Effects of -alanine and sodium bicarbonate supplementation on the estimated energy system contribution during high-intensity intermittent exercise

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art_SILVA_Effects_of_alanine_and_sodium_bicarbonate_supplementation_on_2019.PDF (1.34 MB)
Citações na Scopus
27
Tipo de produção
article
Data de publicação
2019
DOI
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Editora
SPRINGER WIEN
Autores
OLIVEIRA, Luana Farias de
PAINELLI, Vitor de Salles
MARINS, Joao Carlos Bouzas
FRANCHINI, Emerson
ARTIOLI, Guilherme Giannini
Citação
AMINO ACIDS, v.51, n.1, p.83-96, 2019
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
The effects of -alanine (BA) and sodium bicarbonate (SB) on energy metabolism during work-matched high-intensity exercise and cycling time-trial performance were examined in 71 male cyclists. They were randomised to receive BA+placebo (BA, n=18), placebo+SB (SB, n=17), BA+SB (BASB, n=19), or placebo+placebo (PLA, n=18). BA was supplemented for 28days (6.4gday(-1)) and SB (0.3gkg(-1)) ingested 60min before exercise on the post-supplementation trial. Dextrose and calcium carbonate were placebos for BA and SB, respectively. Before (PRE) and after (POST) supplementation, participants performed a high-intensity intermittent cycling test (HICT-110%) consisting of four 60-s bouts at 110% of their maximal power output (60-s rest between bouts). The estimated contribution of the energy systems was calculated for each bout in 39 of the participants (BA: n=9; SB: n=10; BASB: n=10, PLA: n=10). Ten minutes after HICT-110%, cycling performance was determined in a 30-kJ time-trial test in all participants. Both groups receiving SB increased estimated glycolytic contribution in the overall HICT-110%, which approached significance (SB: +23%, p=0.068 vs. PRE; BASB: +18%, p=0.059 vs. PRE). No effects of supplementation were observed for the estimated oxidative and ATP-PCr systems. Time to complete 30 kJ was not significantly changed by any of the treatments, although a trend toward significance was shown in the BASB group (p=0.06). We conclude that SB, but not BA, increases the estimated glycolytic contribution to high-intensity intermittent exercise when total work done is controlled and that BA and SB, either alone or in combination, do not improve short-duration cycling time-trial performance.
Palavras-chave
Metabolism, Buffering, Performance, Acidosis, Cycling
URI
https://observatorio.fm.usp.br/handle/OPI/31104
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MCM
Artigos e Materiais de Revistas Científicas - LIM/17