ReferenceBody segment inertia properties of Japanese elderly
JournalBiomechanism 13(1996)125-139
AuthorH.Okada, M.Ae, N.Fujii, Y.Morioka
ItemM COG I
StateLiving
Sample numberMale:90, Female:89
SexMale Female
AgeMale:62-86, Female 61-83
Measurement yearn/a
RaceJapanese
Measurement placeJapan
Measurement techniquePhotogrammetry
Raw data accesibilityNG

01

(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 mid-point between right and left greater trochanteric head.

c.Upper part of torso
Length from suprastanale to mid-point between left and right 10th rib point.

d.Lower part of torso
Length from mid-point between left and right 10th rib point to mid-point between left and right greater trochanteric head.

d.Foot
Length from acropodion

(3)Predictive model

(4)Validation

Regression coefficients

The ratio of the center of gravity

he following table shows the mean value of the ratio of the COG.
Note:
・The ratio of the COG is expressed as a percentage of the segment length measured from proximal end.
・Stature and segment length in m and body weight in kg

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 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, segment length in m.
Ex.)
Moment of inertia of the head around x-axis(kg・cm2)=-367.903+2843.24×segment length of head(m)+2.71413×body weight(kg)

Male

Female