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The effects of sodium bicarbonate (NaHCO3) ingestion on high intensity cycling capacity

Higgins, M., James, R. S. and Price, M. (2013) The effects of sodium bicarbonate (NaHCO3) ingestion on high intensity cycling capacity. Journal of Sports Sciences. 31(9), pp. 972-981. 0264-0414.

Item Type: Article
Abstract: Ten healthy, non-cycling trained males (age: 21.2+2.2 years, body mass: 75.9+13.4 kg, height: 178+6 cm, _V 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, 60min 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.
Uncontrolled Keywords: Ergogenic aids, alkalosis, metabolic buffers, pH, RPE
Subjects: Q Science > QP Physiology > QP301 Exercise and sports physiology
G Geography. Anthropology. Recreation > GV Recreation. Leisure > GV1040 Cycling. Bicycling. Motorcycling
Creators: Higgins, Matthew, James, R S and Price, M
Publisher: Taylor & Francis
Northamptonshire and East Midlands: Health
Faculties, Divisions and Institutes: University Faculties, Divisions and Research Centres - OLD > Faculty of Health & Society
Date: 2013
Date Type: Publication
Page Range: pp. 972-981
Journal or Publication Title: Journal of Sports Sciences
Volume: 31
Number: 9
Language: English
ISSN: 0264-0414
Status: Published / Disseminated
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