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Interpretation of Isokinetic Tests

Interpretation of Isokinetic Tests. Concepts. Introduction Principle of isokinetics Benefits of training through isokinetic exercise Basic terminology Reading test results Curve analysis. Introduction. Subjective/objective Criteria-based protocols Goals with reproducible data

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Interpretation of Isokinetic Tests

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  1. Interpretation of Isokinetic Tests

  2. Concepts • Introduction • Principle of isokinetics • Benefits of training through isokinetic exercise • Basic terminology • Reading test results • Curve analysis

  3. Introduction • Subjective/objective • Criteria-based protocols • Goals with reproducible data • Biodex advantage!

  4. Principles of isokinetics • Preset fixed speed • Accommodating resistance • Resistance = effort • Torque measured throughout ROM • Muscle loaded throughout ROM • 30 degree overflow • Strength • physiological

  5. Functional Test Speeds • Walking – 233°/s • Running – 1000°/s – 1200° • Ankle during running – 540°/s • Train & test at fast speeds

  6. Benefits of training • Time rate of tension development (TRTD) • Upslope of the curve • Decreased reciprocal innervation time (RIT) • Time between end of agonist and beginning of antagonist • Strengthen musculotendinous junction • Reduces risk of strains

  7. Basic Terminology/Interpretation • Peak torque: • Absolute strength value (1 RM) • Work: • Functional value of muscle performance • Torque over distance • Power: • How effective the muscle can perform work over time

  8. Reading test results • Is the test reliable and valid? • Coefficient of variance • Large values? • Acceptable CV’s (large/small muscle groups)

  9. Reading test results • Percent deficit • Acceptable vs unacceptable • Negative value? • Considerations for unilateral athletes?

  10. Reading test results • Peak torque • Difficult to assess if used alone • Peak torque/body weight • % of torque produced to body weight • Normative goals - see chart

  11. Reading test results • Max rep total work • Better indicator of neuromuscular function • Muscle must remain recruited during entire range • Should occur within first few reps of test • Work first 1/3..work last 1/3 • Should be more work in first 1/3 • Look for consistency • Effort

  12. Reading test results • Work fatigue • Ratio between first 1/3 and last 1/3 • Should decrease with progress • Acceleration time • Time to reach isokinetic speed • Deceleration time • From isokinetic speed to zero • Eccentric control towards end of ROM

  13. Curve analysis • 4 regions of the curve • Time rate of torque development (TRTD)

  14. Curve analysis • Force Decay Rate ROM Involved side T FDR FDR ROM Uninvolved side

  15. Curve analysis • Reciprocal innervation time (V vs U)

  16. Injury/condition curves

  17. Chondromalacia patella Q Q H H

  18. Plica syndrome

  19. Patellar subluxation

  20. ACL Deficiency

  21. Summary Reports • Absolute/relative • Bilateral comparisons • Unilateral comparisons

  22. T:BW Ratio • General joint integrity

  23. Summary • Correlate to clinical exam • Use pre-established criteria • Valid/reproducible or throw out • Documents muscular performance only

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