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Originally published In Press as doi:10.1167/iovs.08-2508 on October 3, 2008
 (Investigative Ophthalmology and Visual Science. 2009;50:760-764.)
© 2009 by The Association for Research in Vision and Ophthalmology, Inc.
doi:10.1167/iovs.08-2508
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Intraocular Pressure Increases in Parallel with Systemic Blood Pressure during Isometric Exercise

Espen F. Bakke,1 Jonny Hisdal,2 and Svein O. Semb1

1From the Center for Eye Research, University of Oslo, Department of Ophthalmology, Ullevål University Hospital, Oslo, Norway; and the 2Department of Vascular Diagnosis and Research, University of Oslo, Aker University Hospital, Oslo, Norway.

PURPOSE. Normal-tension glaucoma has been found to be related to transient increases in intraocular pressure (IOP). Isometric exercise induces a pressor response with a characteristic increase in blood pressure. The purpose of the present study was to investigate how transient changes in systemic blood pressure, induced by isometric exercise, affect IOP.

METHODS. Nine healthy volunteers participated in the study. Systemic blood pressure, heart rate (ECG) and IOP (electronic continuous-indentation tonometer) were recorded continuously before, during, and after a 2-minute period of isometric exercise (40% maximum voluntary contraction of the forearm).

RESULTS. During the 2-minute isometric exercise, heart rate increased from 74 ± 6 beats/min (mean ± SEM) to 93 ± 6 beats/min (P < 0.005) and systolic and diastolic arterial blood pressure increased from 125 ± 6 to 169 ± 8 mm Hg (P < 0.005) and from 65 ± 3 to 96 ± 5 mm Hg (P < 0.005), respectively. IOP increased from 15 ± 1 mm Hg at rest to 19 ± 2 mm Hg at the end of the isometric exercise (P < 0.005).

CONCLUSIONS. During isometric exercise, IOP increased continuously, as long as the isometric exercise persisted, in parallel to the increase in systemic blood pressure.




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