According to Springfield Technical Community College, isotonic contraction occurs when a muscle length changes and causes movement of a body part. As Wikipedia explains, the name isotonic implies that the tension in the muscle during the movement remains unchanged.
There are two types of isotonic contractions, according to Wikipedia: concentric and eccentric. During a concentric contraction, the external force applied is lesser than the force generated by the muscle, resulting in shortening. During an eccentric contraction, the external force is greater than the muscle force, causing the muscle to lengthen. Isotonic contractions are present in all lifting exercises and almost all physical activities, including eccentric tension-stimulated muscle strengthening.Learn More
"Quiet inspiration" is the intake of air into the lungs via the contraction of the diaphragm and external intercostal muscles only, while "quiet expiration" is output of air from the lungs by relaxing these same muscles. They stand in contrast to forced inspiration and expiration. In forced inspiration, extra accessory muscles are used to take in air faster, while in forced expiration abdominal and other muscles force air out faster.Full Answer >
According to MedicineNet, muscles respond to exercise through contraction and resistance, both of which eventually result in increased muscular strength. Neural impulses direct fibers to contract, resulting in voluntary exercise. There are three different types of muscles that are worked during exercise, including skeletal, smooth and cardiac muscle, and each one responds differently to physical exercise.Full Answer >
Muscles produce movement through contraction. The muscle contraction associated with movement is called an isotonic contraction. When a muscle contracts with no resulting movement, it is called an isometric contraction.Full Answer >
Boundless defines an isometric contraction as a contraction against a constant resistance. Basically, this means that the muscle is not changing in length or moving at the joints, but it is still contracting.Full Answer >