- contractile component - actively develops tension and shortening, can lie in part in the tendinous filaments into which muscle fibers insert, its function to tension development in the whole muscle-tendon unit when the muscles shortens from a previously stretched position.
- parallel elastic component - comes into action only when the muscle is stretched, its mostly connective tissue and is responsible for the resting tension. The physical arrangement has practical consequences. During standing or at low-speed locomotion, the contractile component is responsible for the mechanical work and power output. But at higher speed, shortening contractions (positive work) are immediately preceded by a lengthening contraction (negative work) which the active muscles are stretched and mechanical energy is stored in the muscle's elastic and viscoelastic components.
Compartment syndrome develops when swelling or bleeding occurs within a compartment. Because the fascia "does not stretch," this can cause increased pressure on the capillaries, nerves, and muscles in the compartment. Blood flow to muscle and nerve cells is disrupted. Without a steady supply of oxygen and nutrients, nerve and muscle cells can be damaged.
In acute compartment syndrome, unless the pressure is relieved quickly, permanent disability and tissue death may result. This does not usually happen in chronic (exertional) compartment syndrome.
Compartment syndrome most often occurs in the anterior (front) compartment of the lower leg (calf). It can also occur in other compartments in the leg, as well as in the arms, hands, feet, and buttocks and between your legs while on a saddle.
Chronic (Exertional) Compartment Syndrome
The pain and swelling of chronic compartment syndrome is caused by exercise. Athletes who participate in activities with repetitive motions, such as running, biking, or swimming, are more likely to develop chronic compartment syndrome. This is usually relieved by discontinuing the exercise, and is usually not dangerous.
What to do if you over did it?