- 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