title: Relationship between ventilation and arterial potassium concentration during incremental exercise and recovery.
abstract: The purpose of this study was to compare the relationship of ventilation (VE) with pH, arterial concentrations of potassium [( K+]a), bicarbonate [( HCO3-]a), lactate [( la]a), and acid-base parameters which would affect hyperpnoea during exercise and recovery. To assess this relationship, ten healthy male subjects exercised with intensity increasing as a ramp function of 20 W.min-1 until voluntary exhaustion and they were then allowed a 5-min recovery period. Breath-by-breath gas exchange data, [HCO3-]a, pH, [la]a, [K+]a and blood gases were determined during both exercise and recovery. Using a linear regression method, the VE/[K+]a relationship was analysed during both exercise and recovery. Several interesting results were obtained: a significant relationship between [K+]a and VE was observed during recovery as well as during exercise; the VE at any given values of [K+]a was significantly higher during recovery than during exercise and out of those factors affecting exercise hyperpnoea, only [K+]a had a similar time-course to VE during recovery. Changes in [K+]a during recovery were shown to occur significantly faster than VE with an [K+]a time constant of 70.0 s, SD 16.2 as opposed to 105.5 s, SD 10.0 for VE (P less than 0.01). These results provided further evidence that [K+]a might play an important role as a substance which can stimulate exercise hyperpnoea as has been suggested by other workers. The present study also showed that during recovery [K+]a contributed significantly to the control of VE.
authors: Exercise Physiology Laboratory, Faculty of Health and Sport Sciences, Osaka University, Japan.
authors: T
authors: T
authors: Yoshida
authors: M
authors: M
authors: Chida
authors: M
authors: M
authors: Ichioka
authors: K
authors: K
authors: Makiguchi
authors: J
authors: J
authors: Eguchi
authors: M
authors: M
authors: Udo
mesh_terms: D000328:Adult; D001158:Arteries; D001639:Bicarbonates / Q000097:blood; D002245:Carbon Dioxide / Q000097:blood; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007773:Lactates / Q000097:blood; D019344:Lactic Acid; D008297:Male; D010100:Oxygen / Q000097:blood; D011188:Potassium / Q000097:blood*; D012119:Respiration / Q000502:physiology*
chemical_list: D001639:Bicarbonates; D007773:Lactates; D002245:Carbon Dioxide; D019344:Lactic Acid; D011188:Potassium; D010100:Oxygen