Document Detail

Effect of varying light intensity on maximal power production and selected metabolic variables.
MedLine Citation:
PMID:  11935384     Owner:  NLM     Status:  MEDLINE    
This study was designed to examine the effect of exposure to two levels of light intensity (bright; 5000 lux, dim; 50 lux) prior to supramaximal cycle exercise on performance and metabolic alterations. The exercise was performed after bright and dim light exposure for 90 minutes. Ten male long-distance runners volunteered to take part in the study. They performed 45-sec supramaximal exercise using a cycle ergometer in a 500-lux. Mean power output was measured during the exercise. Lactate and ammonia in the blood and epinephrine and norepinephrine concentrations in plasma were measured at rest immediately after bright and dim light exposures and after the exercise. Bright and dim light exposure prior to exercise did not significantly affect the power output during the exercise. Blood glucose concentration immediately after exercise and plasma epinephrine during the resting period were significantly lower after bright light exposure compared with dim light exposure (p < 0.05). No significant difference was found in blood lactate, ammonia, or plasma norepinephrine levels after exercise following bright and dim light exposures. This study demonstrated that bright light stimulation prior to supramaximal exercise decreases glucose and epinephrine levels, but is not related to physical performance.
T Ohkuwa; H Itoh; T Yamamoto; H Yanagi; Y Yamazaki; T Akimaru
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of physiology and biochemistry     Volume:  109     ISSN:  1381-3455     ISO Abbreviation:  Arch. Physiol. Biochem.     Publication Date:  2001 Dec 
Date Detail:
Created Date:  2002-04-05     Completed Date:  2002-06-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9510153     Medline TA:  Arch Physiol Biochem     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  430-4     Citation Subset:  IM    
Department of General Studies, Nagoya Institute of Technology, Nagoya, Showa-ku, Japan.
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MeSH Terms
Ammonia / blood*
Bicycling / physiology*
Epinephrine / blood*
Exercise / physiology*
Heart Rate / physiology
Lactates / blood*
Norepinephrine / blood*
Physical Education and Training
Physical Endurance / physiology*
Reg. No./Substance:
0/Lactates; 51-41-2/Norepinephrine; 51-43-4/Epinephrine; 7664-41-7/Ammonia

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

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