Document Detail


Effects of physical effort on neuroretinal function in athletes and non-athletes: an electroretinographic study.
MedLine Citation:
PMID:  19882534     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Physical exertion may disturb retinal function. We wondered whether different levels of physical performance could affect the plot of neuroretinal activity after dynamic exercise in healthy subjects. The aim of our study was to estimate the effect of increasing intensity physical exercise on retinal activity in 2 groups: athletes (n=10) and non-athletes (n=10). METHODS: We analyzed the amplitude and implicit time of b-wave electroretinogram (ERG) responses for a photopic white 30-Hz flicker stimulus. Using a cycloergometer, 3 10-minute effort tests with increasing intensity were performed. Each participant was attributed an individual workload value (W) below his lactate threshold (40% VO2max), at his lactate threshold (65%-75% VO2max), and above his lactate threshold (80% VO2max). Five ERG recordings were taken: before the efforts (first), immediately after the 3 consecutive efforts (second to fourth), and 1 hour after the last effort (fifth). RESULTS: After the first effort, in both groups we observed a statistically significant increase in b-wave amplitude (p<0.05), and in non-athletes a decrease in implicit time of b-wave (p<0.05). After the last effort, we observed a decreased b-wave amplitude in non-athletes, whereas in athletes the amplitude remained at a high level. CONCLUSIONS: Physical effort significantly differentiated the plot of b-wave amplitude changes between athletes and non-athletes. These findings suggest that strenuous physical effort may disturb signal transfer in the inner retinal layer in non-athletic subjects. The ERGs may be used as a neurophysiologic indicator in defining the cardiovascular training status of an athlete.
Authors:
Teresa Zwierko; Damian M Czepita; Wojciech Lubinski; Anna Lubkowska
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of ophthalmology     Volume:  20     ISSN:  1120-6721     ISO Abbreviation:  Eur J Ophthalmol     Publication Date:    2010 Mar-Apr
Date Detail:
Created Date:  2010-03-11     Completed Date:  2010-07-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9110772     Medline TA:  Eur J Ophthalmol     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  381-8     Citation Subset:  IM    
Affiliation:
Department of Natural Sciences, University of Szczecin, Szczecin, Poland. teresa.zwierko@univ.szczecin.pl
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MeSH Terms
Descriptor/Qualifier:
Electroretinography / methods*
Exercise Test
Humans
Lactic Acid / blood
Male
Photic Stimulation
Physical Exertion / physiology*
Retinal Neurons / physiology*
Volleyball / physiology*
Young Adult
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

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


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