Muscle Contraction

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- Isometric Contraction:
    - w/ isometric (static) contraction, external muscle length does not change;
    - internally, however, within the fibril the distance between the Z-lines
          does shortens;
- Isotonic Contraction:
    - is one in which constant internal force is produced, & muscle shortens;
    - it is   also defined as a dynamic exercise with a constant load or resistance;
- Eccentric:
    - contraction is which external force is greater than internal force of the muscle,
          which causes the muscle to lengthen while continuing to maintain tension;
    - in eccentric contractions, movement is controlled but not initiated;
    - during an eccentric contraction, muscle can sustain greater tension
          than it can develop in isometric contraction at any given muscle length;
    - because greater tension is generated, these muscles are more vulnerable
          to rupture;
- Isokinetic Contraction:
    - term means "constant force" and typically is used to describe dynamic
          exercise performed through range of motion of joint at   constant velocity;
    - equipment used in isokinetic exercises accommodates the exerted force
          to maintain the specified velocity throughout the arc of motion;
    - because velocity does not change, the kinetic energy remains constant;
    - isokinetic contractions are not part of nl physiologic muscle function;