
(from the article `muscle`) When a muscle is to lift a constant load (isotonic conditions) after stimulation starts, the force increases, just as in an isometric contraction, ...
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http://www.britannica.com/eb/a-z/i/45

Contraction of a muscle, the tension remaining constant. Since the contractile force is proportional to the overlap of the filaments and the overlap is varying, the numbers of active cross bridges must be changing. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

muscle contraction without appreciable change in the force of contraction; the distance between the origin and insertion becomes lessened. See illustration at isometric contraction.
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http://www.encyclo.co.uk/local/21001

Contraction of a muscle, the tension remaining constant. Since the contractile force is proportional to the overlap of the filaments, and the overlap is varying, the numbers of active cross-bridges must be changing.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Definitions: 1. shortening at constant force development. Synonyms: isotonic exercise
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http://www.medilexicon.com/medicaldictionary.php?t=20113

(i;suo-ton;ik) Muscle contraction in which the muscle shortens in length and maintains approximately the same amount of tension throughout the shortening process.
Found on
http://www.mhhe.com/biosci/abio/glossary.mhtml
No exact match found.