As you go to lift your backpack off of the floor, there is a period of time when the muscles of your arm and back are contracting but your backpack has yet to move. The muscles are developing tension before they begin to shorten and before the bag begins to be lifted. This type of contraction is called an __________ contraction.
A) isotonic
B) isometric

Question

Quizplus · Accepted Answer

Isometric contractions occur when muscle tension is generated without any visible movement in the angle of the joint. This is the case when the muscles are exerting force against a load which has yet to move, such as trying to lift a heavy backpack off the ground before it actually starts to move.

As You Go to Lift Your Backpack Off of the Floor