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Experimental Determination of Horizontal Motion of Human Center of Gravity During Squatting

Authors

  • G. Fekete,

    Corresponding author
    1. Department of Mechanical Construction and Production, Laboratory Soete, Engineering Faculty, Ghent University, Sint-Pietersnieuwstraat, Gent, Belgium
    • Correspondence

      G. Fekete, Department of Mechanical Construction and Production, Laboratory Soete, Engineering Faculty, Ghent University, Sint-Pietersnieuwstraat 41, Gent 9000, Belgium

      Email: gusztav.fekete@ugent.be

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  • B.M. Csizmadia,

    1. Institute of Mechanics and Machinery, Mechanical Engineering Faculty, Szent István University, Páter Károly u. 1, Gödöllő, Hungary
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  • M.A. Wahab,

    1. Department of Mechanical Construction and Production, Laboratory Soete, Engineering Faculty, Ghent University, Sint-Pietersnieuwstraat, Gent, Belgium
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  • P.D. Baets

    1. Department of Mechanical Construction and Production, Laboratory Soete, Engineering Faculty, Ghent University, Sint-Pietersnieuwstraat, Gent, Belgium
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Abstract

The excursion of the center of gravity (COG) line is often examined in terms of balance control, standing, walking or running locomotion, etc. Although these examinations are carried out on multiple human subjects, the obtained results are not bound to any “human-like” quantity such as the anatomically well-defined and widely accepted angle of flexion. This paper is meant to prove the following hypotheses: the horizontal excursion of the COG line changes its position during squatting in contrary with steady-state assumption and it can be derived as a single empirical function of flexion angle. A test setup was developed for the experiments, alongside with an experiment protocol and a special construction method to obtain the results. During the experiments, 16 healthy, male and female participants' data were used as a basis for the dimensionless λ functions. The results showed common characteristics between the subjects' data, and suggested that the general relationship between the squatting and the excursion of COG can be described with linear, dimensionless functions. As a final goal of this study, the obtained dimensionless functions will be used in a mathematical model, which is being developed.

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