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. 2017 May 11;123(1):260–266. doi: 10.1152/japplphysiol.00091.2017

Fig. 3.

Fig. 3.

Tympanic membrane displacement (TMD) during sitting, supine, HDT, and HDT + LBNP at −25 and −50 mmHg conditions. The direction of the TMD is inversely related to the intracranial pressure (ICP) level. Therefore, for graphical clarity the noninvasive ICP TMD is expressed as –nl (−1 × nl). Noninvasive ICP significantly increased from sitting to supine to HDT posture. However, application of 25 and 50 mmHg LBNP significantly reduced noninvasive TMD measures of ICP. TMD in the sitting posture was significantly different from all other postures/tilt angles. **However, application of 25 and 50 mmHg LBNP significantly reduced noninvasive TMD measures of ICP. *TMD in the sitting posture was significantly different from all other postures/tilt angles.