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| | THE MERCK MANUAL, Sec. 14, Ch. 179, Disorders Of Movement |
 | | Tremors are classified according to their rate (slow, 3 to 5 Hz; rapid, 6 to 12 Hz), amplitude, rhythm, distribution, and time of occurrence--at rest (resting tremor) or during muscular activity (sustention or intention tremors). |
 | | Sustention tremor, a coarse rotatory tremor of the proximal musculature, is most prominent when attempting to maintain a fixed posture or when weight bearing. |
 | | Titubation, a gross tremor of the head and body, is a form of sustention tremor evident when assuming the upright position; it disappears with recumbency. |
| www.merck.com /pubs/mmanual/section14/chapter179/179b.htm (452 words) |
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