| Catecholamine and blood lactate responses to incremental rowing and running exercise. | |
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MedLine Citation:
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PMID: 8005857 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Ten collegiate rowers performed discontinuous incremental exercise to their tolerable limit on two occasions: once on a rowing ergometer and once on a treadmill. Ventilation and pulmonary gas exchange were monitored continuously, and blood was sampled from a venous catheter located in the back of the hand or forearm for determination of blood lactate ([La]) and plasma epinephrine ([Epi]) and norepinephrine ([NE]) concentrations. Thresholds for lactate (LT), epinephrine (Epi-T), and norepinephrine (NE-T) were determined for each subject under each condition and defined as breakpoints when plotted as a function of O2 uptake (VO2). For running, LT (3.76 +/- 0.18 l/min) was lower (P < 0.05) than Epi-T (4.35 +/- 0.14 l/min) and NE-T (4.04 +/- 0.19 l/min). For rowing, LT (3.35 +/- 0.16 l/min) was lower (P < 0.05) than Epi-T (3.72 +/- 0.22 l/min) and NE-T (3.70 +/- 0.18 l/min) and was lower (P < 0.05) than LT for running. Within each mode of exercise, Epi-T and NE-T did not differ. Because LT occurred at a significantly lower VO2 than either Epi-T or NE-T, we conclude that catecholamine thresholds, per se, were not the cause of LT. However, for both modes of exercise LT occurred at a plasma [Epi] of approximately 200-250 pg/ml (rowing, 221 +/- 48 pg/ml; running, 245 +/- 45 pg/ml); these concentrations are consistent with the plasma [Epi] reported necessary for eliciting increments in blood [La] during Epi infusion at rest. Plasma [NE] at LT differed significantly between modes (rowing, 820 +/- 127 pg/ml; running, 1,712 +/- 217 pg/ml).(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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A Weltman; C M Wood; C J Womack; S E Davis; J L Blumer; J Alvarez; K Sauer; G A Gaesser |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 76 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 1994 Mar |
Date Detail:
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Created Date: 1994-07-15 Completed Date: 1994-07-15 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1144-9 Citation Subset: IM |
Affiliation:
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Exercise Physiology Laboratory, Curry School of Education, University of Virginia, Charlottesville 22903. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anaerobic Threshold / physiology Arm / physiology Catecholamines / blood* Epinephrine / blood Ergometry Exercise / physiology* Humans Lactates / blood* Lactic Acid Leg / physiology Male Norepinephrine / blood Oxygen Consumption / physiology Running* |
| Chemical | |
Reg. No./Substance:
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0/Catecholamines; 0/Lactates; 50-21-5/Lactic Acid; 51-41-2/Norepinephrine; 51-43-4/Epinephrine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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