The concentric phase, or take-off phase, is one of three parts of a plyometric exercise. This phase is the response to the eccentric and amortization phases. During this phase, elastic energy is utilized to increase the force of the subsequent movement or is dissipated as heat. The force is increased beyond that in isolated concentric muscular action. An example of this is the explosion out of the bottom portion of a squat jump into the jump itself. The time between landing and the bottom portion is called the eccentric phase. The time between is called the amortization phase.
- McNeely/Sandler 2007, p.13.
- Baechle/Earle 2000, p.430.