The electrically evoked contractile properties of the triceps surae and short-term ( < 2 s) maximal power output during vertical jumping have been examined before and after heating (by water immersion) in 5 elderly men aged 70 ± 5 years. Leg immersion in water at 44°C for 30 min produced a 3.4°C rise in muscle temperature (Tm) and was associated with a significant (p < 0.001) reduction in maximal time to peak tension and half relaxation time of the twitch, but was without affect on maximal twitch, tetanic (20 and 50 Hz) and voluntary tensions. However, at 10 Hz maximal tetanic tension was reduced (p < 0.05) from 604 ± 104 to 422 ± 142 N. During vertical jumping from a force platform, peak power output (W) was significantly (p < 0.05) increased from 1,155 ± 212 to 1,381 ± 307 W after heating. The rise in W was due to a small increase in both take-off velocity and the exerted force, and was reflected in a 3-cm increase in the height jumped from the force platform. It is concluded that the contractile characteristics of elderly triceps surae can be modified by heating and a rise in Tm does effect a change in the capacity of the muscle to generate power.

This content is only available via PDF.
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.
You do not currently have access to this content.