Lower limb musculoskeletal biomechanics in patients with chronic obstructive pulmonary disease
Biomecânica musculoesquelética de membros inferiores em pacientes com doença pulmonar obstrutiva crônica
Fernando Aguiar Lemos, Raquel Oliveira Lupion, Marco Aurélio Vaz, Marli Maria Knorst, Alexandre Simões Dias
Abstract
Introduction: The lower limb peripheral muscle dysfunction in patients with chronic obstructive pulmonary disease (COPD) has been considered one of the main limiting factors of physical exercise. Several biomechanical techniques have been used to identify intrinsic and extrinsic muscular tissue characteristics in response to different types of acute and/or chronic physical stress. This study aimed at identifying the most discussed issues in the specific literature related to peripheral muscle dysfunction in COPD. Methodology: A digital search was conducted in the following databases: Periódicos CAPES, PubMed and Medline. Results: Three main themes were identified: 1) morphological metabolic muscle changes in COPD; 2) skeletal muscle mechanical properties in COPD; 3) the effect of acute and chronic exercise in patients with COPD. A total of thirty-two medical journals in the areas of pneumology, biomechanics, surgery and sports medicine were reviewed. Discussion: Changes resulting from muscle dysfunction reduced both force production capacity and resistance to fatigue, leading COPD patients to lower tolerance to exercise. The abnormal inflammatory response contributed to the occurrence of oxidative stress and to decreased formation of antioxidant agents. These factors limit muscle metabolism and decrease both the tissue’s structure and function. Conclusion: Higher levels of hypoxemia and inflammation determined lower force capacity and muscle resistance in patients with COPD, which is not observed in subjects with preserved muscle mass.
Keywords
Resumo
Introdução: A disfunção muscular periférica de membros inferiores em pacientes com doença pulmonar obstrutiva crônica (DPOC) tem sido considerada um dos principais fatores limitantes do exercício físico. Diversas técnicas biomecânicas são utilizadas para identificar, em diferentes faixas etárias, sexos e níveis de doenças características extrínsecas e intrínsecas do tecido muscular em resposta ao estresse físico agudo e/ou crônico. Desta forma, este trabalho tem o objetivo de identificar os temas mais abordados pela literatura, em relação à disfunção muscular periférica na DPOC. Metodologia: Para a realização deste estudo, foi realizada pesquisa digital no Portal de Periódicos Capes, Pub Med e Medline. Resultados: Três principais temas foram identificados: 1) alterações morfológicas musculares na DPOC; 2) propriedades mecânicas musculares na DPOC; 3) Efeito do exercício agudo e crônico na disfunção muscular periférica de membros inferiores em pacientes com DPOC. Um total de 32 revistas voltadas a áreas médicas como pneumologia, biomecânica, cirurgia e medicina do esporte foram consultadas. Discussão: Alterações decorrentes da disfunção muscular reduzem a capacidade de produção de força e resistência à fadiga, o que leva indivíduos com DPOC a apresentarem menor tolerância ao exercício. Ainda é possível observar uma resposta inflamatória anormal, o que pode aumentar o estresse oxidativo e prejudicar a formação de agentes antioxidantes. Todas estas situações limitam o metabolismo muscular e alteram a estrutura e a função deste tecido. Conclusão: Foi possível observar que altos níveis de hipoxemia e inflamação reduzem a capacidade de força e resistência muscular. Este fato não é observado em indivíduos com a massa muscular preservada.
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Referências
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