What are the two phases of isotonic movement?

The two phases of isotonic movement are best described as contraction and extension. In isotonic movements, the muscle length changes while the tension remains constant. This occurs in two primary phases:

1. Contraction phase: During this phase, the muscle fibers shorten, generating force to lift or move a load. This is when the muscle actively engages and produces the necessary power for movement.

2. Extension phase: This phase involves the lengthening of the muscle as it returns to its resting state or continues to move the load. Muscles can resist or control the load through a controlled elongation, which is essential for smooth, effective movement and to prevent injury.

Understanding these phases helps in training and rehabilitation, as well as in the development of effective exercise programs that utilize isotonic movements for strength-building and functional fitness.