In an isotonic contraction, only 25 percent of the energy consumed is realized as external work, and the remaining 75 percent is converted to heat.

Question

Quizplus · Accepted Answer

This statement is true. In isotonic contractions, the muscle shortens against a constant load, and only a portion of the energy consumed is converted to external work. The majority of the energy is converted to heat, which is why muscles can sometimes feel warm or hot after exercise.

In an Isotonic Contraction, Only 25 Percent of the Energy