Galileo Research Facts No. 109: Can high frequencies increase muscle activation during Galileo Training?

This effect has been shown in several Galileo studies so far (#GRFS3, #GRFS95) – and it separates the Galileo from inexpensive machines: the large frequency range. And an effect and which can be tested by anyone standing on a Galileo device and changing the frequency: The higher the frequency the higher the muscle activation of the muscles. In this study the EMG signal of different muscles of the legs were measured at different frequencies between 5 and 30Hz (position 5, slightly flexed legs).

The results show an increase of the EMH amplitude of a factor of up to 5.5 at 30Hz compared to the signal at 5Hz or 10Hz (100% is equivalent to the signal amplitude at 5Hz). This is one of the reasons why for training goals like muscle hypertrophy, muscle power and endurance (or just for keeping muscle) high frequencies above 20Hz are significantly more effective than lower frequencies, because at high frequencies the muscle is more activated and therefore can be exhausted much faster – and this exhaustion is the main training trigger.

However, as explained in #GRFS95 the data analysis used in this study even underestimates the actual EMG amplitude because the frequency components equivalent to the vibration frequency were filtered out because it was believed they would be motion artifacts. Ritzmann et al. showed that in fact they are not motion artifacts (#GRFS23) because every movement of the Galileo platform actually triggers a stretch reflex. Therefore, the differences are probably even larger!

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