Kinesiology 4433A/B Lecture Notes - Lecture 7: Skeletal Muscle, Myocyte, Strength Training

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Movement, exercise, and sport requires generation of force by skeletal muscle fibres. Force can be generated while skeletal muscle remains static, become shorter (concentric), or increase in length (eccentric). Isometric = muscle develops tension, no change in joint angle. Isotonic = muscular force is developed in lifting a constant resistance through rom. Isokinetic = contraction through rom at constant speed. Strength, speed and muscle/joint coordination all contribute to peak power. Slow-twitch fibers are: fatigue resistant, do(cid:374)(cid:859)t (cid:272)o(cid:374)tra(cid:272)t as rapidl(cid:455) a(cid:374)d for(cid:272)efull(cid:455) as fast-twitch fibers, rely primarily on the aerobic energy system. Rely more on the anaerobic energy system. Overload = increased muscular strength occurs only when the muscles are forced to contract against a greater load or resistance than is normally encountered. Progressive resistance = with gains in strength, the resistance must be continually increased to provide greater than normal load. Muscle strength, endurance leads to improved sport performance and improve function. Muscle support joints helps with injury prevention.

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