Isokinetics Flashcards
Biodex
- Provides a resistance force due to what force is provided
- Test for a single joint
- Ex: knee extension and flexion
- Strength assessment and evaluation
What is important about the velocity during biodex?
It stays constant!
How do the internal moment arms change?
Where someone is in the ROM changes the length tension relationship and actin/myosin crossover
What are stronger? Quads or Hamstrings?
Quads
Are there many movement skills that are isokinetic?
No
What are some reasons based on muscle mechanics that may cause isokinetic torque to be different throughout the range of motion of the joint being tested?
Length of muscle
Internal moment arms of where the muscle attaches to the bony segment
Effect of resistance
Correction for gravity or not
How would isometric torque compare with isokinetic torque output? What about eccentric?
Isometric is greater than concentric due to force velocity curve. Faster velocity leads to decreased torque. Due to actinmyosin cross bridges needing time to form.
How does isokinetic movement velocity influence peak torque output?
The faster you move the lower the force output
Internal Moment Arm Points
Perpendicular line from vector to Axis of rotation
Isokinetic
Constant movement
Faster Eccentric = ?
Higher torque
Faster Concentric = ?
Lower torque
