| Ventilation parallels plasma potassium during incremental and continuous variable intensity exercise. | |
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MedLine Citation:
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PMID: 7890458 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim of the present investigation was to examine the relationship between plasma potassium (K+) and ventilation (VE) during incremental and prolonged continuous exercise which varied between low and moderate intensity. Seven well-trained male cyclists who had a mean maximal aerobic power (VO2max) of 69.4 +/- 2.9 ml/kg/min were recruited to participate as subjects. The graded incremental exercise bout was composed of 3 min stages set to elicit 40, 50, 60, 70, 80 and 90% VO2max. The continuous variable intensity exercise consisted of 30 min of cycling at 45% VO2max and then 6 x 16 min periods which consisted of cycling for 8 min at 75% VO2max and 8 min at 45% VO2max. During prolonged continuous exercise, VE and plasma K+ changed in a coordinated manner between the low and moderate intensity exercise bouts with the responses during the moderate intensity intervals being significantly greater (p < 0.05) than the responses during the low intensity intervals. During the incremental exercise test, a strong positive relationship between VE and plasma K+ concentration was found for each subject. However, a positive relationship and slope was also found when the VE/K+ ratio was correlated with exercise intensity (r = 0.90-0.99). This indicates that with increasing exercise intensity, the rise in VE becomes increasingly greater than the rise in plasma K+. These findings suggest that the plasma K+ concentration contributes to but may not be the sole determinant of ventilatory regulation during exercise. |
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Authors:
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B B Yaspelkis; P A Anderla; J G Patterson; J L Ivy |
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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: International journal of sports medicine Volume: 15 ISSN: 0172-4622 ISO Abbreviation: Int J Sports Med Publication Date: 1994 Nov |
Date Detail:
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Created Date: 1995-04-20 Completed Date: 1995-04-20 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: GERMANY |
Other Details:
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Languages: eng Pagination: 460-5 Citation Subset: IM; S |
Affiliation:
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Department of Kinesiology, University of Texas at Austin 78712. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Exercise / physiology* Humans Male Muscle Contraction / physiology Muscle, Skeletal / physiology* Oxygen Consumption / physiology Potassium / blood* Respiration / physiology* |
| Chemical | |
Reg. No./Substance:
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7440-09-7/Potassium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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