title: Relationship between hip and core strength and frontal plane alignment during a single leg squat.
abstract: OBJECTIVE
  The purpose of this study was to examine the relationship between frontal plane kinematics of the single leg squat and strength of the trunk and hip in females.
  
  
  METHODS
  Forty healthy females participated in this study.
  
  
  METHODS
  An isometric "make" test using a dynamometer was used to assess peak force normalized to body weight for hip abduction, hip extension, hip external rotation, and a sidelying plank test. Two-dimensional software was used to analyze the frontal plane projection angle (FPPA) and pelvic angle during a single leg squat to 60°.
  
  
  RESULTS
  All 4 strength factors were significantly correlated with the FPPA, ranging from r = 0.396 to r = 0.466. During multiple regression analysis, hip abduction strength was the greatest predictor of the variation in FPPA at r(2) = 0.22, p = 0.002. Thus, hip abduction strength accounted for 22% of the variation in the FPPA during the single leg squat. The only strength factor demonstrating a significant correlation with the pelvic angle was hip extension strength (r = 0.550, p < 0.001).
  
  
  CONCLUSIONS
  Clinicians should consider the role of the hip abductors, hip external rotators, hip extensors and core musculature on the impact on the FPPA during a single squat, with focus on the hip abductors.
authors: Grand Valley State University, Cook-Devos Center for Health Sciences, 301 Michigan St., NE Suite 247, Grand Rapids, MI 49503, USA. Electronic address: sticklel@gvsu.edu.
authors: Laurie
authors: L
authors: Stickler
authors: Krannert School of Physical Therapy, University of Indianapolis, 1400 E. Hanna Ave, Indianapolis, IN 46227, USA. Electronic address: finleym@uindy.edu.
authors: Margaret
authors: M
authors: Finley
authors: Grand Valley State University, 1 Campus Drive, MAK B2-222, Allendale, MI 49401, USA. Electronic address: gulginh@gvsu.edu.
authors: Heather
authors: H
authors: Gulgin
mesh_terms: D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D005080:Exercise Test; D005260:Female; D006615:Hip / Q000033:anatomy & histology / Q000502:physiology*; D006801:Humans; D007866:Leg / Q000502:physiology*; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000502:physiology*; D046788:Patellofemoral Pain Syndrome; D011187:Posture / Q000502:physiology; D055815:Young Adult
keywords: Mechanics; Patellofemoral pain syndrome; Single leg squat