Document Detail

Plasma K+ changes during intense exercise in endurance-trained and sprint-trained subjects.
MedLine Citation:
PMID:  7976408     Owner:  NLM     Status:  MEDLINE    
Active muscle releases K+, and the plasma K+ concentration is consequently raised during exercise. K+ is removed by the Na,K pump, and training may influence the number of pumps. The plasma K+ concentration was therefore studied in five endurance-trained (ET) and six sprint-trained (ST) subjects during and after 1 min of exhausting treadmill running. Non-exhausting bouts of exercise at either lower speed or of shorter duration were also carried out. Blood samples were taken from a catheter in the femoral vein before and at frequent intervals after exercise. The pre-exercise venous plasma [K+] was (mean +/- SEM) 3.68 +/- 0.10 mmol l-1 (ET) and 3.88 +/- 0.06 mmol l-1 (ST). One minute of exhausting exercise was sustained at 5.27 +/- 0.08 m s-1 (ET) and 5.59 +/- 0.06 m s-1 (ST) and caused the plasma K+ concentration to rise by 4.4 +/- 0.3 (ET) and 4.7 +/- 0.3 mmol l-1 (ST; ns) respectively. Three minutes after exercise the K+ concentration was 0.48 +/- 0.08 mmol l-1 (ST) and 0.50 +/- 0.07 mmol l-1 (ST) below the pre-exercise value. During the following 6 min of recovery, the value was unchanged for the ET subjects, while a 0.32 +/- 0.06 mmol l-1 rise was seen for the ST subjects. Exercise at reduced intensity or of reduced duration resulted in smaller changes in the K+ concentration both during exercise and in the post-exercise recovery, and for each subject the lowest post-exercise K+ concentration was therefore inversely related to the peak K+ concentration during exercise.(ABSTRACT TRUNCATED AT 250 WORDS)
J I Medbø; O M Sejersted
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  151     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  1994 Jul 
Date Detail:
Created Date:  1994-12-02     Completed Date:  1994-12-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  363-71     Citation Subset:  IM    
Department of Physiology, National Institute of Occupational Health, Oslo, Norway.
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MeSH Terms
Exercise / physiology*
Oxygen Consumption / physiology
Physical Education and Training*
Physical Endurance / physiology*
Potassium / blood*
Reg. No./Substance:

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