Login to MyKarger

New to MyKarger? Click here to sign up.



Login with Facebook

Forgot your password?

Authors, Editors, Reviewers

For Manuscript Submission, Check or Review Login please go to Submission Websites List.

Submission Websites List

Institutional Login
(Shibboleth or Open Athens)

For the academic login, please select your country in the dropdown list. You will be redirected to verify your credentials.

Muscle Energetics and Ultrastructure in Chronic Hypoxia

Cerretelli P.

Author affiliations

Départment de Physiologie, CMU, Genève, Suisee

Related Articles for ""

Respiration 1992;59:24–29

Do you have an account?

Login Information





Contact Information











I have read the Karger Terms and Conditions and agree.



Login Information





Contact Information











I have read the Karger Terms and Conditions and agree.



To view the fulltext, please log in

To view the pdf, please log in

Buy

  • FullText & PDF
  • Unlimited re-access via MyKarger
  • Unrestricted printing, no saving restrictions for personal use
read more

CHF 38.00 *
EUR 35.00 *
USD 39.00 *

Select

KAB

Buy a Karger Article Bundle (KAB) and profit from a discount!

If you would like to redeem your KAB credit, please log in.


Save over 20% compared to the individual article price.
Learn more

Rent/Cloud

  • Rent for 48h to view
  • Buy Cloud Access for unlimited viewing via different devices
  • Synchronizing in the ReadCube Cloud
  • Printing and saving restrictions apply

Rental: USD 8.50
Cloud: USD 20.00


Select

Subscribe

  • Access to all articles of the subscribed year(s) guaranteed for 5 years
  • Unlimited re-access via Subscriber Login or MyKarger
  • Unrestricted printing, no saving restrictions for personal use
read more

Subcription rates


Select

* The final prices may differ from the prices shown due to specifics of VAT rules.

Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: January 20, 2009
Issue release date: 1992

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 0025-7931 (Print)
eISSN: 1423-0356 (Online)

For additional information: https://www.karger.com/RES

Abstract

High-altitude exposure impairs both maximal aerobic and anaerobic (lactic and alactic) performances. The maximal aerobic power (VO2max) decreases exponentially with increasing altitude. At 5,350 m, a sudden rise in inspired O2 pressure (PIO2) was found to raise the VO2max of acclimatized lowlanders from 70 to only 92% of the control sea-level value. Since the hemoglobin concentration was about 35% higher than that of the controls, hemoglobin O2 saturation was restored to about 100% and maximal cardiac output was only 10-20% lower than at sea level, the above result can only be the consequence: (1) of a reduced muscle mass and/or of muscle deterioration, and (2) of impaired muscle perfu-sion. In muscle biopses taken from the vastus lateralis muscles of mountaineers after a 6- to 8-week sojourn at high altitude, a reduction in the fiber cross-sectional area was found which was accompanied by a decrease in the volume density of the mitochondria and by a lower tissue oxidative capacity. In acclimatized lowlanders, the maximal blood lactate concentration after exhausting exercise was halved compared to sea-level conditions. On the other hand, the peak anaerobic power was not affected by severe hypoxia within the first 3 weeks of exposure; thereafter, it decreased by about 25% probably as a consequence of muscle detorioration. It is concluded that, whereas in acute hypoxia VO2max is primarily reduced by a lack of O2, in chronic hypoxia muscle deterioration may become an important factor contributing to the limitation of the maximal aerobic performance.

© 1992 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: January 20, 2009
Issue release date: 1992

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 0025-7931 (Print)
eISSN: 1423-0356 (Online)

For additional information: https://www.karger.com/RES


Copyright / Drug Dosage / Disclaimer

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.