types of contractions Flashcards
what is a muscular contraction?
when a stimulus from the brain is sent to the muscle and tension is produced
what are the 2 types of muscular contractions?
isotonic and isometric
does movement occur in isotonic or isometric muscular contractions?
isotonic
describe isometric muscular contractions.
no movement is produced from contraction
why is no movement produced in isometric muscular contractions?
muscle generates tension but the length of the muscle doesn’t change during contraction so there is no movement
describe isotonic muscular contractions.
movement occurs from contraction
how is movement produced in isotonic muscular contractions?
during contraction, the muscle shortens in length, giving movement
what are the two ways in which isotonic contraction can occur?
concentric contraction and eccentric contraction
describe concentric contraction.
muscle shortens while producing movement, therefore causing joint movement
describe eccentric contraction.
muscle lengthens while producing tension and therefore controls joint movement
what type of isotonic contraction is needed when you are working against gravity?
eccentric