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Revista do Colégio Brasileiro de Cirurgiões

Print version ISSN 0100-6991

Rev. Col. Bras. Cir. vol.25 no.1 Rio de Janeiro Feb. 1998

http://dx.doi.org/10.1590/S0100-69911998000100007 

ARTIGOS ORIGINAIS

 

Avaliação do fluxo arterial mesentérico em humanos durante o exercício

 

Mesenteric artery blood flow avaliation in humans during exercice

 

 

Adamastor Humberto Pereira, TCBC-RSI; Júlio Lewis Nectoux FilhoII; Emil BurihanIII; Jorge Pinto RibeiroIV; Marcos Braun BurgerV; Sérgio Ricardo Araújo de MoraesV

IProfessor Adjunto do Departamento de Cirurgia da Faculdade de Medicina da UFRGS. Chefe do Serviço de Cirurgia Vascular do Hospital de Clínicas de Porto Alegre
IIMédico do Serviço de Cirurgia Vascular do Hospital de Clínicas de Porto Alegre
IIIProfessor Titular do Departamento de Cirurgia da Faculdade de Medicina da EPM. Chefe do Serviço de Cirurgia Vascular da EPM
IVProfessor Adjunto do Departamento de Medicina Interna da Faculdade de Medicina da UFRGS
VDoutorando da Faculdade de Medicina da UFRGS

Endereço para correspondência

 

 


RESUMO

O aumento da atividade simpática durante o exercício dinâmico progressivo associa-se à resposta da concentração de lactato sangüíneo. Com o objetivo de testar a hipótese de que a diminuição do fluxo da artéria mesentérica superior também tenha relação com a lactiacidemia, oito indivíduos saudáveis (idade de 21-26 anos) foram submetidos a exercício com incremento progressivo de cargas ajustadas para os limiares de lactato, sendo o fluxo da artéria mesentérica superior medido pelo EcoDoppler. O fluxo na artéria mesentérica superior, calculado por medidas planimétricas das velocidades e medidas da área de secção, foi avaliado em repouso, após carga de 30 Watts, no primeiro e segundo limiares de lactato e esforço máximo, O fluxo (média ± EP) no repouso foi de 1.034 ± 112 ml/min, de 1.002 ± 124 na carga de 30 Watts, de 869 ± 122 ml/min no primeiro limiar de lactato, de 866 ± 127 ml/min no segundo limiar de lactato e de 689 ± 104 ml/min logo após o esforço máximo, Ocorreu uma redução linear, sendo a redução média na carga máxima de 34% do fluxo de repouso, não havendo correlação com os limiares de lactato. Portanto, a redução do fluxo da artéria mesentérica superior apresenta uma resposta linear ao exercício progressivo.

Unitermos: EcoDoppler; Limiar aeróbico; Artéria mesentérica superior; Isquemia mesentérica.


ABSTRACT

Mesenteric artery blood flow was measured by Doppler ultrasound in eight healthy subjects (age 21-26 years, mean=25.8) submitted to incremental exercise. As cardiovascular responses change above the point at which blood lactate starts to accumulate, a protocol was designed to determine the velocity profile and mesenteric artery flow redistribution along incremental exercise. On the first part of the protocol all individuals were submitted to determinations of lactate thresholds by the enzimatic method modified by Ribeiro et al (1986). On the second test mesenteric artery blood flow and sistolic, reverse and diastolic velocities were measured at rest and immediately after 30 Watts, first lactate threshold, second lactate threshold and at peak exercise. In this way exercise intensities were adjusted for each individual independently of training and physical conditions. Total mesenteric artery blood flow was calculated using planimetric measurement of the velocities waves and area determinations. The Friedman test was used to analise de data. There was no significant change of sistolic velocities during incremental exercise. In the other hand there was a marked decrease of diastolic velocities; a linear decrease of initial diastolic velocities and an abrupt decrease of end-diastolic velocities after the first lactate threshold. At peak exercise a redution of 77% in end-diastolic velocities was observed. A linear reduction of mesenteric artery blood flow was observed and there was no correlation with lactate thresholds; at peak exercise a decrease of 34% was detected. Resting mesenteric blood flow was 1.034± 112 (SE), at 30 Watts 1.002± 124 (SE), at the first lactate threshold 869± 122 (SE), at the second lactate threshold 866± 127 (SE) and at peak exercise 689± 104 (SE).

Key words: Doppler ultrasound; Anaerobic threshold; Superior mesenteric artery; Mesenteric ischemie.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

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Endereço para correspondência:
Prof. Adamastor Humberto Pereira
Hospital de Clínicas de Porto Alegre
Serviço de Cir. Geral e Especialidades-Cir. Vascular
Rua Ramiro Barcelos 2350 - 60 andar
90035-007 - Porto Alegre - RS

Recebido em 9/6/97
Aceito para publicação em 15/9/97

 

 

Trabalho realizado nos Serviços de Cirurgia Vascular e Cardiologia do Hospital de Clínicas de Porto Alegre; Faculdade de Medicina, Universidade Federal do Rio Grande do Sul- Porto Alegre - RS.

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