Retrobulbar blood flow and ophthalmic perfusion in maximum dynamic exercise

Abstract

Maximal physical exercise increases OPP and blood flow at the OA without affecting blood flow at the CRA and SPCA, implying that auto-regulative mechanisms are active in both retinal and choroidal circulations.

Physical exercise and glaucoma: a review on the roles of physical exercise on intraocular pressure control, ocular blood flow regulation, neuroprotection and glaucoma‐related mental health

“…The IOP reduction after 15 min of treadmill running at a speed of 6.5-8 km/h was 3.82 mmHg, with an additional decrease of 1.14 mmHg after 30 min (Hong et al 2014). Kozobolis et al (2008) reported an IOP reduction of 5.6 mmHg after 1 min on the treadmill, at an intensity reaching 85% of the heart rate, although the positive effect lasted no longer than 30 min. Cycling.…”

“…An elevation in OPP and blood flow (measured by colour Doppler imaging) at the ophthalmic artery but not in the central retinal artery or short posterior ciliary arteries was demonstrated after 30 min of exercise on the treadmill by Kozobolis et al., suggesting that autoregulation was involved in both retinal and choroidal circulations (Kozobolis et al. ). Okuno's group found that the retinal OBF [measured by scanning laser Doppler flowmetry (LDF)] increased immediately after 6 min of Master's double two‐step test, but returned to the baseline at 30 min postexercise, while the choroid–retinal blood flow [measured by laser speckle flowgraphy (LSFG)] continued to increase for 60 min (Okuno et al.…”

“…Kozobolis et al. () reported an IOP reduction of 5.6 mmHg after 1 min on the treadmill, at an intensity reaching 85% of the heart rate, although the positive effect lasted no longer than 30 min.…”

A comparison of the intraocular pressure response between two different intensities and volumes of resistance training

“…Table 1 Comparing IOP values for each RT and control time point in the right eye reduction during aerobic activities. (16,17) However, this evidence is not adequate to explain IOP reductions associated with RT because, as opposed to aerobic exercise, RT is an intermittent activity with lower cardiac output.…”

Choroidal blood flow regulation and possible implications to glaucoma

“…In this issue, Kozobolis et al . report the short‐term (1 and 30 min) effects of maximum dynamic physical exercise on retrobulbar blood flow and ocular perfusion pressure (OPP) in 30 young healthy males, using colour Doppler imaging 14 . This study found OPP and peak systolic velocity (PSV) in the ophthalmic artery to be significantly higher at the 1‐min interval, compared with the pretest scores ( P = 0.01, in both cases), normalizing to pre‐exercise levels on the 30‐min post‐treadmill test.…”