Document Detail

The effect of exercise on the presence of leukocytes, erythrocytes and collagen fibers in skeletal muscle after contusion.
MedLine Citation:
PMID:  7790786     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine the comparative rate of resolution of a contusion resulting from mechanical trauma to skeletal muscle, as a function of one of four exercise regimens. DESIGN: Randomized control trial. The four exercise regimens were: running with its onset immediately after injury, running with a 72 hr delay after injury, swimming with immediate onset, or swimming with a 72 hr delay. Control did not exercise. SETTING: Small-animal laboratory. PARTICIPANTS: Male Sprague-Dawley rats. INTERVENTION: A small animal traumatizing machine applied to the biceps femoris. MAIN OUTCOME MEASURES: The rate of contusion resolution was determined by a manual count of erythrocytes, leukocytes and collagen fibers in the contusion, and the data were analyzed using analysis of variance. RESULTS: Exercise of any type produced a greater decline in erythrocyte count (28.2% after 32 days vs. control) than no exercise. Immediate onset of any of the exercise regimens after injury resulted in a greater decline in erythrocyte count (32.7% after 32 days vs. control) and in leukocyte count (17.3% after 32 days vs. control) than delayed onset. Running with either immediate or delayed onset of exercise after injury produced a greater decline in erythrocyte count (36.2% after 32 days vs. control) than swimming. Running with its onset immediately after injury produced the greatest overall rate of decrease in erythrocyte count (44.8% after 32 days vs. control), and the second greatest overall rate of decrease in leukocyte count (15.0% after 32 days vs. control). CONCLUSIONS: Running with immediate onset is the regimen of choice. Any of the given exercises is preferable to no exercise, immediate onset of exercise is preferable to delayed onset, and running is preferable to swimming.
T M Gregory; R A Heckmann; R S Francis
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of manipulative and physiological therapeutics     Volume:  18     ISSN:  0161-4754     ISO Abbreviation:  J Manipulative Physiol Ther     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-07-24     Completed Date:  1995-07-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7807107     Medline TA:  J Manipulative Physiol Ther     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  72-8     Citation Subset:  IM; S    
Department of Physical Education--Sports, Brigham Young University, USA.
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MeSH Terms
Analysis of Variance
Collagen / metabolism*
Contusions / blood,  immunology,  physiopathology*
Erythrocyte Count
Leukocyte Count
Muscle, Skeletal / immunology,  metabolism,  physiology*
Physical Exertion / physiology*
Rats, Sprague-Dawley
Reg. No./Substance:

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

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