Abstract
The effects of passive heat stress (PHS) on ocular blood flow were investigated by measuring the ocular blood flow, end‐tidal CO2 (PETCO2), and blood pressure in 12 healthy subjects who were passively heated for 90 min by perfusing 50°C water through the suit. The blood flows in the superior temporal retinal arteriole (STRA) and the retinal and choroidal vessels (RCV) were measured by laser speckle flowmetry every 30 min during PHS. PETCO2 was clamped at the resting level by adding 5% CO2 to the inspired gas. The blood pressure did not change significantly throughout the induced PHS. The blood flow in the RCV decreased significantly from the resting baseline at 30, 60, and 90 min after the onset of PHS, with a peak decrease of 18±1% (mean±SE) at 90 min. The blood flow in the STRA decreased significantly at 60 and 90 min, with a peak decrease of 12±2% at 90 min. These findings suggest that PHS decreases ocular blood flow without changing the blood pressure or PaCO2.
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