Changes in cardiac function in Navy divers during four days of successive dives in very cold diving conditions

Author:

Lundell Richard1ORCID,Järvinen Vesa2,Mäkitalo Harri3,Parkkola Kai4,Wuorimaa Tomi3

Affiliation:

1. Field Medicine Unit, Centre for Military Medicine Finnish Defence Forces Helsinki Finland

2. Department of Clinical Physiology and Nuclear Medicine, HUS Medical Imaging Center Helsinki University Central Hospital Helsinki Finland

3. Diving Medical Centre, Field Medicine Unit, Centre for Military Medicine Finnish Defence Forces Kirkkonummi Finland

4. Department of Leadership and Military Pedagogy National Defence University Helsinki Finland

Abstract

AbstractIntroduction and MethodsThere is limited knowledge of cumulative effect of repetitive cold‐water diving on cardiac function. Single cold dives cause some known cardiological risks, such as malign arrhythmia, due to a concurrent activation of the sympathetic and parasympathetic autonomic nervous system. A previous study from warmer water dives has shown that successive dives cause a decrease in vagal tone and a less responsive cardiovascular system. The aim of this study was to evaluate changes in cardiac function with 2D echocardiography during 4 days of diving in near‐freezing water.ResultsLeft ventricle systolic function measures did not show any uniform changes. E/A ratio seemed to decrease successively with the number of dives. The diastolic tissue velocity of relaxing basal septum (e′) showed a decreasing trend as well. Diastolic blood pressure seemed to increase from predive (mean: 83 RR mmHg) to postdive values (mean: 87 RR mmHg) (p=NS). Heart rate decreased significantly from predive (mean: 71 bpm, range: 56–103) to postdive values (mean: 60 bpm, range: 37–88) (p < 0.03).Discussion and ConclusionsThe study was conducted in very cold condition and with limited number of divers. Results of this preliminary study suggested a decreasing trend in left ventricular diastolic function in successive cold dives. Cumulative changes in cardiac function may cause health risks that need to be considered during cold water diving operations.

Publisher

Wiley

Subject

Physiology (medical),General Medicine,Physiology,General Medicine

Reference27 articles.

1. Cold‐induced cutaneous vasoconstriction in humans: Function, dysfunction and the distinctly counterproductive

2. Hemodynamic changes in man during immersion with the head above water;Arborelius M;Aerospace Medicine,1972

3. Effects of prolonged and repeated immersions on heart rate variability and complexity in military divers

4. Thermal status of Antarctic divers;Bridgman S.A.;Aviation, Space, and Environmental Medicine,1990

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3