NASM Full Glossary

NASM Full Glossary A-Band The region of the sarcomere where myosin fi laments are predominantly seen with minor overlap of the actin fi laments Abduction A movement in the frontal plane away from the midline of the body Acceleration When a muscle exerts more force than is being placed on it, the muscle will shorten. Also known as a concentric contraction or force production Acidosis The accumulation of excessive hydrogen that causes increased acidity of the blood and muscle Actin One of the two major myofi laments, actin is the "thin" fi lament that acts along with myosin to produce muscular contraction Action Potential Nerve impulse that allows neurons to transmit information Active Flexibility The ability of agonists and synergists to move a limb through the full range of motion while their functional antagonist is being stretched Active-Isolated S