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J Biomech. 2014 Jan 22;47(2):560-7. doi: 10.1016/j.jbiomech.2013.09.028. Epub 2013 Oct 29.

A new measure for upright stability.

Author information

1
Department of Mechanical and Environmental Informatics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152-8552 Tokyo, Japan. Electronic address: hadi@nagoya.riken.jp.
2
Department of Mechanical and Control Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152-8552 Tokyo, Japan. Electronic address: motomu@mech.titech.ac.jp.

Abstract

The control of balance is a primary objective in most human movements. In many cases, research or practice, it is essential to quantitatively know how good the balance is at a body posture or at every moment during a task. In this paper we suggest a new measure for postural upright stability which assigns a value to a body state based on the probability of avoiding a fall initiation from that state. The balance recovery problem is solved for a population sample using a strength database, and the probability of successfully maintaining the balance is found over the population and called the probability of recovery (PoR). It, therefore, describes an attribute of a body state: how possible the control of balance is, or how safe being at that state is. We also show the PoR calculated for a 3-link body model for all states on a plane, compare it to that found using a 2-link model, and compare it to a conventional metric: the margin of stability (MoS). It is shown, for example, that MoS may be very low at a state from which most of the people will be able to easily control their balance.

KEYWORDS:

Balance; Body state; Perturbation; Postural upright stability

PMID:
24321443
DOI:
10.1016/j.jbiomech.2013.09.028
[Indexed for MEDLINE]
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