title: Single-leg lateral, horizontal, and vertical jump assessment: reliability, interrelationships, and ability to predict sprint and change-of-direction performance.
abstract: The purposes of this study were to determine the reliability of unilateral vertical, horizontal, and lateral countermovement jump assessments, the interrelationship between these tests, and their usefulness as predictors of sprint (10 m) and change-of-direction (COD) performance for 80 men and women physical education students. Jump performance was assessed on a contact mat and sprint, and COD performances were assessed using timing lights. With regard to the reliability statistics, the largest coefficient of variation (CV) was observed for the vertical jump (CV = 6.7-7.2%) of both genders, whereas the sprint and COD assessments had smallest variability (CV = 0.8 to 2.8%). All intraclass correlation coefficients (ICC) were greater than 0.85, except for the men's COD assessment with the alternate leg. The shared variance between the single-leg vertical, horizontal, and lateral jumps for men and women was less than 50%, indicating that the jumps are relatively independent of one another and represent different leg strength/power qualities. The ability of the jumps to predict sprint and COD performance was limited (R2 < 43%). It would seem that the ability to change direction with 1 leg is relatively independent of a COD with the other leg, especially in the women (R < 30%) of this study. However, if 1 jump assessment were selected to predict sprint and COD performance in a test battery, the single-leg horizontal countermovement jump would seem the logical choice, given the results of this study. Many of the findings in this study have interesting diagnostic and training implications for the strength and conditioning coach.
authors.affiliation: School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Joondalup, Australia. c.meylan@ecu.edu.au
authors.forename: Cesar
authors.initials: C
authors.lastname: Meylan
authors.forename: Travis
authors.initials: T
authors.lastname: McMaster
authors.forename: John
authors.initials: J
authors.lastname: Cronin
authors.forename: Nur Ikhwan
authors.initials: NI
authors.lastname: Mohammad
authors.forename: Cailyn
authors.initials: C
authors.lastname: Rogers
authors.forename: Melissa
authors.initials: M
authors.lastname: Deklerk
mesh_terms: D000886:Anthropometry; D054874:Athletic Performance; D005260:Female; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D011237:Predictive Value of Tests; D012044:Regression Analysis; D012420:Running / Q000502:physiology*; D055815:Young Adult