Open AccessEffects of sodium bicarbonate ingestion on hyperventilation and recovery of blood pH after a short-term intense exercise
Author(s) -
Takahiro Yunoki,
Ryouta Matsuura,
Takuma Arimitsu,
T. Kimura,
Toshiaki Yano
Publication year - 2009
Publication title -
physiological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.647
H-Index - 70
eISSN - 1802-9973
pISSN - 0862-8408
DOI - 10.33549/physiolres.931613
Subject(s) - hyperventilation , sodium bicarbonate , bicarbonate , chemistry , ventilation (architecture) , endocrinology , sodium , medicine , anesthesia , mechanical engineering , organic chemistry , engineering
To determine the relationship between hyperventilation andrecovery of blood pH during recovery from a heavy exercise,short-term intense exercise (STIE) tests were performed afterhuman subjects ingested 0.3 g · kg-1 body mass of either NaHCO3(Alk) or CaCO3 (Pla). Ventilation (VE) - CO2 output (V.co2) slopesduring recovery following STIE were significantly lower in Alkthan in Pla, indicating that hyperventilation is attenuated underthe alkalotic condition. However, this reduction of the slope wasthe result of unchanged VE and a small increase in V.co2. Asignificant correlation between VE and blood pH was foundduring recovery in both conditions. While there was no differencebetween the VE - pH slopes in the two conditions, VE at thesame pH was higher in Alk than in Pla. Furthermore, the valuesof pH during recovery in both conditions increased toward thepreexercise levels of each condition. Thus, although VE - V.co2 slope was decreased under the alkalotic condition, this could notbe explained by the ventilatory depression attributed to increasein blood pH. We speculate that hyperventilation after the end ofSTIE is determined by the VE - pH relationship that was setbefore STIE or the intensity of the exercise performed.