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Anatomical predictors of maximum isometric and concentric knee extensor moment

Abstract

The most important anatomical determinants of in vivo joint moment magnitude have yet to be defined. Relationships between maximal knee extensor moment and quadriceps muscle volume, anatomical (ACSA) and physiological (PCSA) cross-sectional area, muscle architecture and moment arm (MA) were compared. Nineteen untrained men and women performed maximal isokinetic knee extensions under isometric conditions (90° joint angle) and at 30° and 300° s−1. Magnetic resonance and ultrasound imaging techniques were used to measure vastus lateralis PCSA and fascicle length (FL), quadriceps ACSA, volume and patellar tendon MA. Muscle volume was the best predictor of extensor moment measured isometrically (R 2 = 0.60) and at 30° s−1 (R 2 = 0.74). PCSA × FL was the best predictor of moment at 300° s−1 (R 2 = 0.59). MA was not an important predictor. ACSA was the second best predictor at all three speeds and could be recommended as an ideal measure given its relative ease of measurement.

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Correspondence to Anthony J. Blazevich.

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Blazevich, A.J., Coleman, D.R., Horne, S. et al. Anatomical predictors of maximum isometric and concentric knee extensor moment. Eur J Appl Physiol 105, 869–878 (2009). https://doi.org/10.1007/s00421-008-0972-7

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  • DOI: https://doi.org/10.1007/s00421-008-0972-7

Keywords

  • Muscle strength
  • Skeletal muscle
  • Concentric
  • Muscle architecture
  • Moment arm
  • Fascicle