Question

explain the relationship between torque and change in muscle length. Torque vs concentric, Torque vs isometric. Torque vs eccentric..

Answer 1

There are mainly two types of isotonic muscle contractions. Concentric and eccenteric contractions. In both cases , the muscle changes length at constant tension.

Concenteric contractions-

In this type of muscle contraction, the muscle shortens. Example biceps muscle is shortening while contracting n case of lifting a dumbell.

Eccenteric Contractions-

In this type of muscle contraction, the muscle lengthens because it is being stretched by an external force while coontracting. With this, the contractile activity is resistig the stretch. example, lowering a load to the ground. during this action, the muscle fibers in the biceps are lengthening but are still contracting in opposition to being stretched. this tension produced supports the weight of the object.

Torque depends on the tension applied and long arc distance. Here, as said earlier, in here, there is no change in tension, so torque depends o only only long arc distance. which is greater for eccenteric contraction and lower for concenteric contraction. So, torque will be greater in eccenteric and lower in concenteric contraction.