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The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Related Experiment Video

Updated: Jun 8, 2025

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Plantar flexor strength and size decrease following single-leg disuse in uninjured adults: A meta-analysis.

Nicholas Preobrazenski1, Joel Seigel2, Ian Janssen2,3

  • 1Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada.

Clinical Physiology and Functional Imaging
|November 4, 2024
PubMed
Summary
This summary is machine-generated.

Single-leg disuse significantly reduces plantar flexor strength and size in healthy adults. This meta-analysis quantifies these declines, highlighting the impact of immobilization on lower limb function.

Keywords:
calf musclecomputed tomographyhumanimmobilisationmagnetic resonance imagingmuscle disuseunloadingunweighting

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Area of Science:

  • Physiology
  • Biomechanics
  • Exercise Science

Background:

  • Plantar flexors are crucial for locomotion and balance.
  • Previous studies show single-leg disuse impacts plantar flexor strength and size.
  • No meta-analysis has quantified these effects in uninjured adults.

Purpose of the Study:

  • To quantitatively assess changes in plantar flexor strength.
  • To quantitatively assess changes in plantar flexor size.
  • To analyze effects of single-leg disuse in uninjured adults.

Main Methods:

  • Meta-analysis of 19 studies using unilateral lower limb immobilization (cast/brace).
  • Included studies published up to January 30, 2022.
  • Analyzed original research reporting plantar flexor strength and size measures.

Main Results:

  • Single-leg disuse decreased plantar flexor strength (Hedges g = -0.71).
  • Plantar flexor size also decreased (Hedges g = -0.33).
  • Effects observed across various disuse durations (7-35 days).

Conclusions:

  • Single-leg disuse leads to significant reductions in plantar flexor strength and size.
  • Findings align with meta-analyses on knee extensor declines.
  • Future research should include more females and older adults.