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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
EXCERCISE PHYSIOLOGY AND BIOMECHANICS
Do Valle Bargieri J. 1, Berton D. C. 2, Aparecido De Almeida A. 1, Asprón Garcia F. 1, Carlos Da Silva A. 1, Alberto Neder J. 3, Andrade M. S. 1
1 Department of Exercise Physiology, Federal University of São Paulo (UNIFESP), São Paulo, Brasil;
2 Federal University of Rio Grande do Sul Porto Alegre, RS, Brasil;
3 Division of Respiratory and Critical Care, Federal University of São Paulo (UNIFESP) , São Paulo, Brasil
Aim: Decrease in peripheral oxygen delivery may impact exercise performance in athletes with exercise-related arterial oxygen desaturation (ERD). We evaluated whether sodium bicarbonate ingestion would be effective to reduce ERD and what is the consequences upon exercise performance.
Methods: Seventy highly trained athletes performed an incremental treadmill cardiopulmonary exercise test (incCPX) and a high intensity constant speed test (ctCPX) on separate days. Subjects who developed ERD by pulse oximetry were randomly allocated to oral sodium bicarbonate or placebo during 5 days. At the end of treatment subjects repeated both tests.
Results: ERD prevalence was 33% during the incCPX (17 % severe, 48% moderate and 35% mild) and 34% (5 % severe, 37% moderate and 58% mild) in the ctCPX. Athletes who developed ERD have greater aerobic capacity (incCPX) and endurance time (ctCPX). Active treatment, but not placebo, reduced ERD during ctCPX (P<0.05). However, there were no significant positive effects on main parameters of aerobic function and endurance exercise capacity (P>0.05).
Conclusion: Sodium bicarbonate was effective in lessening ERD during ctCPX in athletes. However, this intervention failed to improve maximal and submaximal exercise capacity in these subjects.