Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2007) 06, 261 - 264

Research article, Young investigator
Reliability of Kinematics and Kinetics Associated with Horizontal Single Leg Drop Jump Assessment. a Brief Report.
Markus Stålbom1, , David Jonsson Holm1, John Cronin1,2, Justin Keogh1
Author Information
1 Institute of Sport and Recreation Research New Zealand, Auckland University of Technology, Auckland, New Zealand
2 School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Western Australia, Australia

Markus Stålbom
✉ Björnkällevägen 21, 183 60 Täby, Sweden.
Email: markus.stalbom@bgmsanalys.se
Publish Date
Received: 13-12-2006
Accepted: 21-02-2007
Published (online): 01-06-2007
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ABSTRACT

Determining the reliability of a unilateral horizontal drop jump for displacement provided the focus for this research. Eighteen male subjects were required to step off a 20cm box and land on a force plate with one leg and thereafter jump for maximal horizontal displacement on two different days. Dependent variables from the jump assessment included mean and peak vertical (V) and horizontal (H) ground reaction forces (GRF) and impulses, horizontal displacement and contact time. The between-trial variability of all kinematic and kinetic measures was less than 7%. The most consistent measure over both trials was the horizontal displacement jumped (1.2 to 1.4%) and the most variable were the contact time the first day (6.5%) and peak HGRF the second day (4.3%). In all cases there was less variation associated with the second rather than the first day. In terms of test-retest variability the percent changes in the means and coefficient of variations (CVs) were all under 10%. The smallest changes in the mean (0.43 %), least variation (< 2.26 %) and second highest intraclass correlation co-efficient (ICC = 0.95) were found for horizontal displacement jumped. The highest ICC (0.96) was found for horizontal impulse. Given the reliability of the single leg drop jump, it may offer better prognostic and diagnostic information than that obtained with bilateral vertical jumps.

Key words: Ground reaction force, impulse, assessment


           Key Points
  • There is a need for greater understanding and utilisation of assessment techniques that assess both the horizontal and vertical components of force/power production.
  • The single leg drop jump is an assessment that exhibits high face validity (a unilateral jump involving both vertical and horizontal propulsive forces that also involves pre-load) but reliability needed to be quantified.
  • The reliability of the many kinematic and kinetic variables quantified in this study were similar to those published in research in this area and future research needs to determine the clinical and practical significance of this test.
 
 
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