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      Beziehungen zwischen Trainingszustand und Orthostasetoleranz

      Cardiology

      S. Karger AG

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          Abstract

          Investigations on orthostatic tolerance and physical fitness prior to and after 6-8 h immersion experiments surprisingly revealed that all untrained subjects endured pre- and postimmersion tilt table tests without subjective complaints, whereas after immersion all trained participants collapsed within the first minutes of erect position displaying symptoms of a vasovagal syncope. Assuming that this impaired orthostatic tolerance of trained subjects can partially be referred to influences of an altered blood pressure control system we decided to record the blood pressure characteristics of both groups. Thereby, the transmural pressure of the carotid artery was changed by applying from outside either reduced or exceeding pressures. The controller sensitivity in the untrained group was almost twice as high as in the trained one. This implies a better regulatory response to disturbing interference in the untrained. Under normal conditions the controlling capacity of both groups is sufficient to cope with body position changes. However, during stress situations--in this case, reduction of aldosterone concentration as well as losses of plasma volume due to the 'Gauer-Henry-Reflex'--blood pressure regulation first fails in the trained subjects.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          978-3-8055-2260-1
          978-3-318-01900-1
          0008-6312
          1421-9751
          1976
          1976
          12 November 2008
          : 61
          : Suppl 1
          : 255-266
          Affiliations
          Physiologisches Institut der Deutschen Sporthochschule Köln, Köln
          Article
          169816 Cardiology 1976;61:255–266
          10.1159/000169816
          975140
          © 1976 S. Karger AG, Basel

          Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

          Page count
          Pages: 12
          Categories
          Session III. Clinical Aspects of Orthostatic Dysregulation

          General medicine, Neurology, Cardiovascular Medicine, Internal medicine, Nephrology

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