Document Detail

The short-term influence of exercise on axial length and intraocular pressure.
MedLine Citation:
PMID:  21423141     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of this study is to investigate the short-term influence of a period of dynamic exercise on axial length (AXL) and intraocular pressure (IOP) in young adult subjects.
PATIENTS AND METHODS: In all, 20 young adult subjects (10 myopes and 10 emmetropes) participated. Baseline measures of ocular biometrics, IOP and ocular pulse amplitude (OPA) were taken following a 20-min rest period. Subjects then performed 10 min of moderate intensity, low impact dynamic exercise (bicycle ergometry). Measures of ocular biometrics, IOP and OPA were repeated immediately after, and then 5 and 10 min after this exercise task. Systemic blood pressure and pulse rate were also monitored. A repeated measures analysis of variance was used to investigate the changes in the measured parameters.
RESULTS: Exercise resulted in significant changes in a range of ocular parameters. A small but significant decrease in AXL was observed following exercise (P<0.0001). The largest change in AXL was noted immediately following exercise (mean decrease -17±10 μm). IOP and OPA also decreased significantly following exercise (P<0.0001). A moderate but significant positive association was found between the changes in AXL and the changes in IOP (r(2)=0.36, P<0.0001). There were no significant differences found between the myopic and emmetropic subjects in the magnitude of changes observed in ocular parameters following exercise.
CONCLUSION: The physiological effects of dynamic exercise lead to changes in a range of ocular parameters, including significant reductions in IOP, OPA and decreases in AXL.
S A Read; M J Collins
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-03-18
Journal Detail:
Title:  Eye (London, England)     Volume:  25     ISSN:  1476-5454     ISO Abbreviation:  Eye (Lond)     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-06-09     Completed Date:  2011-09-08     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  8703986     Medline TA:  Eye (Lond)     Country:  England    
Other Details:
Languages:  eng     Pagination:  767-74     Citation Subset:  IM    
Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia.
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MeSH Terms
Analysis of Variance
Axial Length, Eye / physiology*
Emmetropia / physiology
Exercise / physiology*
Eye / blood supply
Intraocular Pressure / physiology*
Myopia / physiopathology
Regional Blood Flow / physiology
Young Adult

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