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Same length; Muscle contraction without noticeable change in length of muscle (velocity = 0); No physical work done, but tension and force output production are high; Contraction must be held for at least 6 seconds to develop peak tension
Isometric Exercise Positives
Can use initially in rehab secondary to ROM; Maintain neural connections
Isometric Exercise Negatives
Doesn't strengthen full ROM (10 degress carryover); No functional benefits
Same tension; Exercise carried out against a load (constant or vaiable) while the muscle shortens or elongates through the available range (velocity = variable); Used to increase dynamic strength, muscle endurance and power; May be performed with manual or mechanical resistance
Multiple points get load; Can be open or closed chain; Easy application; Can be inexpensive; Contraction against a maximal load produces more tension than an isometric contraction
Only can use oad the weakest point can lift; Requires training on proper completion for safety
Same movement speed; Movement occurring at a constant, controlled speed (velocity=constant); Resistance will vary throughout the RAM, as exercise load changes in relation to the ability of the muscle to produce force in various parts of the ROM; Allow concentric and eccentric exercise; Strength gains appear to be speed dependent: training speed=speed where the strength gains occur; Can safely perform movements at high rate that would cause damage in isontonic exercises
Maximum resistance through full ROM: can change at weaker points in ROM; High speed (500 degrees/sec); Provides good objective data (work comp)
Expensive equipment; No interia; Requires training of staff
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