| Respiratory alkalosis: no effect on blood lactate decline or exercise performance. | |
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MedLine Citation:
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PMID: 3203664 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It was the purpose of this study to determine the effects of respiratory alkalosis before and after high intensity exercise on recovery blood lactate concentration. Five subjects were studied under three different acid-base conditions before and after 45 s of maximal effort exercise: 1) hyperventilating room air before exercise (Respiratory Alkalosis Before = RALB, 2) hyperventilating room air during recovery (Respiratory Alkalosis After = RALA), and 3) breathing room air normally throughout rest and recovery (Control = C). RALB increased blood pH during rest to 7.65 +/- 0.03 while RALA increased blood pH to 7.57 +/- 0.03 by 40 min of recovery. Neither alkalosis treatment had a significant effect on blood lactate concentration during recovery. The peak lactate values of 12.3 +/- 1.2 mmol.L-1 for C, 11.8 +/- 1.2 mmol.L-1 for RALB, and 10.2 +/- 0.9 mmol.L-1 for RALA were not significantly different, nor were the half-times (t 1/2) for the decline in blood lactate concentration; C = 18.2 min, RALB = 19.3 min, and RALA = 18.2 min. In C, RALB and RALA, the change in base excess from rest to postexercise was greater than the concomitant increase in blood lactate concentration, suggesting the presence of a significant amount of acid in the blood in addition to lactic acid. There was no significant difference in either the total number of cycle revolutions (C = 77 +/- 2, RALB = 77 +/- 1) or power output at 5 s intervals between RALB and C during the 45 s.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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J A Morrow; R D Fell; L B Gladden |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: European journal of applied physiology and occupational physiology Volume: 58 ISSN: 0301-5548 ISO Abbreviation: Eur J Appl Physiol Occup Physiol Publication Date: 1988 |
Date Detail:
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Created Date: 1989-01-31 Completed Date: 1989-01-31 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY, WEST |
Other Details:
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Languages: eng Pagination: 175-81 Citation Subset: IM |
Affiliation:
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Division of Allied Health, School of Medicine, University of Louisville, KY 40292. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Alkalosis, Respiratory / blood* Exercise* Humans Hydrogen-Ion Concentration Lactates / blood* Lactic Acid Male Osmolar Concentration |
| Chemical | |
Reg. No./Substance:
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0/Lactates; 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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