Investigation of ground reaction force distribution beneath the foot in postural control

Download
2014
Akbarifar, Roshanak
It has been reported that the ground reaction force (GRF) beneath the foot is distributed by the ratio of 1/3 in metatarsals and 2/3 in calcaneous. The main aim of this thesis is to check the ratio of GRF distribution with respect to front and hint regions of the foot and to understand the importance of the distribution ratio/rule in postural control. A mathematical model is designed and simulated using MATLAB® and Simulink® in which the foot is modeled as a deformable body, instead of being rigid, which has widely been used as a modeling attempt in the previous literature. The output signals of model and their behaviors in time were compared with the next stage experimental results for any similarities. The second stage of the thesis is data collection. Data were collected using a pressure mat, a forceplate and a motion capture system. Data analyses were performed using codes written in MATLAB® and results were interpreted in different sections. Results showed that subjects were standing more stable during bipedal trials rather than unipedal trials; and more stable during open-eyes trials rather than closed eyes. The “1/3 & 2/3” rule was observed in all of the trials but there were greater errors in unipedal trials than in bipedal because the stability of subjects was disturbed more frequently. Calculating the correlation between body center of pressure and different pressure components beneath foot, it was observed that center of pressure was mostly correlated with the pressure component under metatarsals of the right foot.

Suggestions

Statistical analysis of force distribution on the plantar foot during quiet stance
Alkan, Okan; Gürses, Senih; Tarman, Işık Hakan; Department of Engineering Sciences (2015)
In most of the posture studies, foot is considered as a single rigid body.However, recent works focused on multi-segmented kinematic foot models and ground reaction force distribution beneath the feet. This thesis presents a study on the role of the foot as a deformable body for controlling the human erect posture. A pressure-pad and a force platform were used in order to determine the distribution of ground reaction forces (GRF). Pressure distribution data beneath the feet of seven male and female right-ha...
Measurement of the ratio of the 3-jet to 2-jet cross sections in pp collisions at root s=7 TeV
Chatrchyan, S.; et. al. (Elsevier BV, 2011-08-01)
A measurement of the ratio of the inclusive 3-jet to 2-jet cross sections as a function of the total jet transverse momentum. HT, in the range 0.2 0.5 TeV. This measurement extends to an H-T range that has not been explored before. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at root s=7 TeV
Khachatryan, V.; et. al. (Elsevier BV, 2015-10-01)
Differential cross sections as a function of transverse momentum p(T) are presented for the production of Upsilon(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9 fb(-1) in pp collisions at root s = 7 TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity vertical bar y vertical bar < 1.2 and dimuon transverse momentum in the range 10 < p(T) < 100 GeV. The measurements show a transition from an expone...
Assessment of rock slope stability by slope mass rating (SMR): A case study for the gas flare site in Assalouyeh, South of Iran
AZARAFZA, Mohammad; Akgün, Haluk; ASGHARI-KALJAHI, Ebrahim (2017-10-01)
Slope mass rating (SMR) is commonly used for the geomechanical classification of rock masses in an attempt to evaluate the stability of slopes. SMR is calculated from the RMR89-basic (basic rock mass rating) and from the characteristic features of discontinuities, and may be applied to slope stability analysis as well as to slope support recommendations.
Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at root s=7 TeV and first determination of the strong coupling constant in the TeV range
Chatrchyan, S.; et. al. (Springer Science and Business Media LLC, 2013-10-01)
A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, , of the two leading jets in the event. The data sample was collected during 2011 at a proton-proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb(-1). The strong coupling constant at the scale of the Z boson mass is determined to be alpha(S)(M-Z) = 0.1148 +/- 0.0014 (exp.) +/...
Citation Formats
R. Akbarifar, “Investigation of ground reaction force distribution beneath the foot in postural control,” M.S. - Master of Science, Middle East Technical University, 2014.