Exemplar Problems

Question 3

What are the differences between isotonic and isometric muscle contractions?

Solution: Isotonic and isometric contractions are two types of muscle movements. In isotonic contractions, the muscle changes length during the contraction, leading to movement. Isotonic contractions can be further classified as concentric, where the muscle shortens (e.g., lifting a weight), or eccentric, where the muscle lengthens while under tension (e.g., lowering a weight). On the other hand, in isometric contractions, the muscle does not change length; instead, muscle tension increases without causing movement. An example of an isometric contraction is holding a heavy object in a steady position.