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Isokinetic Strength and Power Testing

Isokinetic Strength and Power Testing. Dynamometers. Definitions. Isometric – same length Isotonic – same resistance Isokinetic – same speed. Desired Information. What is the purpose of the test? Who is being tested? Speed, strength, power, endurance?. Desired Information. Peak Torque

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Isokinetic Strength and Power Testing

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  1. Isokinetic Strength and Power Testing

  2. Dynamometers

  3. Definitions • Isometric – same length • Isotonic – same resistance • Isokinetic – same speed

  4. Desired Information • What is the purpose of the test? • Who is being tested? • Speed, strength, power, endurance?

  5. Desired Information

  6. Peak Torque Total Work Average Power Agonist/Antagonist Ratio Bilateral Ratio Analysis

  7. Max Torque Force Min 240 0 750 d/s Torque/Velocity Curve

  8. Torque/Velocity Curve

  9. Total Work • Torque x Distance • Area under the curve • Includes force, lever arm and distance traveled

  10. Max Torque Work Min 240 0 750 d/s Work/Velocity Curve

  11. Average Power • Work/time • Includes all other variables • May be most closely related to activities of daily living • Measure of explosiveness

  12. Power Max Torque Min 0 240 750 d/s Power/Velocity Curve

  13. Power/Velocity Curve

  14. Velocity • The key to life! • Force is ONLY a byproduct of velocity. • Acceleration is the KEY to velocity. • Max velocity results in max energy. • Goal is to maximize the RATE of force development.

  15. Load RangeAcceleration and Deceleration

  16. Load Range/Velocity

  17. Bilateral

  18. Confounding Elements • Spikes • Oscillations • Overshoot • Impact

  19. Non-Windowed

  20. Windowed

  21. Agonist/Antagonist Ratio • Unilateral ratio of muscle groups • Quadriceps to hamstring value • 60% at 60 d/s • Internal to external shoulder rotators • Dorsi to plantar ankle value

  22. Bilateral Ratio • Ratio of left to right • 10-15% at 60 d/s • Ratio increases with velocity • May identify imbalances

  23. Practical Application • Biodex System 3 • $45,000.00 • Research, rehab and evaluation.

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