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S. O. Semb, E. F. Bakke; Intraocular Pressure Changes Measured Continuously During Isometric Exercise. Invest. Ophthalmol. Vis. Sci. 2007;48(13):3948.
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Isometric (static) exercise induces an exercise pressor response with a characteristic increase in blood pressure. In this study we wanted to examine the continuously changes of intraocular pressure (IOP), finger arterial blood pressure (BP) and heart rate (HR) before, during and immediately after isometric exercise.
Nine healthy young subjects participated, three females and six males. BP, HR and IOP were continuously recorded at 300 Hz before, during and after 2 min of 40% maximum voluntary contraction of the forearm. Finger arterial pressure was acquired by a photoplethysmographic pressure measuring device (Finometer, Finapres Medical Systems BV, Amsterdam, The Netherlands). IOP was continuously recorded from the subjects left eyes with an ocular dynamic tonometry (an electronic Schiøtz tonometer).
Mean IOP before exercise was 12 mmHg (± SD, ± 2.7). During the 2 min of exercise heart rate increased from 74 ± 18 to 93 ± 18 Hz (P<0.003) and systolic and diastolic arterial pressure increased from 125 ± 19 to 158 ± 13 (P<0.001) and 65 ± 10 to 91 ± 13 mmHg (P<0.001), respectively. IOP measured decreased 9% during the same time period. During recovery IOP fell 16% in 14 ± 6.2 s (P<0.001). IOP fell almost parallel with arterial pressure.
Continuous measurement of IOP during isometric exercise showed a slight decrease compared to pre exercise values. Immediately after isometric exercise IOP fell steeply in parallel with arterial pressure.
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