Traditionally, lower extremity strength assessment has been performed in an open kinetic chain. Several authors, however, recommend closed kinetic chain assessment of lower extremity performance. Reliability of closed kinetic chain tests is not available. Therefore, the purpose of this study was to determine the reliability of the following single-leg hop tests: hop for distance, 6-m hop for time, and 30-m agility hop. Eighteen subjects (4 males and 14 females) participated in this study. An ANOVA repeated measures analysis revealed significant differences between the test trials within and between sessions for all dependent variables. However, when the mean of two test trials was analyzed, the three single-leg hop tests values were stable, that is, intraclass correlation coefficient (ICC 2,1) ranged from 0.77 to 0.99. Results demonstrate that these three single-leg hop tests were reliable as used in this study. Future research is needed to determine the sensitivity of these tests in the assessment of lower extremity performance following injury and following rehabilitation procedures.
Laurie D. Booher and Karla M. Hench were students at the Krannert Graduate School of Physical Therapy at the time of this study and now are with St. Francis Sports Medicine Center, Indianapolis, IN. Teddy W. Worrell and Jill Stikeleather are with the Krannert Graduate School of Physical Therapy, University of Indianapolis, Indianapolis, IN 46227-3697. Direct correspondence to Teddy W. Worrell.