Abstract
This study investigates the agreement between two methods used for the assessment of human balance system. Static posturography based on tensometers, using a commercially available platform, is used as the reference method. An alternative approach is a portable prototype MediPost system that utilises inertial sensors developed by the authors. Both approaches determine the movement of the subject's centre of mass, quantifying this movement in terms of angular speed. Data for the evaluation of agreement were obtained from 205 subjects, with each subject simultaneously tested with both methods. During the tests, the subject performed a set of standard procedures involving quiet standing in an upright position. In order to verify the agreement between the evaluated methods, the Bland-Altman, concordance correlation and intraclass correlation coefficients were used. In addition, the trajectories of the centre of gravity were compared. The obtained results show good agreement between the verified methods, even though they are based on different physical phenomena.
Highlights
Inability to keep balance of the body may result from deficiencies in many systems of our organism
In order to check the agreement between static posturography based on tensometers and MediPost, three analysis methods are used, namely, the Bland-Altman, concordance correlation [29], [30] and intraclass correlation coefficients [31]
Thresholds for the intraclass correlation coefficient (ICC) are more varied, with some authors stating that values above 0.75 mean excellent correlation [32] while others push this threshold up to 0.9 [33]
Summary
Inability to keep balance of the body may result from deficiencies in many systems of our organism. Of 979.485 million people reporting to various health centers, 7.443 million patients reported vertigo and dizziness, accounting for 0.8% of visits made during this period [1]. In 2005, Nauhauser published the results of his research, which was based on 4,869 telephone respondents. They show that dizziness occurs in 5% of respondents in the German population [2]. Whilst in Scotland, Hannaford et al, based on their reports on a representation of 15,788 people surveyed, determined the number of dizziness complaints reported at 21% of those respondents [3].
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