Flow velocity in carotid artery in humans during immersions and underwater swimming

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Flow velocity in carotid artery in humans during immersions and underwater swimming

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Title: Flow velocity in carotid artery in humans during immersions and underwater swimming
Author: Jiang, ZL; He, J; Miyamoto, H; Tanaka, H; Yamaguchi, H; Kinouchi, Y
Abstract: Heart rate and flow velocity in the common carotid artery were examined on eight subjects in various underwater conditions. The heart rate decreased more markedly during whole-body immersion than during head-out immersion. The end-diastolic flow velocity and the flow-velocity integral in a cardiac cycle during whole-body immersion increased more markedly than during head-out immersion. Differences in heart rate and flow velocity were not detected between sitting and prone positions in whole-body immersion. Heart rate increased at the beginning and after underwater swimming. The peak systolic flow velocity increased significantly after the end of underwater swimming. The flow-velocity integral in a cardiac cycle decreased during underwater swimming, but in a minute did not change significantly. These results suggest that facial immersion is important in eliciting pronounced carotid artery flow-velocity response in addition to the heart-rate response and that underwater exercise influences these responses. However, underwater posture apparently does not influence them.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: PMID: 8061557
http://archive.rubicon-foundation.org/2158
Date: 1994

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