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European Journal of Applied Physiology

Published in:

01-05-2018 | Original Article

Fluid intake restores retinal blood flow early after exhaustive exercise in healthy subjects

Authors: Tsukasa Ikemura, Katsuhiko Suzuki, Nobuhiro Nakamura, Koichi Yada, Naoyuki Hayashi

Published in: European Journal of Applied Physiology | Issue 5/2018

Abstract

Purpose

It remains unclear whether rehydration restores retinal blood flow reduced by exhaustive exercise. We investigated the effect of fluid intake on retinal blood flow after exhaustive exercise.

Methods

Blood flow in the inferior (ITRA) and superior temporal retinal arterioles (STRA) was measured before and after incremental cycling exercise until exhaustion in 13 healthy males. After the exercise, the subjects rested without drinking (control condition: CON) or with drinking an electrolyte containing water (rehydrate condition: REH) and were followed up for a period of 120 min. To assess the hydration state, the body mass was measured, and venous blood samples were collected and plasma volume (PV) was calculated.

Results

Body mass decreased in CON after the trial [− 1.1 ± 0.1% (mean ± SE), p < 0.05]. PV was lower in CON than in REH during recovery. The ITRA and STRA blood flows decreased immediately after exercise from the resting baseline (ITRA; − 23 ± 4% in REH and − 30 ± 4% in CON, p < 0.05). The ITRA blood flow recovered baseline level at 15 min of recovery in REH (− 9 ± 3%, p = 0.5), but it remained reduced in CON (-14 ± 3%, p < 0.05). The STRA blood flow was higher in REH than in CON at 15 min (2 ± 3 vs. − 5 ± 3%, p < 0.05).

Conclusions

The results of this study suggest that the reduction in retinal blood flow induced by exhaustive exercise can be recovered early by rehydration.

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Title: Fluid intake restores retinal blood flow early after exhaustive exercise in healthy subjects
Authors: Tsukasa Ikemura
Katsuhiko Suzuki
Nobuhiro Nakamura
Koichi Yada
Naoyuki Hayashi
Publication date: 01-05-2018
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 5/2018
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-018-3839-6

At a glance: The STEP trials

Springer Medicine

Fluid intake restores retinal blood flow early after exhaustive exercise in healthy subjects

Abstract

Purpose

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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