Document Detail


Reduced quadriceps activation after lumbar paraspinal fatiguing exercise.
MedLine Citation:
PMID:  16619099     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
CONTEXT: Although poor paraspinal muscle endurance has been associated with less quadriceps activation (QA) in persons with a history of low back pain, no authors have addressed the acute neuromuscular response after lumbar paraspinal fatiguing exercise. OBJECTIVE: To compare QA after lumbar paraspinal fatiguing exercise in healthy individuals and those with a history of low back pain. DESIGN: A 2 x 4 repeated-measures, time-series design. SETTING: Exercise and Sport Injury Laboratory. PATIENTS OR OTHER PARTICIPANTS: Sixteen volunteers participated (9 males, 7 females; 8 controls and 8 with a history of low back pain; age = 24.1 +/- 3.1 years, height = 173.4 +/- 7.1 cm, mass = 72.4 +/- 12.1 kg). INTERVENTION(S): Subjects performed 3 sets of isometric lumbar paraspinal fatiguing muscle contractions. Exercise sets continued until the desired shift in lumbar paraspinal electromyographic median power frequency was observed. Baseline QA was compared with QA after each exercise set. MAIN OUTCOME MEASURE(S): An electric burst was superimposed while subjects performed a maximal quadriceps contraction. We used the central activation ratio to calculate QA = (F(MVIC)/[F(MVIC) + F(Burst)])* 100, where F = force and MVIC = maximal voluntary isometric contractions. Quadriceps electromyographic activity was collected at the same time as QA measurements to permit calculation of median frequency during MVIC. RESULTS: Average QA decreased from baseline (87.4% +/- 8.2%) after the first (84.5% +/- 10.5%), second (81.4% +/- 11.0%), and third (78.2% +/- 12.7%) fatiguing exercise sets. On average, the group with a history of low back pain showed significantly more QA than controls. No significant change in quadriceps median frequency was noted during the quadriceps MVICs. CONCLUSIONS: The quadriceps muscle group was inhibited after lumbar paraspinal fatiguing exercise in the absence of quadriceps fatigue. This effect may be different for people with a history of low back pain compared with healthy controls.
Authors:
Joseph M Hart; Julie M Fritz; D Casey Kerrigan; Ethan N Saliba; Bruce M Gansneder; Christopher D Ingersoll
Related Documents :
11379459 - Electrical (faradic) stimulation versus active mobilization exercise in the physical ma...
18463969 - Exercise reduces c-reactive protein and improves physical function in automotive worker...
17852259 - Chronic low back pain: patients' experiences, opinions and expectations for clinical ma...
18267029 - The influence of expectation on spinal manipulation induced hypoalgesia: an experimenta...
132329 - Conservative treatment in spondylolisthesis.
18509579 - A randomized controlled trial of aquatic and land-based exercise in patients with knee ...
8725819 - Effects of furosemide on hemorheologic alterations induced by incremental treadmill exe...
11398819 - Noise-induced hearing loss among u.s. air force cryptolinguists.
11687129 - Intermittent pneumatic compression for treating venous leg ulcers.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of athletic training     Volume:  41     ISSN:  1062-6050     ISO Abbreviation:  J Athl Train     Publication Date:    2006 Jan-Mar
Date Detail:
Created Date:  2006-04-18     Completed Date:  2006-05-15     Revised Date:  2010-09-16    
Medline Journal Info:
Nlm Unique ID:  9301647     Medline TA:  J Athl Train     Country:  United States    
Other Details:
Languages:  eng     Pagination:  79-86     Citation Subset:  -    
Affiliation:
University of Virginia, Department of Orthopaedic Surgery, Charlottesville, VA 22908-0159, USA. jmh3zf@virginia.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Ipsilateral hip abductor weakness after inversion ankle sprain.
Next Document:  Physiologic considerations of therapeutic slideboard rehabilitation with an external loading device.