Document Detail

Correlation of an exercise-induced increase in systemic circulation with neural retinal function in humans.
MedLine Citation:
PMID:  9181342     Owner:  NLM     Status:  MEDLINE    
Although the effects of physical exertion on intraocular pressure and systemic blood pressure are well established, the retinal response to such physiologic stress has not been examined. We studied the effect of short-term intense exercise on the principal waves in the scotopic and photopic flash electroretinograms, as well as the lower-amplitude oscillatory potentials. Sixteen healthy volunteers between 20 and 30 years of age participated in this experiment. The electroretinograms and oscillatory potentials were recorded with a Nicolet CA-1000 clinical averager, using DTL-type fiber electrodes. All retinal potentials were taken immediately before and after a minimum 20-min period of stationary bicycling that increased the heart rate to about 140 beats per minute. The electroretinograms were recorded from eyes with dilated pupils, 10 min after white-light adaptation of the right eye, and 30 min after dark adaptation of the left eye. Red flashes and dim white flashes were used to elicit photopic and scotopic electroretinograms, respectively. While no changes were recorded for any of the electroretinogram components recorded under photopic conditions, the amplitude of OP5 was decreased and the implicit time of OP4 was delayed after exercise for scotopic conditions. We concluded that exercise caused component-specific changes in the scotopic oscillatory potentials. Since it is well known that oscillatory potentials are vulnerable to ischemia, scotopic oscillatory potentials may be used as simple noninvasive indices of the reactivity of the retinal vascular autoregulatory system during exercise.
H Kergoat; P Forcier
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Documenta ophthalmologica. Advances in ophthalmology     Volume:  92     ISSN:  0012-4486     ISO Abbreviation:  Doc Ophthalmol     Publication Date:    1996-1997
Date Detail:
Created Date:  1997-07-29     Completed Date:  1997-07-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370667     Medline TA:  Doc Ophthalmol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  145-57     Citation Subset:  IM    
Université de Montréal, Québec, Canada.
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MeSH Terms
Adaptation, Ocular
Blood Pressure / physiology*
Exercise / physiology*
Exercise Test
Intraocular Pressure
Photic Stimulation
Retina / physiology*

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