ABSTRACT
The increase in total energy expenditure (TEE) during and after exercise is mostly attrib utable to an increased metabolism within working muscles themselves. For example, stim ulated quadriceps femoris muscle working at maximal exertion may increase its metabolism 300-fold. Furthermore, depending upon the intensity and duration of an exer cise, along with the mass of skeletal muscle involved, TEE may be augmented by several hundred kilocalories to power postexercise recovery and adaptation mechanisms. While most of the increased energy expended during exercise is attributed to exercising muscle, metabolism within various supporting organs (i.e., heart, lungs) must also increase to sup port exercise as well.
