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Figure A
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Figure B
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Figure C
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Figure D
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Figure E
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Figure B represents eccentric exercise and is the excercise that most efficiently strengthens skeletal muscle. Eccentric exercise is a type of isotonic exercise that includes constant muscle tension while the muscle is lengthening. Figure A represents a concentric exercise, also a type of isotonic exercise, as the muscle is shortening and the tension is proportional to the external load. Figure C represents isometric exercise since there is constant muscle length and tension that is proportional to the external load and no movement. A similar movement would include pushing against an immovable object such as a wall. Figure D displays isokinetic strengthening on a Cybex machine and involves movement at a constant speed (often controlled by a dynamometer). Figure E is an example of plyometrics and includes exercises using explosive movements to develop muscular power (such as bounding, hopping, and jumping).
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