The Relationship between Lower Extremity Isokinetic Work and Single-Leg Functional Hop-Work Test

in Journal of Sport Rehabilitation
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Lower extremity functional testing assesses strength, power, and neuro-muscular control. There are only moderate correlations between distance hopped and isokinetic strength measures.


Determine if incorporating body weight in the single-leg hop for distance increases the correlation to isokinetic measures.

Study Design:

Correlational study.


Musculoskeletal laboratory.


30 healthy college students; 15 men and 15 women; ages 18 to 30 years.

Main Outcome Measures:

Isokinetic average peak torque and total work of quadriceps and hamstrings and single-leg hop work and distance.


Significant correlations include hop work to total-work knee extension (r = .89), average peak-torque knee extension (r = .88), distance hopped to total-work knee extension (r = .56) and average peak-torque knee extension (r = .63). Correlations involving hop work were greater than distance hopped (P < .05).


Use of body weight in the assessment of distance hopped provides better information about the patient’s lower extremity strength and ability than the distance hopped alone.

The authors are with the Dept of Rehabilitation Sciences, University of Kentucky, Lexington, KY 40536-0200.