Effect of fatiguing maximal isokinetic quadriceps contractions on ability to estimate knee-position.
This randomized controlled study compared the accuracy of knee positioning by 8 women after fatiguing maximal isokinetic contractions of the quadriceps with those of 8 controls who performed no exercise. The mean algebraic error (AE) and variable error (VE) showed a significant posttest improvement for the control group after a 5-min, intertrial period. There was no change in accuracy of knee positioning postexercise, however, for the experimental group. These findings suggest that, while a single bout of fatiguing knee exercises may not alter absolute accuracy of knee positioning, the movements may undermine the relative proficiency attainable by learning. They suggest a role for central as well as peripheral mechanisms in mediating this sensory modality.
Marks
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Department of Physical Therapy, University of Alberta, Edmonton, Canada.
Quinney
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HA
D000293:Adolescent; D000328:Adult; D005221:Fatigue / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D007699:Kinesthesis / Q000502:physiology; D007719:Knee Joint / Q000294:innervation / Q000502:physiology*; D010525:Peripheral Nerves / Q000503:physiopathology; D011434:Proprioception / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology