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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
The Journal of Sports Medicine and Physical Fitness 2001 December;41(4):456-62
Acute versus chronic sodium bicarbonate ingestion and anaerobic work and power output
Mc Naughton L., Thompson D.
From the Department of Sport and Exercise Science University of Bath, Bath, England
Background. The aim of this study was to compare and contrast the effects of acute versus chronic sodium bicarbonate ingestion.
Methods. Participants: eight male, (mean±SE): age, 20.8±0.4 yrs; height, 179.6±0.6 cm; body mass, 79.4±0.85 kg, Σ7skf, 48.6±4.8 mm, V.O2max=55.9±0.8 ml·kg-1·min-1) volunteer subjects, ingested NaHCO3 in either a dose of 0.5 g·kg-1 body mass acutely or the same dose daily over a period of six days in order to determine whether there were any differences in performance of 90 sec maximal cycling ergometry. Intervention: after subjects undertook an initial control (C) test session, all were then randomly assigned to one of two groups, acute or chronic NaHCO3 ingestion. Subjects in the acute ingestion (AI) group completed their supplemented test on day one, and then on the following day. Chronic ingestion (CI) subjects completed the test after one day of chronic ingestion as well as following six days of bicarbonate ingestion. Following ten days rest, subjects repeated the protocol in the opposite group. Measures: blood samples were taken pre- and postingestion, daily, and pre- and postexercise and were analysed for, pH, Base excess (BE), HCO3-, PO2, PCO2, Na+, K+, Cl-, and lactate.
Results. Both the chronic (CI) and acute ingestion (AI) groups were significantly different to the control (C) value (p<0.001 and p<0.05, respectively).
Conclusions. We would suggest using chronic ingestion as a means to improve high intensity work rather than the acute ingestion of sodium bicarbonate. The ingestion of sodium bicarbonate, over a period of six days, significantly improved work output two days after bicarbonate ingestion ceased.