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Related Experiment Videos

Core strength and lower extremity alignment during single leg squats.

John D Willson1, Mary Lloyd Ireland, Irene Davis

  • 1University of Delaware, Department of Physical Therapy, Newark, 19716, USA, jdwillson@yahoo.com

Medicine and Science in Sports and Exercise
|May 5, 2006
PubMed
Summary

Female athletes exhibit greater knee frontal plane projection angle (FPPA) and reduced muscle strength during single leg squats compared to males. Hip external rotation strength is most associated with FPPA, highlighting potential injury risk factors.

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Human Movement Analysis

Background:

  • Trunk, hip, and knee muscles are crucial for lower extremity stability during weight-bearing activities.
  • Understanding sex-based differences in lower extremity mechanics is vital for injury prevention.

Purpose of the Study:

  • Compare lower extremity orientation during single leg (SL) squats between male and female athletes.
  • Compare trunk, hip, and knee muscle strength between sexes.
  • Evaluate the association between muscle strength and knee joint orientation during SL squats.

Main Methods:

  • Assessed peak isometric torque for trunk, hip, and knee muscle actions in 24 males and 22 females.
  • Measured the frontal plane projection angle (FPPA) of the knee during a 45-degree SL squat.

Related Experiment Videos

  • Utilized photo editing software for FPPA analysis.

    • Main Results:

    • Females demonstrated greater FPPA during SL squats, indicating a tendency towards more extreme knee valgus.
    • Males and females exhibited opposite movement directions during the SL squat.
    • Females generally produced less isometric torque across most muscle groups, except for trunk extension.

    Conclusions:

    • Female athletes present with increased FPPA and generally lower isometric torque in trunk, hip, and knee muscles.
    • Hip external rotation strength was identified as the strongest predictor of FPPA during SL squats.
    • Findings suggest potential sex-based differences in biomechanical control and muscle function relevant to clinical settings.