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Haemodynamic changes in man during immersion in water at different temperatures.

Clive Weston Orcid Logo, JP O'Hare

Clin Sci, Volume: 73, Issue: 6, Pages: 613 - 616

Swansea University Author: Clive Weston Orcid Logo

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Abstract

1. Stroke volume and cardiac output were measured using the Doppler ultrasound technique in 16 normal subjects immersed to the neck in water at 33 degrees C, 35 degrees C, 37 degrees C and 39 degrees C. A standard aortic diameter was assumed and results were expressed as percentage changes from pre-...

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Published in: Clin Sci
ISSN: PMID: 3319357
Published: 1987
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URI: https://cronfa.swan.ac.uk/Record/cronfa33802
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spelling 2017-05-21T12:57:34.4232155 v2 33802 2017-05-21 Haemodynamic changes in man during immersion in water at different temperatures. df85e4e0e139d0f46eb683174eba98a9 0000-0002-8995-8199 Clive Weston Clive Weston true false 2017-05-21 MEDS 1. Stroke volume and cardiac output were measured using the Doppler ultrasound technique in 16 normal subjects immersed to the neck in water at 33 degrees C, 35 degrees C, 37 degrees C and 39 degrees C. A standard aortic diameter was assumed and results were expressed as percentage changes from pre-immersion resting values. 2. Cardiac output rose progressively at higher temperatures, increasing by 30% at 33 degrees C and by 121% at 39 degrees C. At thermoneutral temperatures (33 degrees C and 35 degrees C) this was achieved by an increase in stroke volume of 50% despite a significant decrease in heart rate. There was a further rise in stroke volume and pulse rate at higher temperatures and a mean tachycardia of 109 +/- 4 beats/min was noted at 39 degrees C. Calculated peripheral resistance reduced progressively with increasing temperature of immersion. 3. This non-invasive and simple technique may provide a non-exercise-related cardiovascular stress test to study cardiovascular responses in a variety of pathophysiological states. Journal Article Clin Sci 73 6 613 616 PMID: 3319357 1 12 1987 1987-12-01 COLLEGE NANME Medical School COLLEGE CODE MEDS Swansea University 2017-05-21T12:57:34.4232155 2017-05-21T12:57:34.4544186 Faculty of Medicine, Health and Life Sciences Swansea University Medical School - Medicine Clive Weston 0000-0002-8995-8199 1 JP O'Hare 2
title Haemodynamic changes in man during immersion in water at different temperatures.
spellingShingle Haemodynamic changes in man during immersion in water at different temperatures.
Clive Weston
title_short Haemodynamic changes in man during immersion in water at different temperatures.
title_full Haemodynamic changes in man during immersion in water at different temperatures.
title_fullStr Haemodynamic changes in man during immersion in water at different temperatures.
title_full_unstemmed Haemodynamic changes in man during immersion in water at different temperatures.
title_sort Haemodynamic changes in man during immersion in water at different temperatures.
author_id_str_mv df85e4e0e139d0f46eb683174eba98a9
author_id_fullname_str_mv df85e4e0e139d0f46eb683174eba98a9_***_Clive Weston
author Clive Weston
author2 Clive Weston
JP O'Hare
format Journal article
container_title Clin Sci
container_volume 73
container_issue 6
container_start_page 613
publishDate 1987
institution Swansea University
issn PMID: 3319357
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str Swansea University Medical School - Medicine{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}Swansea University Medical School - Medicine
document_store_str 0
active_str 0
description 1. Stroke volume and cardiac output were measured using the Doppler ultrasound technique in 16 normal subjects immersed to the neck in water at 33 degrees C, 35 degrees C, 37 degrees C and 39 degrees C. A standard aortic diameter was assumed and results were expressed as percentage changes from pre-immersion resting values. 2. Cardiac output rose progressively at higher temperatures, increasing by 30% at 33 degrees C and by 121% at 39 degrees C. At thermoneutral temperatures (33 degrees C and 35 degrees C) this was achieved by an increase in stroke volume of 50% despite a significant decrease in heart rate. There was a further rise in stroke volume and pulse rate at higher temperatures and a mean tachycardia of 109 +/- 4 beats/min was noted at 39 degrees C. Calculated peripheral resistance reduced progressively with increasing temperature of immersion. 3. This non-invasive and simple technique may provide a non-exercise-related cardiovascular stress test to study cardiovascular responses in a variety of pathophysiological states.
published_date 1987-12-01T04:05:11Z
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score 11.096212

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