Final answer:
Muscles are able to produce larger forces during eccentric contractions than during concentric contractions.
Step-by-step explanation:
In isotonic contractions, where the tension in the muscle stays constant, there are two types of contractions: concentric and eccentric.
A concentric contraction involves the muscle shortening to move a load, while an eccentric contraction occurs as the muscle tension diminishes and the muscle lengthens. Muscles are able to produce larger forces during eccentric contractions than during concentric contractions.