title: The effects of sodium bicarbonate (NaHCO3) ingestion on high intensity cycling capacity.
abstract: Ten healthy, non-cycling trained males (age: 21.2 ± 2.2 years, body mass: 75.9 ± 13.4 kg, height: 178 ± 6 cm, [Vdot]O2PEAK: 46 ± 10 ml · kg(-1) · min(-1)) performed a graded incremental exercise test, two familiarisation trials and six experimental trials. Experimental trials consisted of cycling to volitional exhaustion at 100%, 110% and 120% WPEAK, 60 min after ingesting either 0.3 g · kg(-1) body mass sodium bicarbonate (NaHCO3) or 0.1 g · kg(-1) body mass sodium chloride (placebo). NaHCO3 ingestion increased cycling capacity by 17% at 100% WPEAK (327 vs. 383 s; P = 0.02) although not at 110% WPEAK (249 vs. 254 s; P = 0.66) or 120% WPEAK (170 vs. 175 s; P = 0.60; placebo and NaHCO3 respectively). Heart rate (P = 0.02), blood lactate (P = 0.001), pH (P < 0.001), [HCO3 (-)], (P < 0.001), and base excess (P < 0.001) were greater in all NaHCO3 trials. NaHCO3 attenuated localised ratings of perceived exertion (RPEL) to a greater extent than placebo only at 100% WPEAK (P < 0.02). Ratings of abdominal discomfort and gut fullness were mild but higher for NaHCO3. NaHCO3 ingestion significantly improves continuous constant load cycling at 100% WPEAK due to, in part, attenuation of RPEL.
authors: Coventry University, Biomolecular and Sports Science, James Starley Building, Cox St, Coventry, CV15FG, United Kingdom. higgin27@uni.coventry.ac.uk
authors: Matthew F
authors: MF
authors: Higgins
authors: Rob S
authors: RS
authors: James
authors: Mike J
authors: MJ
authors: Price
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010101:Oxygen Consumption / Q000187:drug effects; D010807:Physical Endurance / Q000187:drug effects* / Q000502:physiology; D005082:Physical Exertion / Q000187:drug effects; D012123:Pulmonary Ventilation / Q000187:drug effects; D017693:Sodium Bicarbonate / Q000494:pharmacology*; D055815:Young Adult
chemical_list: D019344:Lactic Acid; D017693:Sodium Bicarbonate