To grade muscle tone, you must first know what muscle tone is. Myotonia is the ability of human muscles to maintain a certain state of tension in a state of quiet rest, called muscle tone, it is not what we usually think of muscle strength. It is not what we usually think of as muscle strength. muscle tone is generally classified into 5 levels, firstly, level 0, which is the level of floppy, that is, the limb does not respond at all to passive activities, this is called muscle tone level 0. level 1, hypotonia, the response of the limb to passive activities is reduced, when the limb is subjected to passive activities the response is very weak. level 2 is normal, that is, the limb has a normal response to passive activities, there is a certain slight normal tone, this is the normal state, so level 2 is normal. Level 3 is a mild to moderate increase, that is, when the passive limb is completely relaxed, the limb will feel a resistance response, this situation is called level 3. level 4 is a severe increase, the passive limb has a continuous response, the subject is completely relaxed, the passive limb will feel the whole limb from the whole process of activity, from beginning to end This condition is called severe hyperactivity, and this is the classification of muscle tone.