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Lec050.%20Muscular%20Strength_Blank - 1 MUSCULAR STRENGTH...

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MUSCULAR STRENGTH Muscular strength - the greatest amount of _________ that muscles can produce in a single maximal _________. Power - ___________ per unit _______ - force X velocity. Power involves strength and speed. BENEFITS OF STRENGTH TRAINING STRENGTH PROVIDES A FOUNDATION FOR OTHER COMPONENTS OF PHYSICAL FITNESS SUCH AS __________ ___________ CAPACITY AND MUSCULAR _____________ SLOW DOWN THE MUSCLE ________ THAT NORMALLY ACCOMPANIES THE AGING PROCESS --> INCREASE FUNCTIONAL MOBILITY SO THAT DAILY ACTIVITIES ARE MADE BOTH POSSIBLE AND EASIER INCREASE THE ________ AND __________ OF MUSCLE FIBERS RESULTING IN A GREATER PHYSICAL CAPACITY TO PERFORM WORK INCREASED TENDON, LIGAMENT AND BONE TENSILE ______________ STRONGER MUSCLES BETTER ___________ THE JOINTS THAT THEY CROSS IMPROVED PHYSICAL ____________________ BETTER TONE OF THE MUSCLES OF THE TRUNK HELPS TO PREVENT COMMON _____________ PROBLEMS STRONGER MUSCLES ARE LESS LIKELY TO BE ____________ AND ___________ IMPROVEMENTS IN SELF-CONCEPT AND SELF- ESTEEM FOR BOTH ATHLETIC AND PATIENT POPULATIONS A. Types of Muscular Contraction 1. Dynamic (isotonic) contraction - the bony levers move through a range of __________ when the appropriate muscles perform __________. Concentric contraction - the muscle ___________ with varying tension as it lifts a constant load. Eccentric contraction - the external resistance exceeds the muscle force and the muscle ____________ while developing force. Eccentric contractions are usually used in resisting __________. 2. Isometric contraction - _________ contraction. Tension is developed but there is no change in the _________ of the joint or the ________ of the muscle. 3. Isokinetic contraction - the muscle is shortened at a constant __________ determined by instrumentation which allows a person to exert maximal ________ throughout the ______ range of motion. B. Strength Testing Techniques 1. One Repetition Maximum - maximum amount of ________ 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 _________ of some type which is deformed a certain amount when a specific force is applied to it. (eg) - hand grip dynamometer - measures __________ strength - relatively inexpensive, high reliability if body position is carefully standardized for each trial of the test 3. Computer-Assisted, Isokinetic Methods - equipment such as Cybex, Biodex, KIN/COM, etc. - isokinetic machine, but many of these machines can also test strength in isometric, concentric, and eccentric modes - has a microcomputer which can be programmed at any initial and final force, angle, velocity, or number of repetitions. - measure peak torque using a force transducer and joint angle using an electrogoniometer. - extensive manipulations can be performed on collected data using computer software - accurate and reliable, but expensive C. Strength Testing Considerations In addition to validity, reliability, etc., 1. ____________ instructions should be given prior to testing.
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