Document Detail

Ventilation parallels plasma potassium during incremental and continuous variable intensity exercise.
MedLine Citation:
PMID:  7890458     Owner:  NLM     Status:  MEDLINE    
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.
B B Yaspelkis; P A Anderla; J G Patterson; J L Ivy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sports medicine     Volume:  15     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1994 Nov 
Date Detail:
Created Date:  1995-04-20     Completed Date:  1995-04-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  460-5     Citation Subset:  IM; S    
Department of Kinesiology, University of Texas at Austin 78712.
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MeSH Terms
Exercise / physiology*
Muscle Contraction / physiology
Muscle, Skeletal / physiology*
Oxygen Consumption / physiology
Potassium / blood*
Respiration / physiology*
Reg. No./Substance:

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