Abstract
Vibration training and therapy devices differ significantly in oscillation parameters like amplitude, frequency, and also in quality and durability. The main reasons for these differences are the used movement principle (side-alternating, vertical, circular horizontal) and the mechanical driving mechanism used by a specific device. Oscillation parameters have an essential impact on training and therapy goals as well as on the performance of the device. As a consequence, significant differences are found between different quality and price categories, which can be relevant for application and safety.
The consequences of decreased production effort not only influence the usability and durability of a device, but also the quality of movement of the platform, namely the extent of high-frequency components related to potential health hazards. Most of these aspects interfere since the used mechanical principle design not only affects durability but also impacts on possible oscillation parameters as well as potential health hazards.
The marketing of devices, unfortunately, often uses incorrect and misleading performance parameters. Many manufacturers are referencing research which used completely different device types, with different oscillation parameters and movement principles. Altogether, this often implies a functionality that in fact is not possible with a specific device.
Quality aspects, therefore, not only include basic oscillation parameters like frequency, amplitude and movement principle but also their reproducibility, oscillation quality (high-frequency components), effects of loads (e.g., caused by intense exercise), durability, maintainability, device classification (training or medical), research performed with the actual device, and also professional support and product training.
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Notes
- 1.
To make calculationscalculations for this simple example easy, a vertical movement of the platform was assumed, which is certainly not correct for this example. Side-alternating systems in fact create an oscillating rotational movement. In this case instead of force and mass, the parameters torque and moment of inertia of the platform need to be used to calculate resulting external forces. Since calculations are much more complex for this movement the simple assumption of a vertical movement was used in this example which overestimates the resulting internal forces. The effects on stability of the complete device however are somehow comparable, while in vertical devices the whole device could be lifted off the ground (vertical movement), for side-alternating systems the resulting movement of the base of the system caused by these oscillating torques would be a side-alternating movement basically in opposite to the side-alternating movement of the platform. For vertical vibration systems the extent of the resulting system movements is related to the internal forces in relation to the mass of the non-moving system. For side-alternating devices the resulting movements are related to the internal torque in relation to the mass inertia of the non-moving system.
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Rawer, R. (2020). Design Principles of Available Machines. In: Rittweger, J. (eds) Manual of Vibration Exercise and Vibration Therapy. Springer, Cham. https://doi.org/10.1007/978-3-030-43985-9_3
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DOI: https://doi.org/10.1007/978-3-030-43985-9_3
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