Single-Leg Squat Delicacies—The Position of the Nonstance Limb is an Important Consideration

Benita Olivier (Lead / Corresponding author), Samantha-Lynn Quinn, Natalie Benjamin, Andrew Craig Green, Weijie Wang

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Abstract

Context: The single-leg squat task is often used as a rehabilitative exercise or as a screening tool for the functional movement of the lower limb. Objective: To establish the effect of 3 different positions of the nonstance leg on 3-dimensional kinematics, muscle activity, and center of mass displacement during a single-leg squat. Design: Within-subjects, repeated-measures design. Setting: Movement analysis laboratory. Participants: A total of 10 participants, aged 28.2 (4.42) years performed 3 squats to 60° of knee flexion with the nonstance (1) hip at 90° flexion and knee at 90° flexion, (2) hip at 30° flexion with the knee fully extended, or (3) hip in neutral/0° and the knee flexed to 90°. Main Outcome Measures: Trunk, hip, knee and ankle joint angles, and center of mass displacement were recorded with inertial sensors while muscle activity was captured through wireless electromyography. Results: Most trunk flexion (21.38° [18.43°]) occurred with the nonstance hip at 90° and most flexion of the stance hip (23.10° [6.60°]) occurred with the nonstance hip at 0°. Biceps femoris activity in the 90° squat was 40% more than in the 0° squat, whereas rectus femoris activity in the 0° squat was 29% more than in the 90° squat. Conclusion: The position of the nonstance limb should be standardized when the single-leg squat is used for assessment and be adapted to the aim when used in rehabilitation.

Original languageEnglish
Pages (from-to)318-324
Number of pages7
JournalJournal of Sport Rehabilitation
Volume28
Issue number4
Early online date14 Nov 2018
DOIs
Publication statusPublished - May 2019

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Keywords

  • centre of mass
  • kinematics
  • electromyography
  • assessment
  • rehabilitation
  • Center of mass
  • Assessment
  • Kinematics
  • Electromyography
  • Rehabilitation
  • Knee Joint/physiology
  • Torso/physiology
  • Movement
  • Hip Joint/physiology
  • Quadriceps Muscle/physiology
  • Humans
  • Male
  • Ankle Joint/physiology
  • Posture
  • Young Adult
  • Biomechanical Phenomena
  • Lower Extremity/physiology
  • Adult
  • Female

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