| Attenuation of force deficit after lengthening contractions in soleus muscle from trained rats. | |
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MedLine Citation:
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PMID: 10749815 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purposes of this study were 1) to determine the extent to which endurance training reduces the functional deficit induced by lengthening contractions in the soleus (Sol) muscle and 2) to determine whether young and old rats training at a comparable relative exercise intensity would demonstrate a similar protective effect from lengthening-contraction-induced injury. Young (3-mo-old) and old (23-mo-old) male Fischer 344 rats were randomly assigned to either a control or exercise training group [young control (YC), old control (OC), young trained (YT), old trained (OT)]. Exercise training consisted of 10 wk of treadmill running (15% grade, 45 min/day, and 5 days/wk) such that by the end of training the young and old rats were exercising at 27 and 15 m/min, respectively. After training, contractile properties of the Sol muscle were measured in vitro at 26 degrees C. The percent decrease in maximal isometric specific force (P(o)) was determined after a series of 20 lengthening contractions (20% strain from optimal muscle length, 1 contraction every 5 s). After the lengthening-contraction protocol, Sol muscle P(o) was decreased by approximately 26% (19.6 vs. 14.6 N/cm(2)) and 28% (14.8 vs. 9.6 N/cm(2)) in the YC and OC rats, respectively. After exercise training, the reduction in P(o) was significantly (P < 0.05) attenuated to a similar degree ( approximately 13%) in both YT rats (18.7 vs. 16.2 N/cm(2)) and OT rats (15.8 vs. 13.7 N/cm(2)). It is concluded that exercise training attenuates the force deficit after repeated lengthening contractions to a comparable extent in young and old rats training at a similar exercise intensity. |
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Authors:
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L E Gosselin |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 88 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2000 Apr |
Date Detail:
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Created Date: 2000-05-17 Completed Date: 2000-05-17 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1254-8 Citation Subset: IM; S |
Affiliation:
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Department of Physical Therapy, Exercise, and Nutrition Sciences, State University of New York at Buffalo, Buffalo, NY 14214, USA. gosselin@acsu.buffalo.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aging
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physiology* Animals Isometric Contraction / physiology Male Muscle Contraction / physiology* Muscle Development Muscle, Skeletal / growth & development, physiology* Physical Conditioning, Animal / physiology* Physical Endurance Rats Rats, Inbred F344 |
| Grant Support | |
ID/Acronym/Agency:
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HD-0743/HD/NICHD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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