A form of rundown that develops in those training beyond the adaptation capacity of the body. Over-strain occurs commonly in those taking part in sports which require excessive energy outputs, such as long-distance running and cross-country skiing. Unlike over-training, it includes physiological fatigue which causes both nervous and hormonal disturbances. These are indicated by a decrease in activity of the sympathetic nervous system with a reduction in adrenal function, and greater activity of the parasympathetic nervous system.
Subjects: Sports and Exercise Medicine.