Ocular blood flow decreases during passive heat stress in resting humans

Tsukasa Ikemura, Akane Miyaji, Hideaki Kashima, Yuji Yamaguchi, Naoyuki Hayashi*

*この研究の対応する著者

研究成果査読

2 被引用数 (Scopus)

抄録

Background: Heat stress induces various physiological changes and so could influence ocular circulation. This study examined the effect of heat stress on ocular blood flow.Findings: Ocular blood flow, end-tidal carbon dioxide (PETCO2) and blood pressure were measured for 12 healthy subjects wearing water-perfused tube-lined suits under two conditions of water circulation: (1) at 35°C (normothermia) for 30 min and (2) at 50°C for 90 min (passive heat stress). The blood-flow velocities in the superior temporal retinal arteriole (STRA), superior nasal retinal arteriole (SNRA), and the retinal and choroidal vessels (RCV) were measured using laser-speckle flowgraphy. Blood flow in the STRA and SNRA was calculated from the integral of a cross-sectional map of blood velocity. PETCO2 was clamped at the normothermia level by adding 5% CO2 to the inspired gas. Passive heat stress had no effect on the subjects' blood pressures. The blood-flow velocity in the RCV was significantly lower after 30, 60 and 90 min of passive heat stress than the normothermic level, with a peak decrease of 18 ± 3% (mean ± SE) at 90 min. Blood flow in the STRA and SNRA decreased significantly after 90 min of passive heat stress conditions, with peak decreases of 14 ± 3% and 14 ± 4%, respectively.Conclusion: The findings of this study suggest that passive heat stress decreases ocular blood flow irrespective of the blood pressure or arterial partial pressure of CO2.

本文言語English
論文番号23
ジャーナルJournal of physiological anthropology
32
1
DOI
出版ステータスPublished - 2013 12 6
外部発表はい

ASJC Scopus subject areas

  • 人的要因と人間工学
  • 生理学
  • 整形外科およびスポーツ医学
  • 人類学
  • 公衆衛生学、環境および労働衛生
  • 生理学(医学)

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