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. Author manuscript; available in PMC: 2014 Oct 14.
Published in final edited form as: J Neurol Neurosurg Psychiatry. 2010 Jul 26;82(1):98–104. doi: 10.1136/jnnp.2009.199208

Figure 2.

Figure 2

(A) Movements of the centre of gravity in a healthy control subject during the Dix–Hallpike manoeuvre. The peaks of the trace during movements to and from the head-hanging position are due to the supporting effects of a pillow under the subject’s back. The movements after the second peak were analysed further to assess trunk oscillation elicited by sitting up (see figure 1). The arrow shows the time interval of the movement of centre of pressure during the act of sitting up from the Dix–Hallpike position. (B) Patient 1, Sitting up from the side with vertigo. Posturographic traces of a typical patient with Type 2 BPPV (Patient 1) during the act of sitting up from the Dix–Hallpike manoeuvre. When sitting up from the right Dix–Hallpike head-hanging position, the patient’s trunk oscillated along the anterior–posterior direction (Fosc=69%), but not when sitting up from the left head-hanging position (Fosc=14%). (C) Patient 1, Sitting up from the side without vertigo. There is no trunk oscillation.