Document Detail

Effect of induced alkalosis on perception of exertion during exercise recovery.
MedLine Citation:
PMID:  12423176     Owner:  NLM     Status:  MEDLINE    
In this investigation we studied the effect of manipulating the acid-base balance through sodium bicarbonate (NaHCO(3)) ingestion on ratings of perceived exertion for the overall body (RPE-O) and on differentiated ratings for the leg and chest (RPE-L, RPE-C) during exercise recovery. Six women of college age underwent 3 experimental conditions in which NaHCO(3) was ingested in either a single (bolus) or periodic (distributed throughout the exercise) dosage, with calcium carbonate serving as a placebo control. Each subject pedaled a cycle ergometer at 90% Vo(2)peak for three 5-minute exercise sessions, each separated by 10 minutes of recovery. Repeated-measures analysis of variance with Tukey post hoc analysis was performed for acid-base and perceptual variables. Results indicate that a gradient of acid-base balance was established such that pH and bicarbonate concentration were significantly greater (p < 0.05) for the single condition in comparison with periodic and placebo conditions, and the periodic condition was significantly greater (p < 0.05) than placebo. The average percentage of recovery for RPE-L and RPE-C was 8% greater (p < 0.05) for the single condition than for the periodic and placebo conditions, at the first and second minutes of recovery. During the first minute of recovery, the average percentage of recovery for RPE-O was 10% greater (p < 0.05) for the single condition than for the placebo condition. During the second minute of recovery, the percentage of recovery for RPE-O for the single condition was significantly greater than those for both the periodic and placebo conditions by an average of 9%. These results strengthen the relationship between the acid-base balance and the subjective perception of exertion. In addition, this study provides preliminary data in support of RPE as an adjunct measure to quantify the extent of recovery from exercise.
Ann Marie Swank; Robert J Robertson
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  16     ISSN:  1064-8011     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-08     Completed Date:  2003-03-18     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  491-9     Citation Subset:  IM    
Exercise Physiology Laboratory, University of Louisville, Louisville, Kentucky 40292, USA.
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MeSH Terms
Alkalosis / physiopathology*
Analysis of Variance
Blood Chemical Analysis
Body Mass Index
Case-Control Studies
Exercise Test*
Heart Rate / physiology
Oxygen Consumption / physiology
Physical Exertion / drug effects*,  physiology*
Recovery of Function
Reference Values
Sensitivity and Specificity
Sodium Bicarbonate / administration & dosage*
Time Factors
beta-Galactosidase / metabolism
Reg. No./Substance:
144-55-8/Sodium Bicarbonate; EC

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

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