Document Detail

Exercise effects stress-induced analgesia and spatial learning in rats.
MedLine Citation:
PMID:  16945396     Owner:  NLM     Status:  MEDLINE    
Previous studies indicated that intensity level may be a determining factor in the beneficial or detrimental effects of exercise on spatial memory, as chronic low-intensity level exercise appears to enhance learning and memory which stressful situations may impair. This study examines the effects of different intensity levels of acute exercise (treadmill running) on spatial memory in rats. Using the Morris water maze, spatial learning was measured in animals exposed to treadmill running at low- (20-22 m/min for 25 min daily) and high-intensity (25 m/min for 25 min daily) levels of exercise. A stress control using an electric foot shock was used to examine if the high-intensity exercise was sufficient to serve as a stressor. Stress level was estimated by examining tail flick latencies as a measure of stress-induced analgesia. The results indicate that high-intensity exercise at a level that may not induce an analgesic state is sufficient to impair early acquisition of spatial learning. However, with additional trials, all animals are capable of learning the task. Acute exposure to the electric foot shock impaired learning in the Morris water maze. Surprisingly, across all studies, there was a significantly higher analgesic state post-swim as compared to pre-swim. The results indicate that irrespective of stress level prior to water maze testing, swimming in the Morris water maze repeatedly for short durations of time is enough to induce an analgesic state.
Joshua E Blustein; Michael McLaughlin; John R Hoffman
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-09-01
Journal Detail:
Title:  Physiology & behavior     Volume:  89     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-10-30     Completed Date:  2007-01-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  582-6     Citation Subset:  IM    
Department of Psychology, Arcadia University, 450 S. Easton Road, Glenside, PA 19038, USA.
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MeSH Terms
Analgesia / psychology*
Discrimination Learning / physiology*
Escape Reaction / physiology
Maze Learning / physiology*
Pain Threshold / physiology*,  psychology
Physical Conditioning, Animal / physiology*,  psychology
Physical Exertion / physiology
Rats, Sprague-Dawley
Reaction Time / physiology
Spatial Behavior / physiology
Stress, Psychological / physiopathology*

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

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