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Body segment mass, radius and radius of gyration proportions of children

ReferenceBody segment mass, radius and radius of gyration proportions of children
JournalJ.Biomechanics, Vol.19,359-368 (1986)
AuthorR.K.Jensen
ItemCOG M I
StateLiving
Sample number12
SexMale
Age4-15
Measurement yearn/a
RaceCaucasian
Measurement placen/a
Measurement techniquePhotogrammetry
Raw data accessibilityNG

01

(1)Definition of body segmentation

16segments:Head, Neck, Upper part of torso, Lower part of torso, Upper arm, Forearm, Hand, Thigh, Calf, Foot.
It is refered the definition of Clauser.The following definitions are original.

Head―Neck
The cut plane passes horizontally through the second vertebra.

Neck―Upper part of torso
The cut plane is located at the junction of the seventh vertebra and first thoracic vertebra.

Upper part of torso―Upper arm
The cut plane begins at the acromion, and extends to the armpit following the medial border of the deltoid muscle.

Upper part of torso―Lower part of torso
The cut plane passes horizontally through the inferior edge of the xiphoid process.

(2)Predictive model

(3)Validation

Comparison between direct measurement of body weight and measurement by photogrammetry.
→Error: less than 4%

Regression coefficients

The ratio of the segment mass

The following table shows regression coefficients.
The ratio of the segment mass is expressed as a percentage of body mass
Ex.)
The ratio of the head mass=0.2376-0.114×age

The ratio of the center of gravity

The following table shows regression coefficients.
The ratio of the COG is calculated as percentage of the segment length measured from the proximal end.
Ex.)
The ratio of the COG of the head(%) =0.4833+0.0025×age

The ratio of the radii of gyration

The following table shows regression coefficients.
The ratio of the radius of gyration is the ratio of the semiaxis of the body segment at the center of gravity to the segment length.
Ex.)
The ratio of the radius of gyration of the head =0.5748+0.0021×age