Sodium bicarbonate ingestion does not alter the slow component of oxygen uptake kinetics in professional cyclists.
We examined the effects of pre-exercise sodium bicarbonate (NaHCO3) ingestion on the slow component of oxygen uptake (VO2) kinetics in seven professional road cyclists during intense exercise. One hour after ingesting either a placebo or NaHCO3 (0.3 g x kg body mass(-1)), each cyclist (age, 25 +/- 2 years; VO2max, 74.7 +/- 5.9 ml x kg(-1) x min(-1); mean +/- s) performed two bouts of 6 min duration at an intensity of 90% VO2max interspersed by 8 min of active recovery. Gas exchange and blood data (pH, blood lactate concentration and [HCO3-]) were collected during the tests. In both bouts, the slow component of VO2 was defined as the difference between end-exercise VO2 and the VO2 at the end of the third minute. No significant difference was found in the slow component of VO2 between conditions in the first (NaHCO3, 210 +/- 69 ml; placebo, 239 +/- 105 ml) or second trial (NaHCO3, 123 +/- 88 ml; placebo, 197 +/- 101 ml). In conclusion, pre-exercise NaHCO3 ingestion did not significantly attenuate the VO2 slow component of professional road cyclists during high-intensity exercise.
Santalla
Alfredo
A
Universidad Alfonso X El Sabio, Villanueva de la Cañada, Madrid, Spain.
Pérez
Margarita
M
Montilla
Manuel
M
Vicente
Lázaro
L
Davison
Richard
R
Earnest
Conrad
C
Lucía
Alejandro
A
D000136:Acid-Base Equilibrium / Q000187:drug effects / Q000502:physiology; D000328:Adult; D000471:Alkalosis / Q000097:blood / Q000139:chemically induced / Q000378:metabolism*; D000704:Analysis of Variance; D001642:Bicycling / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010101:Oxygen Consumption / Q000187:drug effects* / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology*; D011659:Pulmonary Gas Exchange / Q000187:drug effects / Q000502:physiology; D017693:Sodium Bicarbonate / Q000493:pharmacokinetics*
D019344:Lactic Acid; D017693:Sodium Bicarbonate