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Trunk muscle strength in eccentric and concentric lateral flexion.

Q M Huang1, A Thorstensson

  • 1Department of Neuroscience, Karolinska Institutet, University College of Physical Education and Sports, Stockholm, Sweden. qiang-min.huang@neuro.ki.se

European Journal of Applied Physiology
|February 24, 2001
PubMed
Summary

Trunk lateral flexor muscles produce higher eccentric torque than concentric or static. Increasing contraction speed did not affect eccentric torque but decreased concentric torque in healthy males.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Kinesiology

Background:

  • Understanding trunk muscle strength is crucial for injury prevention and rehabilitation.
  • Investigating the biomechanical properties of trunk muscles provides insights into functional movement limitations.

Purpose of the Study:

  • To examine how position and velocity influence the torque output of trunk lateral flexor muscles.
  • To compare eccentric, concentric, and static strength characteristics of these muscles.

Main Methods:

  • Twelve healthy male volunteers performed isokinetic and static trunk lateral flexion.
  • Torque was measured at various velocities (15-60°/s) and positions (-20° to 20°).
  • Eccentric, concentric, and static strength measurements were recorded.

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Main Results:

  • Eccentric torque (211-218 Nm) was significantly higher than concentric (66-140 Nm) and static (80-172 Nm) torque.
  • Peak torque occurred at 11-15° contralateral flexion for both eccentric and concentric actions.
  • Eccentric torque was velocity-independent, while concentric torque decreased with increasing velocity.

Conclusions:

  • Trunk lateral flexor muscles exhibit distinct strength characteristics across different contraction types and velocities.
  • Eccentric contractions generate greater torque, and this is not affected by speed.
  • Findings suggest velocity-dependent limitations in concentric trunk actions, differing from some complex movement studies.