An exercise in which the action of a muscle group produces no movement of the joint to which the muscles are attached. Such exercises include pressing the hands together at the chest and pushing against an immovable object. Isometric exercises produce good strength gains, but only at the specific angle of muscle action. For best results, static action exercises should involve maximal or near maximal static actions against a resistance for at least 5 s. These exercises can be performed almost anywhere and require no specialized equipment. However, they have little beneficial effect on cardiovascular fitness. In fact, such exercises are contra-indicated for individuals with cardiovascular disease because the exercises can increase intra-abdominal pressure and blood pressure and put a strain on the heart.
Subjects: Sports and Exercise Medicine.