title: Sodium citrate ingestion enhances 30 km cycling performance.
abstract: The purpose of this study was to examine the effects of sodium citrate (CIT) ingestion on 30 km cycling performance. Eight trained male cyclists (VO2max = 54.7 +/- 1.7 ml.kg-1.min-1) performed two 30 km cycling time trials. The trials were double blind and randomly assigned from CIT or placebo (PLC), with both dosages at 0.5 g.kg body wt-1. Blood samples were collected from an indwelling catheter at 10 km intervals and analyzed for PO2, PCO2, pH, and lactate concentration ([La]). Power output, heart rate (HR) and RPE were measured at 5 min intervals during the trials, while cycling performance was determined from time to complete the 30 km. A repeated measures ANOVA and dependent t-tests were used to locate differences between the trials. A significant difference (p < or = 0.01) was observed for pH and [La] during the trials with CIT being elevated above PLC throughout the ride. No significant differences (p > 0.01) were observed for any of the other dependent variables. However, power output and HR were slightly elevated during the CIT trial. Performance time was significantly faster (p < or = 0.05) for the CIT trial (3459.6 +/- 97.4 s) compared to the PLC trial (3562.3 +/- 108.5 s). The data indicate that favorable metabolic conditions were obtained following CIT ingestion and these likely contributed to the improvement in cycling performance.
authors.affiliation: Exercise Physiology Laboratory, University of Kansas, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Potteiger
authors.forename: G L
authors.initials: GL
authors.lastname: Nickel
authors.forename: M J
authors.initials: MJ
authors.lastname: Webster
authors.forename: M D
authors.initials: MD
authors.lastname: Haub
authors.forename: R J
authors.initials: RJ
authors.lastname: Palmer
mesh_terms: D000328:Adult; D000863:Antacids / Q000494:pharmacology*; D001642:Bicycling / Q000502:physiology*; D002951:Citrates / Q000494:pharmacology*; D004311:Double-Blind Method; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D000077559:Sodium Citrate
chemical_list: D000863:Antacids; D002951:Citrates; D000077559:Sodium Citrate; D019344:Lactic Acid