isometric muscle activation
Isometric muscle activation is that which there is force generated against a load by which the muscle is attempting to contract, but no movement is generated (Faulkner, 2003). A.V. Hill (1938) found that, on a level of muscle physiology, isometric muscle activation actually does have properties of contraction. But on a mechanical basis, there is no displacement achieved, and so it is effectively labeled as having no net movement.