Document Detail

Changes in soleus motoneuron pool excitability after artificial knee joint effusion.
MedLine Citation:
PMID:  10987162     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To compare changes in the magnitude of soleus motoneuron excitability before and over a 4-hour period following artificial knee effusion. DESIGN: Before-after trial. SETTING: All measurements were collected in the Sports Injury Research Laboratory, Indiana State University. PARTICIPANTS: Eleven healthy and neurologically sound volunteers (mean age +/- SD, 24 +/- 3yr; height, 173.2 +/- 9.6cm; weight, 72.9 +/- 8.7kg) with no history of lower-extremity surgery and no lower extremity pathology in the last year. INTERVENTIONS: An area superolateral to the patella was cleaned and injected subcutaneously with 2mL of lidocaine for anesthetic purposes. With a second disposable syringe, 25mL of sterile saline was injected through the superolateral knee joint capsule into the joint space to mimic mechanical joint effusion. MAIN OUTCOME MEASURE: Hoffmann's reflex (H-reflex) was elicited by applying a percutaneous stimulus to the tibial nerve in the popliteal fossa. Seven to 12 stimuli were delivered at 20-second intervals with varying intensities to find the maximal H-reflex. The maximal H-reflex was measured five times at the same stimulus intensity with 20-second rest intervals. This measurement was recorded before injection and at 1-hour intervals following the injection for 4 hours. RESULTS: An overall difference between groups was found. Measurements from hours 3 and 4 were significantly higher than the preinjection measurements (p < or = .05). CONCLUSIONS: The soleus motoneuron pool was not inhibited as expected. The soleus was facilitated beyond the preinjection level, showing that the quadriceps and soleus do not respond in the same way to artificial knee effusion. Because the quadriceps are normally inhibited during knee effusion, this facilitation could be the result of a compensatory reaction by the soleus in response to inhibited quadriceps. Further studies must be performed to determine the extent and duration of soleus motoneuron pool excitability in relation to quadriceps inhibition elicited by artificial knee effusion.
J T Hopkins; C D Ingersoll; J E Edwards; M L Cordova
Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  Archives of physical medicine and rehabilitation     Volume:  81     ISSN:  0003-9993     ISO Abbreviation:  Arch Phys Med Rehabil     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2000-09-26     Completed Date:  2000-09-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985158R     Medline TA:  Arch Phys Med Rehabil     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1199-203     Citation Subset:  AIM; IM    
Athletic Training Department, Indiana State University, Terre Haute 47809, USA.
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MeSH Terms
Analysis of Variance
Electric Stimulation
H-Reflex / physiology*
Knee Joint / physiology*
Muscle, Skeletal / drug effects,  physiology*
Sodium Chloride / pharmacology
Tibial Nerve / physiology*
Reg. No./Substance:
7647-14-5/Sodium Chloride

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

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