Ventilation parallels plasma potassium during incremental and continuous variable intensity exercise
Deutscher übersetzter Titel: | Bei Muskelarbeit von ansteigender Intensitaet und bei kontinuierlicher, unterschiedlich intensiver koerperlicher Belastung verlaeuft das Atemminutenvolumen parallel zur Plasmakonzentration von Kalium |
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Autor: | Yaspelkis, B.B.; Anderla, P.A.; Patterson, J.G.; Ivy, J.L. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 15 (1994), 8, S. 460-465, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-1021088 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199508102443 |
Quelle: | BISp |
Abstract des Autors
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 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. Verf.-Referat