Final answer:
Isometric contractions produce tension without causing movement, meaning the initial statement is false. Movement is produced in isotonic contractions where muscle length changes and sarcomeres do shorten.
Step-by-step explanation:
The statement is false. Isometric contractions do not produce movement through the sliding of filaments; instead they generate tension while the muscle length remains constant.
During isometric contractions, although the sarcomeres within the muscle fibers activate and attempt to shorten by pulling the actin and myosin filaments past one another, the movement does not occur because the generated muscle tension is not sufficient to move the load.
As a result, while there is increased muscle tension, there is no shortening of the muscle overall, which means no movement is produced. On the contrary, movement is associated with isotonic contractions, where the muscle length changes to move a load, as sarcomeres shorten and the muscle fibers contract.