O uso abusivo de esteroides anabolizantes está associado à disfunção do sistema nervoso autônomo
Resumo
O objetivo deste estudo foi avaliar se o uso de esteroides androgênicos anabolizantes (AAS) pode induzir disfunção autonômica cardíaca em indivíduos treinados após uma sessão de exercício. Utilizando um delineamento quase-experimental, 17 homens saudáveis foram divididos em dois grupos: usuários de AAS (n=7), que relataram autoadministração por pelo menos dois anos, e não usuários de AAS (n=10). Todos os participantes realizaram uma sessão aguda de treinamento de força composta por três séries de 10 repetições a 70% de 1RM, em quatro exercícios (supino reto, leg press, remada sentada e extensão de pernas), com intervalo de 60 segundos entre as séries. As medições de variabilidade da frequência cardíaca (HRV) foram feitas antes, imediatamente após e durante um período de recuperação de 60 minutos após o exercício. Os resultados mostraram que os usuários de AAS apresentaram valores mais baixos para o desvio padrão dos intervalos NN e diferenças quadráticas médias sucessivas em comparação com os não usuários de AAS antes do exercício resistido. No entanto, imediatamente após o treino, todos os índices no domínio do tempo, análise não linear e análise simbólica foram semelhantes entre usuários e não usuários. Concluímos que o uso de AAS está associado a uma disfunção do sistema autonômico.
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