There are two forms of scleroderma: localized scleroderma (primarily affects the skin, most common form found in children) and systemic sclerosis (a chronic, degenerative disease rarely seen in children). Linear scleroderma is a progressive loss of subcutaneous fat with pigment changes in the skin.
We assume that the person described here starts the work period eagerly, using stored glycogen at the beginning of the work session. Muscle glycogen remains is the major source of energy during the first half-hour. After this period we see that fatty acids and blood glucose takes over as important energy sources.
They are specially equipped for explosive function for very short periods. The energy supply for those who run from about 60 seconds to three minutes is also stored energy, but in this case it is primarily glycogen stored in muscles (and blood glucose) that provides energy. Glycogen must be oxidized to pyruvate, lactate and CO2 to provide the ATP required for muscle activity.