At the same G force or acceleration, we have a strong contraction of the quadriceps on the alternate (Galileo Fitness and Basic in this case), while on the uniform (vibrogym, DKN, Globus) at the same peak acceleration measure the muscle contraction is significantly weaker or not so strong.
How is that possible?
Why at the same G force do we have more muscle contraction with the Alternate vibration?
We believe it's due to a double factor: the different shape of the waveform and the excursion. The neuro-muscular reflex response (the miotactic effect) seems to be better activated by the hard attack of the Alternate curve rather than the Uniform smooth one. In addition with the Alternate we have more magnitude or excursion: 6 to 10 mm versus 2 to 3 mm of the Uniform.
At 18Hz with 6mm (5G) with the Alternate vibration we feel the same muscle contraction that we feel at 35Hz with 3mm (6G) on a Uniform vibration platform or at 45Hz with a 2mm magnitude.
Let's take a closer look to the waveform shape of the main technologies to understand:
You can see clearly that the attack of the Alternate is harder than the Uniform vibration. The stimulus event comes in advance and sharply.
Below the magnitude (or platform excursion) at this example
We believe that Alternate vibration (the Galileo Alternate vibration for this is the one we compared to multiple Uniform Vertical devices) acts better on the miotactic reflex and the reason can be found partially in the harder waveform shape attack and partially in the higher magnitude.
The conclusion is that you need less G force (a 20% estimated) on an Alternate Vertical device to get the same results that you get with an Uniform Vertical one.
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