title: Sodium bicarbonate ingestion and individual variability in time-to-peak pH.
abstract: This study determined variability in time-to-peak pH after consumption of 300 mg kg-1of sodium bicarbonate. Seventeen participants (mean ± SD: age 21.38 ± 1.5 years; mass 75.8 ± 5.8 kg; height 176.8 ± 7.6 cm) reported to the laboratory where a resting capillary sample was taken. Then, 300 mg kg-1of NaHCO3in 450 ml of flavoured water was ingested. Participants rested for 90 min and repeated blood samples were procured at 10 min intervals for 60 min and then every 5 min until 90 min. Blood pH concentrations were measured. Results suggested that time-to-peak pH (64.41 ± 18.78 min) was variable with a range of 10-85 min and a coefficient of variation of 29.16%. A bimodal distribution occurred, at 65 and 75 min. In conclusion, athletes, when using NaHCO3as an ergogenic aid, should determine their time-to-peak pH to best utilize the added buffering capacity this substance allows.
authors.affiliation: a Department of Sport and Physical Activity , Edge Hill University Exercise Nutrition Research Group, Edge Hill University , Ormskirk , UK.
authors.forename: Andy
authors.initials: A
authors.lastname: Sparks
authors.affiliation: a Department of Sport and Physical Activity , Edge Hill University Exercise Nutrition Research Group, Edge Hill University , Ormskirk , UK.
authors.forename: Emily
authors.initials: E
authors.lastname: Williams
authors.affiliation: a Department of Sport and Physical Activity , Edge Hill University Exercise Nutrition Research Group, Edge Hill University , Ormskirk , UK.
authors.forename: Amy
authors.initials: A
authors.lastname: Robinson
authors.affiliation: a Department of Sport and Physical Activity , Edge Hill University Exercise Nutrition Research Group, Edge Hill University , Ormskirk , UK.
authors.forename: Peter
authors.initials: P
authors.lastname: Miller
authors.affiliation: b Flinders University, Faculty of Medicine, Nursing and Health Sciences , School of Health Sciences , Adelaide , South Australia , Australia.
authors.forename: David J
authors.initials: DJ
authors.lastname: Bentley
authors.affiliation: a Department of Sport and Physical Activity , Edge Hill University Exercise Nutrition Research Group, Edge Hill University , Ormskirk , UK.
authors.forename: Craig
authors.initials: C
authors.lastname: Bridge
authors.affiliation: a Department of Sport and Physical Activity , Edge Hill University Exercise Nutrition Research Group, Edge Hill University , Ormskirk , UK.
authors.forename: Lars R
authors.initials: LR
authors.lastname: Mc Naughton
mesh_terms: D000136:Acid-Base Equilibrium / Q000187:drug effects* / Q000502:physiology; D000138:Acidosis / Q000097:blood / Q000517:prevention & control*; D000284:Administration, Oral; D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D002021:Buffers; D006801:Humans; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D008297:Male; D058573:Performance-Enhancing Substances / Q000494:pharmacology* / Q000627:therapeutic use; D017693:Sodium Bicarbonate / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: D002021:Buffers; D058573:Performance-Enhancing Substances; D017693:Sodium Bicarbonate
keywords: Performance; acidity; buffering; individual response