Wellness bio questions???????

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  1. Define and describe isometric, isotonic, and isokinetic muscle training systems.

2. Discuss the strengths and weaknesses of each of these systems.

Jun 25th, 2015

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Isometric Exercise

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

Isotonic Exercise

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

Isotonic Positives

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

Isotonic Negatives

Only can use oad the weakest point can lift; Requires training on proper completion for safety

Isokinetic Exercise

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

Isokinetic Positives

Maximum resistance through full ROM: can change at weaker points in ROM; High speed (500 degrees/sec); Provides good objective data (work comp)

Isokinetic Negatives

Expensive equipment; No interia; Requires training of staff

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Jun 25th, 2015

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