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Muscular Strength01

Muscular Strength01 - MUSCULAR STRENGTH Muscular strength...

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Unformatted text preview: MUSCULAR STRENGTH Muscular strength - the greatest amount of force that muscles can produce in a single maximal effort. Power - work per unit time - force X velocity. Power involves strength and speed. A. Types of Muscular Contraction 1. Dynamic (isotonic) contraction - the bony levers move through a range of motion when the appropriate muscles perform work. Concentric contraction - the muscle shortens with varying tension as it lifts a constant load. Eccentric contraction - the external resistance exceeds the muscle force and the muscle lengthens while developing force. Eccentric contractions are usually used in resisting gravity. 2. Isometric contraction - static contraction. Tension is developed but there is no change in the angle of the joint or the length of the muscle. 3. Isokinetic contraction - the muscle is shortened at a constant velocity determined by instrumentation which allows a person to exert maximal force throughout the full range of motion. B. Strength Testing Technigues 1. One Repetition Maximum - maximum amount of weight lifted once. Use free weights or machines that allow dynamic muscle contractions - Universal Gym, etc. Nautilus Machines - accomodating resistance devices - leverage characteristics change as the joint goes through a range of motion so that the muscle is stressed more at more optimal joint angles. 2. Dynamometer Techniques - a strength testing dynamometer usually consists of a spring of some type which is deformed a certain amount when a specific force is applied to it. (eg) - hand grip dynamometer ...
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