MUSCLE PHYSIOLOGY

Detailed explanation-1: -An isometric contraction generates force without changing the length of the muscle, and no mechanical work is done since the muscle does not shorten. However, this type of contraction requires high amounts of energy because of the force generated by the muscle.

Detailed explanation-2: -Isometric contraction: A muscle contracts, but the joint it controls does not move. Think of holding a weight with your elbow bent to 90 degrees and does not move. Isotonic contraction: A muscle contracts and the joint angle it controls increases and decreases while the muscle either shortens or lengthens.

Detailed explanation-3: -In a concentric contraction, the muscle tension rises to meet the resistance then remains stable as the muscle shortens. During eccentric contraction, the muscle lengthens as the resistance becomes greater than the force the muscle is producing.