izomkontrakció

Isomkontrakció, also known as isometric contraction, is a type of muscle contraction that occurs when a muscle generates force without changing its length or the angle of the joint it crosses. In an isomkontrakció, the tension within the muscle increases, but the muscle fibers do not shorten or lengthen. This type of contraction is crucial for maintaining posture and stabilizing joints.

During an isomkontrakció, the actin and myosin filaments within the muscle sarcomeres slide past each other, creating tension. However, the external load or resistance is equal to the force produced by the muscle, preventing any movement. Imagine holding a heavy object still; your muscles are contracting isometrically to counteract gravity.

Examples of isomkontrakció can be observed in everyday activities. When you stand, the muscles in your legs and back contract isometrically to keep you upright. Similarly, when you push against an immovable object, your muscles are engaging in an isomkontrakció. This type of contraction is often used in physical therapy and strength training to build muscle strength and endurance without causing joint stress or excessive movement. It is distinct from isotonic contraction, where the muscle changes length, either shortening (concentric) or lengthening (eccentric).