Pardon my English response - I am better able to express myself.
Hyperactivity is simply a description of being more active than the average person (arguments will always be raised on what is average). Hyperactivity as a disorder or syndrome will not exist on it's own but rather as part of ADHD (and some others).
Low muscle tone can be diagnosed by a physiotherapist or chiropractor, who may refer you depending on the cause of the low muscle tone.
I am not familiar with the term "tas sensitief" and therefore cannot comment.
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