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Dynamic Knee Extension Test

Testing and measurement are the means of collecting information upon which subsequent performance evaluations and decisions are made but, in the analysis, we need to bear in mind the factors that may influence the results.


The objective of this test is to assess the strength of the athlete's knee extensor muscles

Required Resources

To undertake this test, you will require:

  • Universal knee flexor/extensor bench
  • Assistant

How to conduct the test

  • The athlete warms up for 10 minutes
  • The assistant sets the resistance close to the athlete's one repetition maximum load
  • The athlete sits on the end of the bench with the padded edge of the bench against the posterior surface of the knee joint, the feet hooked behind the padded rollers and the hands grasping the bench just behind their buttocks
  • The athlete conducts knee extensions until they are unable to continue
  • The assistant counts the number of successful knee extensions
  • If the number of knee extensions exceeds 12 then the athlete rests for 10 minutes, the assistant increases the resistance and the athlete repeats the test
  • Assistant records the final resistance and 1RM using the Brzycki [1] (1993) equation
    • 1RM = Weight ÷ (1.0278 - (0.0278 × Number of repetitions))


Analysis of the result is by comparing it with the results of previous tests. It is expected that, with appropriate training between each test, the analysis would indicate an improvement.

Target Group

This test is suitable for active athletes but not for individuals where the test would be contraindicated.


Test reliability refers to the degree to which a test is consistent and stable in measuring what it is intended to measure. Reliability will depend upon how strict the test is conducted and the individual's level of motivation to perform the test. The following link provides a variety of factors that may influence the results and therefore the test reliability.


Test validity refers to the degree to which the test actually measures what it claims to measure and the extent to which inferences, conclusions, and decisions made on the basis of test scores are appropriate and meaningful. This test provides a means to monitor the effect of training on the athlete's physical development.


  • Minimal equipment required
  • Simple to set up and conduct
  • The test can be administered by the athlete


  • Specialist equipment required
  • Assistant required to administer the test


  1. BRZYCKI, M. (1993) Strength testing-Predicting a one-rep max from reps-to-fatigue. JOPERD, 68, p. 88-90.

Related References

The following references provide additional information on this topic:

  • Fitzgerald, G. K. et al. (2001) Hop tests as predictors of dynamic knee stability. Journal of Orthopaedic & Sports Physical Therapy31 (10), p. 588-597

Page Reference

If you quote information from this page in your work, then the reference for this page is:

  • MACKENZIE, B. (2005) Dynamic Knee Extension Test [WWW] Available from: [Accessed

Related Pages

The following Sports Coach pages provide additional information on this topic: