Table 1.
Types of tremors and their electrophysiological parameters.
| Frequency range | Components |
EMG Left-Right coherence | Other | |||
|---|---|---|---|---|---|---|
| Mechanical | Mechanical reflex | Central | ||||
| Physiological Tremor | 6–12 Hz | Main component | No | May have a small 8–12 Hz | No | Usually asymptomatic |
| Enhanced Physiological Tremor | 4–12 Hz | Main component | Main Component | May have a small 8–12 Hz | No | The main component may be mechanical or mechanical reflex |
| Essential tremor | 4–12 Hz | Small component | No | Main Component | No | There is an inverse correlation between the frequency and age |
| Functional tremor | Variable, 6–11 Hz | Small component | No | Main Component | Sometimes | Variable and distractible |
| Orthostatic tremor | 13–18 Hz | Small component | No | Main Component | Always | Only when standing |
| Parkinson tremor | 4–6 Hz | Small component | No | Main Component | No | Two types of posture tremor, re-emergent (same frequency as rest) and no re-emergent. |