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Quantitative assessment of the level of instability of a single-plane balance platform
Vaidotas Gudziunas1, Aurelijus Domeika1, Linas Puodžiukynas2
1Institute of Mechatronics, Kaunas University of Technology, Kaunas, Lithuania.
Background:
Balance training on unstable surfaces is widely used in medicine and sports. The main disadvantage of balance platforms is weakly definable assessment of the level of instability (IL) they create.
Objective:
To evaluate the mechanical characteristics of a suspended single-plane instability balance platform which determines quantitative instability characteristics.
Methods:
Three criteria influencing the IL were evaluated: 1. The displacement of the platform board by changing the position of the object on the board; 2. Amount of force required for board displacement; 3. The vibration damping of the platform.
Results:
1. 1IL the displacement of the object on the board affected 0.66 cm. the displacement of the board relative to the platform frame; 2IL - 0.79 cm; 3IL - 0.91 cm.; 2. A force of 2.64 is required for a board displacement of 1IL compared to 2IL and 5.76 times that of 3IL. 3. Damping factor 1IL - 0.015, 2IL - 0.006, 3IL - 0.003.
Conclusions:
1. The longer the suspension, the change in the position of the object on the board affects the greater movement of the board relative to the platform. 2. Different IL can be compared with each other depending on how different the force required to cause the board to move. 3. The platform dampens vibrations weakly, but the damping between 1 and 3 IL differs about 5 times.
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