| Control and quantitation of voluntary weight-lifting performance of rats. | |
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MedLine Citation:
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PMID: 12665538 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present paper describes an exercise model that produces a voluntary hindlimb weight-lifting response. Each rat was operantly conditioned to enter a vertical tube, insert its head into a weighted ring (either 70 g or 700 g), lift the ring until its nose interrupted an infrared detector, and then lower the ring. Load cells measured the external force generated, and displacement transducers measured the vertical displacement of the ring during each lifting and lowering movement. The apparatus and training procedures were computer automated. Peak force, velocity, work, and power were calculated for each movement. Rats in both groups easily acquired the task after 12-15 training sessions, on average, conducted 5 days/wk. Once rats were trained, the lifting patterns were quite stable during several more weeks of posttraining exercise; however, the lighter 70-g load gave rise to more variable performances across rats. Results demonstrate the utility of quantitating the biomechanics of volitional movements and suggest that the present model can establish and maintain controlled repetitive movements necessary for studies of adaptation and/or injury in muscles, tendon, and bone. |
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Authors:
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Oliver Wirth; Erik W Gregory; Robert G Cutlip; G Roger Miller |
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Publication Detail:
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Type: Journal Article Date: 2003-03-28 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 95 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2003 Jul |
Date Detail:
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Created Date: 2003-06-09 Completed Date: 2004-02-02 Revised Date: 2008-11-21 |
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: 402-12 Citation Subset: IM |
Affiliation:
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Centers for Diseases Control Prevention and National Institute for Occupancy Safety and Health, Morgantown, WV 26505, USA. owirth@cdc.gov |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biomechanics Conditioning, Operant / physiology Hindlimb / physiology* Joints / physiology Male Movement / physiology Muscle, Skeletal / physiology* Physical Exertion / physiology* Rats Rats, Sprague-Dawley Reinforcement (Psychology) Transducers, Pressure |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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