title: Correlation of single leg vertical jump, single leg hop for distance, and single leg hop for time.
abstract: OBJECTIVE
  To determine the correlation among three functional tests: single leg vertical jump (SLVJ), single leg hop for distance (SLHD), and single leg hop for time (SLHT).
  
  
  METHODS
  Prospective correlational investigation.
  
  
  METHODS
  University research laboratory.
  
  
  METHODS
  Forty healthy men (n = 19) and women (n = 21) between the ages of 18 and 30 (23.9 ± 2.0 years).
  
  
  METHODS
  SLVJ was measured using the Vertec. SLHD was measured using a standard tape measure. SLHT was measured over a 10-m course using a standard stopwatch.
  
  
  RESULTS
  The strongest correlation was between SLHT and SLHD, -0.89 and -0.89 for dominant and non-dominant lower extremities (LE), respectively. The weakest pairwise correlation was between SLVJ and SLHT, -0.71 and -0.63 for dominant and non-dominant LE, respectively. The correlation between SLVJ and SLHD was 0.74 and 0.71 for dominant and non-dominant LE, respectively.
  
  
  CONCLUSIONS
  There is a strong correlation between SLHT and SLHD, suggesting that each test measures similar constructs of function, while the modest correlation between SLVJ and SLHT suggest these two tests do not measure the same functional components, and could be paired as outcome measures for the clinical assessment of lower extremity function.
authors.affiliation: Division of Physical Therapy, West Virginia University, 8312 HSS, PO Box 9226, Morgantown, WV 26506, USA.
authors.forename: Joey
authors.initials: J
authors.lastname: Swearingen
authors.forename: Eric
authors.initials: E
authors.lastname: Lawrence
authors.forename: Jacob
authors.initials: J
authors.lastname: Stevens
authors.forename: Casey
authors.initials: C
authors.lastname: Jackson
authors.forename: Carol
authors.initials: C
authors.lastname: Waggy
authors.forename: D Scott
authors.initials: DS
authors.lastname: Davis
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D007866:Leg / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D011446:Prospective Studies; D013223:Statistics as Topic; D013997:Time Factors; D055815:Young Adult