The relationships between isokinetic peak torque and cross-sectional area of the forearm flexors and extensors

Dona J. Housh, Terry J. Housh, Glen O. Johnson, Wei Kom Chu

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The purpose of this investigation was to use magnetic resonance imaging (MRI) to examine the relationships between the cross-sectional area (CSA) of the flexors and extensors of the forearm and isokinetic peak torque at speeds of contraction from zero to 300 deg/sec. Ten men (mean ± SO = 23.9 ± 4.5 years) volunteered as subjects for this study. Peak torque values for flexion and extension of the forearm were determined at 0, 60, 120, 180, 240, and 300 deg/sec using a Cybex II isokinetic dynamometer. For the forearm flexors, the only significant (p < 0.05) correlations between muscle CSA and peak torque were at zero (r = 0.73), 60 (r = 0.85), and 120 deg/sec (r = 0.76). There were no significant (p > 0.05) correlations for the forearm extensors. It is likely that these findings were most influenced by the contribution of primarily fast-twitch fibers to peak torque at fast speeds of contraction and the differences in architecture (parallel versus pennate fiber orientation) of the forearm flexors versus extensor muscles.

Original languageEnglish (US)
Pages (from-to)133-138
Number of pages6
JournalIsokinetics and Exercise Science
Volume3
Issue number3
DOIs
StatePublished - 1993

Keywords

  • Correlation
  • Cross-sectional area
  • Forearm flexors and extensors
  • Magnetic resonance imaging
  • Peak isokinetic torque

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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