Final answer:
The three phases of muscle contraction in plyometrics are a loading eccentric phase, a transitional amortization phase, and a concentric phase, which involves the muscle shortening to move a load, such as lifting a hand weight. Option 1 is correct.
Step-by-step explanation:
The SSC (Stretch-Shortening Cycle) of muscle contraction that drives plyometrics consists of three phases: a loading eccentric phase, a transitional amortization phase, and a concentric phase. The concentric phase is characterized by the shortening of the muscle to move a load.
This occurs, for example, when the biceps brachii muscle shortens while raising a hand weight, thereby decreasing the angle of the elbow joint.
On the other hand, an eccentric contraction involves the lengthening of the muscle under tension, such as when slowly lowering a hand weight, and an isometric contraction occurs when muscle tension changes but the muscle length stays the same. In the context of plyometrics, the concentric phase is critical for explosive movements as the muscle quickly shortens to produce force.
The SSC (Stretch-Shortening-Cycle) of muscle contraction driving plyometrics has three phases: a loading eccentric phase, a transitional amortization phase, and a concentric phase. In the concentric phase, the muscle shortens to move a load.
This is seen, for example, in the biceps brachii muscle contracting to lift a hand weight. As the muscle shortens, the angle of the joint decreases. The concentric phase is one of the types of isotonic contractions, where the muscle length changes as the load is moved.