Answer
Isometric contraction of a muscle is contraction without change in length.
Examples are holding the plank posture in Yoga
Standing stationary and holding a fairly heavy object in front of you without moving or lifting it for 20 -30
seconds
Work Step by Step
Isotonic contraction. Contraction of muscle with a change in length but no change in tension.
This kind of contraction occurs in many ordinary gym exercises such as squats, push-ups and pull-downs on resistance machines
First, internal tension builds until it overcomes resistance; then the muscle shortens, moves the load and maintains the same tension.
