MUSCLE PHYSIOLOGY

Detailed explanation-1: -Types of Muscle Contraction: An isotonic concentric contraction results in the muscle shortening, an isotonic eccentric contraction results in the muscle lengthening. During an isometric contraction the muscle is under tension but neither shortens nor lengthens.

Detailed explanation-2: -During an isometric contraction the muscle is under tension but neither shortens nor lengthens.

Detailed explanation-3: -In an isometric muscle contraction, the muscle fires (or activates with a force and tension) but there is no movement at a joint. In other words, the joint is static; there is no lengthening or shortening of the muscle fibers and the limbs don’t move.

Detailed explanation-4: -During the course of ‘isometric’ contractions, the muscle fibres shortened by stretching the compliant tendons, until the muscle fibres could no longer produce enough force to stretch the tendons further. At optimal muscle length (Lo) the maximal shortening of muscle fibres was 28%.

Detailed explanation-5: -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.