Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2006) 05, 70 - 79

Research article
Contribution of Hamstring Fatigue to Quadriceps Inhibition Following Lumbar Extension Exercise
Joseph M. Hart1, , D. Casey Kerrigan1, Julie M. Fritz2, Ethan N. Saliba1, Bruce Gansneder1, Christopher D. Ingersoll1
Author Information
1 Department of Orthopaedic Surgery, Sports Medicine Division, University of Virginia, USA
2 Division of Physical Therapy, College of Health, Salt Lake City, UT, USA

Joseph M. Hart
‚úČ University of Virginia, 400 Ray C. Hunt Dr., Suite 330, P.O. Box 800159, Charlottesville, VA 22908-0159, USA
Email: joehart@virginia.edu
Publish Date
Received: 04-10-2005
Accepted: 22-12-2005
Published (online): 01-03-2006
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ABSTRACT

The purpose of this study was to determine the contribution of hamstrings and quadriceps fatigue to quadriceps inhibition following lumbar extension exercise. Regression models were calculated consisting of the outcome variable: quadriceps inhibition and predictor variables: change in EMG median frequency in the quadriceps and hamstrings during lumbar fatiguing exercise. Twenty-five subjects with a history of low back pain were matched by gender, height and mass to 25 healthy controls. Subjects performed two sets of fatiguing isometric lumbar extension exercise until mild (set 1) and moderate (set 2) fatigue of the lumbar paraspinals. Quadriceps and hamstring EMG median frequency were measured while subjects performed fatiguing exercise. A burst of electrical stimuli was superimposed while subjects performed an isometric maximal quadriceps contraction to estimate quadriceps inhibition after each exercise set. Results indicate the change in hamstring median frequency explained variance in quadriceps inhibition following the exercise sets in the history of low back pain group only. Change in quadriceps median frequency explained variance in quadriceps inhibition following the first exercise set in the control group only. In conclusion, persons with a history of low back pain whose quadriceps become inhibited following lumbar paraspinal exercise may be adapting to the fatigue by using their hamstring muscles more than controls.

Key words: Superimposed burst technique, electromyography, spectral median frequency, correlation and regression, low back pain


           Key Points
  • A neuromuscular relationship between the lumbar paraspinals and quadriceps while performing lumbar extension exercise may be influenced by hamstring muscle fatigue.
  • QI following lumbar extension exercise in persons with a history of LBP group may involve significant contribution from the hamstring muscle group.
  • More hamstring muscle contribution may be a necessary adaptation in the history of LBP group due to weaker and more fatigable lumbar extensors.
 
 
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