title: Acute and chronic loading of sodium bicarbonate in highly trained swimmers.
abstract: In the present study, 200-m swim time in highly trained male swimmers was measured on two consecutive days (Trial 1 and Trial 2) and under three conditions [(1) acute loading, AcL; (2) chronic loading, ChL; (3) Placebo, PLA]. No sodium bicarbonate (NaHCO(3)) was administered between Trial 1 and Trial 2 under each condition. Blood lactate concentration ([La(-)]), base excess of extracellular fluid (BE(ecf)), plasma bicarbonate concentration ([HCO(3) (-)]) and pH were determined before and after capsule administration as well as at 0, 3, 5, 15 and 30 min after each 200-m swim trial. Swim time was not different among AcL, ChL or PLA for Trial 1 or 2 and we observed no change in 200-m swim time from Trial 1 to 2 under any condition (F = 0.48, P = 0.80). [HCO(3) (-)], pH and BE(ecf) measured after capsule administration was higher during AcL and ChL when compared with PLA (P < 0.05). We did not observe any difference in blood [La(-)] between the three conditions at any stage post-exercise (P > 0.05). The results indicate that acute and chronic loading of NaHCO(3) does not improve 200-m swim time in highly trained male swimmers.
authors.affiliation: School of Physiotherapy and Exercise Science, Griffith University, Gold Coast Campus, Gold Coast, QLD 4222, Australia.
authors.forename: Sarah
authors.initials: S
authors.lastname: Joyce
authors.forename: Clare
authors.initials: C
authors.lastname: Minahan
authors.forename: Megan
authors.initials: M
authors.lastname: Anderson
authors.forename: Mark
authors.initials: M
authors.lastname: Osborne
mesh_terms: D000284:Administration, Oral; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008297:Male; D005082:Physical Exertion / Q000187:drug effects* / Q000502:physiology*; D017693:Sodium Bicarbonate / Q000008:administration & dosage*; D013550:Swimming / Q000502:physiology*; D013647:Task Performance and Analysis; D055815:Young Adult
chemical_list: D017693:Sodium Bicarbonate