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Concentric and eccentric force-velocity relationships during electrically induced submaximal contractions

J M Kues1, T P Mayhew

  • 1Virginia Commonwealth University, Department of Physical Therapy, Richmond 23298-0224, USA.

Physiotherapy Research International : the Journal for Researchers and Clinicians in Physical Therapy
|January 1, 1996
PubMed
Summary

This study explored the force-velocity relationship in the quadriceps femoris muscle during electrically induced contractions. Findings reveal distinct force-velocity characteristics for concentric and eccentric muscle actions, mirroring in vitro results.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Muscle Physiology

Background:

  • Understanding the force-velocity relationship is crucial for muscle function analysis.
  • Electrically induced contractions offer a controlled method to study muscle mechanics.

Purpose of the Study:

  • To investigate the force-velocity relationship in the quadriceps femoris muscle.
  • To compare concentric and eccentric contraction dynamics under electrical stimulation.
  • To assess the similarity of in vivo findings to in vitro muscle studies.

Main Methods:

  • Thirty healthy female subjects participated.
  • An isokinetic dynamometer measured force.
  • Quadriceps femoris muscles were stimulated at 30% maximal voluntary isometric force.

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  • Four velocities (30, 90, 120, 180 deg/sec) were tested during concentric and eccentric contractions.

    • Main Results:

    • A significant regression model described the concentric force-velocity relationship (R2=0.96, slope=-0.76).
    • A significant regression model described the eccentric force-velocity relationship (R2=0.91, slope=0.4).
    • Both models were highly statistically significant (p < 0.0001).

    Conclusions:

    • The force-velocity relationship during electrically induced submaximal contractions is well-defined.
    • Concentric and eccentric contractions exhibit characteristic, distinct force-velocity profiles.
    • These in vivo findings align with established in vitro muscle contraction principles.