Comparação de diferentes frequências da estimulação diafragmática elétrica transcutânea em indivíduos saudáveis: ensaio clínico randomizado cruzado
DOI:
https://doi.org/10.11606/issn.2317-0190.v29i1a186736Palavras-chave:
Estimulação Elétrica, Diafragma, Força Muscular, Voluntários SaudáveisResumo
A maioria dos estudos utilizam a estimulação diafragmática elétrica transcutânea (EDET) com frequência (F) de estímulo de 30Hz e testar diferentes frequências torna-se necessário para uma aplicação otimizada. Objetivo: Foi comparar o efeito agudo de duas frequências diferentes da EDET sobre a força muscular respiratória e endurance, ativação diafragmática, espessura muscular e mobilidade diafragmática, variáveis cardiovasculares e segurança em indivíduos saudáveis. Métodos: Estudo randomizado cruzado com 20 indivíduos saudáveis submetidos a duas intervenções: Grupo I com F= 30Hz e Grupo II com F= 80Hz. A aplicação foi nos pontos motores do diafragma, com duração do pulso de 500µs, durante 30 minutos. Foram avaliados a pressão arterial sistólica (PAS) e diastólica (PAD), frequência cardíaca (FC), força muscular respiratória pela pressão inspiratória máxima (PImax), pressão expiratória máxima (PEmax), endurance e espessura muscular em inspiração (EDI) e expiração (EDE), mobilidade e ativação diafragmática. Resultados: O GI apresentou redução significativa em comparação às condições basais para os desfechos de PAS (p= 0.04), FC (p<0.001), EDI (p= 0,02), PIF (p= 0.01), e S-Index (p= 0.03). O GII apresentou redução significativa em comparação às condições basais para FC (p<0.001) e aumento da PEmax (p<0.001). Porém, estas alterações não foram clinicamente importantes e não houve diferença entre os grupos para nenhum desfecho avaliado. Nenhuma intercorrência foi observada. Conclusão: A EDET com F-80Hz produz efeitos semelhantes a F-30Hz em indivíduos saudáveis e ambas as frequências provaram ser seguras (NCT03844711).
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