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Static pre-load effect on knee extensor isokinetic concentric and eccentric performance.

R C Jensen1, B Warren, C Laursen

  • 1Department of Physical Therapy, Sargent College of Allied Health Professions, Boston University, MA 02215.

Medicine and Science in Sports and Exercise
|January 1, 1991
PubMed
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Applying a high static pre-load significantly increases knee extensor torque during concentric and eccentric contractions. This finding is crucial for understanding muscle performance under varying load conditions.

Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Musculoskeletal Research

Background:

  • Static pre-load can influence muscle performance.
  • Understanding its effect on knee extensor contractions is important for sports and rehabilitation.

Purpose of the Study:

  • To investigate the impact of two static pre-load levels on isokinetic concentric (CON) and eccentric (ECC) knee extensor performance.
  • To analyze torque production across the range of motion (ROM) under different pre-load conditions.

Main Methods:

  • Thirty-five healthy subjects performed knee extensor CON and ECC contractions.
  • Two pre-load levels were applied: 50 N (low) and 75% maximal voluntary isometric contraction (high).
  • Statistical analysis included two-way ANOVA and Newman-Keuls post hoc tests.

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Main Results:

  • High pre-load significantly increased torque at specific degrees concentrically and eccentrically.
  • Average torque values for both CON and ECC were significantly different between pre-load conditions.
  • Peak torque did not differ significantly, but peak torque angle shifted with CON contractions.

Conclusions:

  • Static pre-load significantly affects knee extensor torque output, particularly average torque.
  • The magnitude of pre-load is a critical factor influencing muscle performance during isokinetic testing.
  • Findings have implications for optimizing training and rehabilitation protocols.