1. 
   Concentric Contraction
   An isotonic muscle contraction, where a muscle contracts or shortens.
   Found op http://www.netfit.co.uk/glossary/fitness-glossary-c.htm
   
   
2. 
   Concentric contraction
   Contraction of a muscle reducing its length.
   Found op http://www.felpress.co.uk/Exercise_Physiology_Glossary.24.0.html
   
   
3. 
   concentric contraction
   shortening contraction.
   Found op http://www.encyclo.co.uk/local/21001
   
   
4. 
   concentric contraction
   Type: Term Definitions: 1. muscular contraction producing movement as the result of shortening or decreasing the length of the muscle.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=20102
   
   
5. 
   Concentric Muscle Contraction
   A shortening of the muscle as it develops tension and contracts to move a resistance.
   Found op http://www.encyclo.co.uk/local/20906
   
   

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