PHYS ED 32 Lecture Notes - Lecture 4: Heredity, Bench Press, Motor Unit
24 Oct 2013
School
Department
Course
Professor
Document Summary
Muscular strength: usually assessed by measuring the maximum amount of weight a person can lift one time. e. g. taking 1 rm for the bench press. Muscle fascicle (bundle of fibers) muscle fiber (all) myofibril. Sarcomere basic unit of muscle; composed of long, fibrous proteins that slide past each other when the muscles contract and relax: protein filaments, sliding filaments, theory: filaments slide and contract when energy is used. Myosin and actin: muscle proteins responsible for elastic and contractile properties of muscle. Hypertrophy: larger size of individual muscle fiber (via lifting, working out) Slow twitch (endurance athletes) vs. fast twitch (sprinters) Slow twitch: resist fatigue, don"t contract as rapidly and forcefully as fast twitch fibers, rely primarily on the aerobic energy system. Fast twitch: fatigue more quickly than slow-twitch fibers, contract rapidly and forcefully, rely more on the anaerobic energy system. A motor unit is made up of a nerve connected to a number of muscle fibers.
