title: Assessment of power, speed, and agility in athletic, preadolescent youth.
abstract: OBJECTIVE
  The aim of this report was to assess power, speed, and agility in athletic, preadolescent youth, and determine how agility related to muscular strength and power.
  
  
  METHODS
  Boys (N.=53) and girls (N.=104) completed vertical jump (VJ), standing long jump (SLJ), seated medicine ball throw (SMBT), proagility shuttle run (PRO), partial curl-ups (CURL), and 20 yd sprint (20 SP). One-way analysis of variance for gender comparison and multiple regression analysis for determining association among tests were used.
  
  
  RESULTS
  No gender differences (P>0.05) existed for VJ or PRO. However, boys performed better on SLJ (P=0.03; 162.61+24.64 vs.154.51+20.78 cm), 20 SP (P=0.001; 3.70+0.35 vs. 3.96+0.33 s), and CURL (P=0.02; 35.16+9.67 vs. 31.48+8.80) while girls scored higher on SMBT (P=0.001; 340.46+68.58 vs. 287.12+56.39 cm). Among girls, PRO was correlated (P<0.01) with SLJ (r=-0.70) and VJ (r=-0.67). In boys, correlations (P<0.01) existed between VJ and SLJ (r=0.73) and 20 SP and PRO (r=0.72).
  
  
  CONCLUSIONS
  The current study supports previous research that found a correlation between SLJ and VJ. SLJ, VJ and SP were significant predictors of PRO, accounting for 55%, 46%, and 43% of the variation, respectively. The PRO agility test is easy to administer and requires lower body strength and power necessary for the quick changes in direction inherent to ground-based field sports. When designing a performance-related test battery for young athletes, PRO, SLJ, and VJ are effective measures and worthy of inclusion.
authors.affiliation: Sports Medicine Assessment, Research and Testing (SMART) Laboratory,Division of Health and Human Performance George Mason University, Fairfax, VA, USA - mjones15@gmu.edu.
authors.forename: M T
authors.initials: MT
authors.lastname: Jones
authors.forename: D C
authors.initials: DC
authors.lastname: Lorenzo
mesh_terms: D054874:Athletic Performance / Q000502:physiology*; D002648:Child; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D010809:Physical Fitness / Q000502:physiology*; D012737:Sex Factors