Furthermore, if the muscle length shortens, the contraction is concentric. But if the muscle length lengthens, then the contraction is eccentric. In natural movements that underlie locomotor activity, muscle contractions are multifaceted as they are able to produce changes in length and tension in a time-varying manner.uscle contractions can be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same.
Top definition. gut-wrenching. Adjective to describe something so painfully emotional, and tragic, that your stomach feels knotted. It relates to feelings of guilt, sadness and devastated sympathy. The really tragic suicide of ten year old Ashlynn Conner, from Illinois, suffering after being bullied, was described as 'gut-wrenching'. #devastated#heartbroken#shocked#horrified#disturbed#horrific#dreadful#gut wrenching#heart wrenching.
Written By: Wrench, also called spanner, tool, usually operated by hand, for tightening bolts and nuts. Basically, a wrench consists of a stout lever with a notch at one or both ends for gripping the bolt or nut in such a way that it can be twisted by a pull on the wrench at right angles to the axes of the lever and the bolt or nut.