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Standing footprint diagnostic method
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10.1063/1.4827859
/content/aip/journal/jap/114/16/10.1063/1.4827859
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/16/10.1063/1.4827859

Figures

Image of FIG. 1.
FIG. 1.

Distribution of COP and SFPA. (a) COP distribution when standing with feet together. (b) COP distribution when standing with feet shoulder width apart. (c) COP distribution when standing with feet slightly wider than shoulder width. (d) SFPA distribution when standing with feet together. (e) SFPA distribution when standing with feet shoulder width apart. (f) SFPA distribution when standing with feet slightly wider than shoulder width. In Figs. 1(a)–1(c) , the red circle stands for all participant's COP average radius at each instant. The values for three postures are 0.5391 cm, 0.287 cm, and 0.288 cm, respectively. In Figs. 1(d)–1(f) , the red line stands for each participant's SFPA value that is greater than zero at each instant, 8.455°, 0.469°, and 0.232°, respectively. The green line stands for each participant's SFPA value that is less than zero at each instant, −5.701°, −0.499°, and −0.235°, respectively.

Image of FIG. 2.
FIG. 2.

Distribution of ACOP and MCOP displacement. (a) Distribution of ACOP and MCOP when standing with feet together. (b) Distribution of ACOP and MCOP when standing with feet shoulder width apart. (c) Distribution of ACOP and MCOP when standing with feet slightly wider than shoulder. The calculation of the position value in the figures: first calculate the mean value of the position of ACOP and MCOP when standing, and then calculate the COP position of each instant relative to the mean value.

Image of FIG. 3.
FIG. 3.

Direction distribution of SFPA. (a) Direction distribution of SFPA when standing with feet together. (b) Direction distribution of SFPA when standing with feet shoulder width apart. (c) Direction distribution of SFPA when standing with feet slightly wider than shoulder. The calculation of the direction value in the figures: first calculate the mean value of the direction of SFPA when standing, and then calculate the direction value of each instant relative to the mean value.

Image of FIG. 4.
FIG. 4.

Relation between position, posture, plantar pressures and COP and SFPA. (a) Relation between anteroposterior position change of both feet and SFPA. (b) Relation between plantar pressure change of both feet and COP and SFPA. (c) Relation between the rotation of foot and SFPA. In Fig. 4(a) , left and right foot move anteroposterior symmetrically, i.e., when the left foot moves forward, the right foot moves backward. In Fig. 4(b) , when left foot plantar pressure remains unchanged, the right foot plantar pressure multiplies a coefficient (e.g., 1.1 or 0.9) so that the plantar pressures from left and right foot are inconsistent. In Fig. 4(c) , when left foot remains unchanged, the right foot rotates around its COP. One foot's instantaneous pressure is 323.26N and there are 115 , indicating the standing footprint area is 115 cm2. The foot's SFPA is ±16.52° (left foot is positive and left negative). Let the COP distance between the foot and the cloned one be 11.67 cm when standing with feet together. When standing with feet shoulder width apart, the distance is 28.67 cm and when standing with feet slightly wider than shoulder width, the distance is 51.67 cm.

Tables

Generic image for table
Table I.

ACOP, MCOP displacement, and direction of SFPA (Mean ± SD). The displacement unit is cm and the direction unit is degree. The calculation of the position value in the table: first calculate the mean value of the position of ACOP and MCOP when standing, and then calculate the COP position of each instant relative to the mean value. The calculation of the direction value in the table: first calculate the mean value of the direction of SFPA when standing, and then calculate the direction value of each instant relative to the mean value.

Generic image for table
Table II.

Symmetry of standing posture (Mean ± SD). The displacement unit is cm and the direction unit is degree.

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/content/aip/journal/jap/114/16/10.1063/1.4827859
2013-10-30
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Standing footprint diagnostic method
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/16/10.1063/1.4827859
10.1063/1.4827859
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