title: Relationship of the functional movement screen in-line lunge to power, speed, and balance measures.
abstract: BACKGROUND
  The in-line lunge of the Functional Movement Screen (FMS) evaluates lateral stability, balance, and movement asymmetries. Athletes who score poorly on the in-line lunge should avoid activities requiring power or speed until scores are improved, yet relationships between the in-line lunge scores and other measures of balance, power, and speed are unknown.
  
  
  OBJECTIVE
  (1) Lunge scores will correlate with center of pressure (COP), maximum jump height (MJH), and 36.6-meter sprint time and (2) there will be no differences between limbs on lunge scores, MJH, or COP.
  
  
  METHODS
  Descriptive laboratory study.
  
  
  METHODS
  Level 3.
  
  
  METHODS
  Thirty-seven healthy, active participants completed the first 3 tasks of the FMS (eg, deep squat, hurdle step, in-line lunge), unilateral drop jumps, and 36.6-meter sprints. A 3-dimensional motion analysis system captured MJH. Force platforms measured COP excursion. A laser timing system measured 36.6-m sprint time. Statistical analyses were used to determine whether a relationship existed between lunge scores and COP, MJH, and 36.6-m speed (Spearman rho tests) and whether differences existed between limbs in lunge scores (Wilcoxon signed-rank test), MJH, and COP (paired t tests).
  
  
  RESULTS
  Lunge scores were not significantly correlated with COP, MJH, or 36.6-m sprint time. Lunge scores, COP excursion, and MJH were not statistically different between limbs.
  
  
  CONCLUSIONS
  Performance on the FMS in-line lunge was not related to balance, power, or speed. Healthy participants were symmetrical in lunging measures and MJH.
  
  
  CONCLUSIONS
  Scores on the FMS in-line lunge should not be attributed to power, speed, or balance performance without further examination. However, assessing limb symmetry appears to be clinically relevant.
authors.affiliation: Department of Physical Therapy, University of New England, Portland, Maine.
authors.forename: Erin H
authors.initials: EH
authors.lastname: Hartigan
authors.affiliation: Department of Physical Therapy, University of New England, Portland, Maine.
authors.forename: Michael
authors.initials: M
authors.lastname: Lawrence
authors.affiliation: Department of Physical Therapy, University of New England, Portland, Maine ; Coastal Orthopedics and Sports Medicine, Brunswick, Maine.
authors.forename: Brian M
authors.initials: BM
authors.lastname: Bisson
authors.affiliation: Department of Physical Therapy, University of New England, Portland, Maine ; MTI Physical Therapy, Bellevue, Washington.
authors.forename: Erik
authors.initials: E
authors.lastname: Torgerson
authors.affiliation: Department of Physical Therapy, University of New England, Portland, Maine ; Excel Physical Therapy, Pinnacle Rehabilitation Network Affiliate, Raymond, New Hampshire.
authors.forename: Ryan C
authors.initials: RC
authors.lastname: Knight
keywords: limb dominance; screening; symmetry; unilateral