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  5. FP0062 : Effects of head posture on intraocular pressure and heart rate of human beings

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Chief Author: Dr.Shubhangi Gupta

Presenting Author: Dr.Aalok Kumar

Co Author(s): Prof. Dr. Deepak Mishra, Dr.TANMAY SRIVASTAV

Abstract

STUDY DESIGN This cross sectional study included 105 patients and analyzed association of head posture on intraocular pressure (IOP).
PURPOSE The study aimed to evaluate and measure the changes in IOP and heart rate (HR) of human beings on head‑down posture.
METHODS Patients underwent applanation tonometry and HR variability (HRV) analysis before and after 20 min of head‑down posture (approximately 20°).Paired t‑test and linear regression analysis were applied.
RESULTS After 20 min of the 20° head‑down position, an increase in IOP was significant from 15.0 ± 2.0 mmHg to 18.0 ± 2.3 mmHg (P < 0.001). A decrease in HR was also significant from 78 ± 10.48 bpm to 72 ± 10.52 bpm after the head‑down position for 20 min (P < 0.05).
CONCLUSION These outcomes presented the first evidence of the activation of the parasympathetic nervous system in the head‑down position which might cause decreased HR and the collapse of Schlemm’s canal lumen, which in turn leads to the increased IOP.