title: Effects of humoral factors on ventilation kinetics during recovery after impulse-like exercise.
abstract: To clarify the ventilatory kinetics during recovery after impulse-like exercise, subjects performed one impulse-like exercise test (one-impulse) and a five-times repeated impulse-like exercises test (five-impulse). Duration and intensity of the impulse-like exercise were 20 sec and 400 watts (80 rpm), respectively. Although blood pH during recovery (until 10 min) was significantly lower in the five-impulse test than in the one-impulse test, ventilation (.VE) in the two tests was similar except during the first 30 sec of recovery, in which it was higher in the five-impulse test. In one-impulse, blood CO2 pressure (PCO2) was significantly increased at 1 min during recovery and then returned to the pre-exercise level at 5 min during recovery. In the five-impulse test, PCO2 at 1 min during recovery was similar to the pre-exercise level, and then it decreased to a level lower than the pre-exercise level at 5 min during recovery. Accordingly, PCO2 during recovery (until 30 min) was significantly lower in the five-impulse than in one-impulse test..VE and pH during recovery showed a curvilinear relationship, and at the same pH, ventilation was higher in the one-impulse test. These results suggest that ventilatory kinetics during recovery after impulse-like exercise is attributed partly to pH, but the stimulatory effect of lower pH is diminished by the inhibitory effect of lower PCO2.
authors: Laboratory of Exercise Physiology, Hokkaido University, Sapporo, Japan.
authors: R
authors: R
authors: Afroundeh
authors: T
authors: T
authors: Arimitsu
authors: R
authors: R
authors: Yamanaka
authors: C
authors: C
authors: Lian
authors: T
authors: T
authors: Yunoki
authors: Tokuo
authors: T
authors: Yano
mesh_terms: D001639:Bicarbonates / Q000097:blood; D015415:Biomarkers / Q000097:blood; D001784:Blood Gas Analysis; D002245:Carbon Dioxide / Q000097:blood*; D015444:Exercise; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010100:Oxygen / Q000097:blood*; D012123:Pulmonary Ventilation; D020127:Recovery of Function; D055815:Young Adult
chemical_list: D001639:Bicarbonates; D015415:Biomarkers; D002245:Carbon Dioxide; D019344:Lactic Acid; D010100:Oxygen