Wave summation is an increase in muscle contraction strength based on how rapidly a muscle is stimulated. Wave summation occurs because muscles that are rapidly stimulated are not able to relax between repeated stimulati... More »

Motor unit summation is the build-up of the myoelectrical signals of the active motor unit during continuous, sustained muscle contraction. Sustained contraction causes the motor unit to fire continuously, creating myoel... More »

Motor unit summation is the build-up of the myoelectrical signals of the active motor unit during continuous, sustained muscle contraction. Sustained contraction causes the motor unit to fire continuously, creating myoel... More »

A skeletal muscle twitch is shorter than a tetanic contraction, according to Dr. Paul Deeble of Mary Baldwin College. A twitch contraction is a short, jerky movement in response to a single stimulus in a muscle fiber. A ... More »

Muscle fascicles bundle muscle fibers together for extra strength, allowing the muscle to exert more force. The diameter and length of muscle fascicles vary depending on the specific function of the muscle. More »

According to MedlinePlus, deltoid muscle atrophy is a condition in which the deltoid muscles of the shoulder have become wasted or diminished, resulting in loss of strength or movement. Causes of deltoid muscle atrophy i... More »

Exercises that increase flexibility and strength, such as the standing calf stretch and the double-leg calf raise, help resolve calf pain, which is often caused by tightness and weakness in lower leg muscles and injuries... More »

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