A mioglobina: oferta de oxigênio no músculo
DOI:
https://doi.org/10.33233/rbfe.v10i4.3453Abstract
O pico de VO2 ou VO2max é definido como a capacidade máxima de utilizar o oxigênio, mesmo no aumento da potência, sendo um parâmetro utilizado para medir a capacidade física, mas que ainda apresenta aspectos duvidosos em relação às variáveis que podem contribuir para sua manifestação. O VO2max é limitado pelo sistema de transportes de oxigênio, por fatores centrais e periféricos. O fator central preponderante é a capacidade cardíaca, já em termos periféricos o VO2max é limitado pela oferta de O2 nos músculos e não pela capacidade mitocondrial. A mioglobina é uma proteína responsável pelo transporte e armazenamento de oxigênio dentro dos músculos, maximizando a captação do mesmo para as células. O músculo é dependente da associação entre O2 e mioglobina para atingir valores de captação máxima durante o exercício. A escolha da mioglobina como tema principal deve-se a pouca discussão da sua importância dentro de um tema bastante explorado e sua ligação com o VO2max. Assim, esta revisão focará a mioglobina que parece limitar o VO2max. Concluiu-se que não há durante o exercício déficit de oxigênio nos músculos, há, sim, uma limitação ao transporte via mioglobina e que esta facilita o transporte de oxigênio na célula quando há redução da concentração intracelular de oxigênio.
Palavras-chave: mioglobina, músculo, oxigênio.
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