Some metabolic consequences of adaptation to muscular work

In individuals adapted to systematic and intense muscular exercise there is often a rapid increase in body-weight if output of energy is suddenly decreased by cessation of muscular work. This phenomenon is observed, for instance, in sportsmen who stop physical training. It may, however, also occur in the normal population when energy output is decreased for any reason, e.g. convalescence or change of employment, and sometimes this phenomenon may lead to obesity.