| Effect of training status and relative exercise intensity on physiological responses in men. | |
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MedLine Citation:
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PMID: 10994919 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: This study examined the effect of training status and relative exercise intensity on physiological responses to endurance exercise in humans. METHODS: Seven endurance trained (TR: peak oxygen uptake [VO2peak] = 65.8 +/- 2.4 mL x kg(-1) min(-1)) and six untrained (UT: VO2peak = 46.2 +/- 1.9 mL x kg(-1) x min(-1)) men cycled for 60 min, either at a work rate corresponding to approximately 70% VO2peak or approximately 95% lactate threshold (LT). RESULTS: The work rate and relative exercise intensity (i.e., % VO2peak) for UT 95% LT were lower (P < 0.01) than for all of the other trials. Although the work rate for UT 70% VO2peak was lower (P < 0.001) than for TR 70% VO2peak and TR 95% LT, average heart rate (HR) for the trial was higher (P < 0.01) throughout exercise in UT 70% VO2peak compared with all of the other trials. Plasma lactate and ammonia concentrations were greater (P < 0.01) during exercise in UT 70% VO2peak compared with all of the other trials. There was a tendency (P = 0.077) for plasma hypoxanthine to be greater at 60 min in UT 70% VO2peak compared with the other trials. At no time were any of the plasma metabolite concentrations different between the UT 95% LT, TR 95% LT and TR 70% VO2peak trials. CONCLUSIONS: These data demonstrate that HR and plasma markers of metabolic stress were greater in UT compared with TR when exercise was performed at 70% VO2peak but were similar during exercise at 95% LT. |
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Authors:
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J Baldwin; R J Snow; M A Febbraio |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 32 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2000 Sep |
Date Detail:
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Created Date: 2000-12-26 Completed Date: 2001-01-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1648-54 Citation Subset: IM; S |
Affiliation:
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Department of Physiology, The University of Melbourne, Parkville, Victoria, Australia. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Ammonia / blood Biological Markers / blood Exercise / physiology* Heart Rate Humans Lactic Acid / blood Male Oxygen Consumption Physical Endurance / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Biological Markers; 50-21-5/Lactic Acid; 7664-41-7/Ammonia |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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